Electronic Circuit Schematic Wiring Diagram

TDA1562Q Audio Power Amplifier 36 Watt

2012-01-24T06:58:00.000-08:00

The TDA1562Q Audio Power Amplifier 36 Watt based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really pack a punch - around 36W RMS continuous into a 4-ohm load when using a 13.8V supply. However, it's the 70W of output power that it can deliver during dynamic (music) signal conditions that really

Integrator Using Op amp 741 Circuit

2011-07-01T17:23:00.000-07:00

Integrator Using Op amp 741 Circuit An integrator is a circuit which shows the sum of input voltage at the output. That means it works by the operation of integral form. If we see the output of the integrator shows the summation of input voltages, the result of integrator circuit will be right. Such that, if we give square wave at the input, then we will get triangular wave at the output. A

PIC16F684 Digital Ammeter

2011-07-01T17:20:00.000-07:00

PIC16F684 Digital Ammeter The bellow circuit is digital Ammeter based on PIC16F684 and ACS712 current sensor. Here the measured ac/dc current will display on three digit 7-segment with resolution 100mA. In this project current sensor is ACS712ELCTR-30A-T . This circuit can measure the ac or dc current up to 30mA with 66mV/A output sensitivity. The micro-controller PIC16F684 is used to read

BC548 Heat Sensor Circuit

2011-07-01T17:17:00.000-07:00

BC548 Heat Sensor Circuit Heat sensor circuit can be used to control any device using heat sensor. In this circuit a thermistor and a resistance is connected in series. This arrangement makes a potential divider circuit. Here the thermistor is Negative Temperature Coefficient type. So when the room temperature is increased its resistance decreases simultaneously and more current flows through the

NE 555 & LM 567 Remote Control Circuit

2011-06-20T09:30:00.000-07:00

Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit’s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency which is emitted by that transmitter circuit. Transmitted signal frequency must be equal to the frequency decoder of the receiver circuit.

DIY Sound Activated Lights Circuit Diagram

2011-06-19T16:12:00.000-07:00

DIY Sound Activated Lights Circuit Diagram This diy sound activated lights circuit turns a lamp ON for a brief length when the canine barks (or a somewhat strong sound) providing an impression that the occupants happen to be alerted. The condenser microphone fitted in a place to watch sound and generates AC signals, which pass by means of DC blocking capacitor C1 for the base of transistor BC549

ATX POWER SUPPLY PINOUT

2011-06-06T15:33:00.000-07:00

Computer power supply units (PSU) deliver the power to the PC hardware via a number of cables with connectors. The generic specifications for various PSU form factors intended for use with desktop systems are defined in Intel's design guides, which are periodically revised. The latest standard is Design Guide rev.1.1 released on March 2007, which combines the requirements for CFX12V, LFX12V,

FM WIRELESS MICROPHONE CIRCUIT

2011-06-05T16:25:00.000-07:00

FM WIRELESS MICROPHONE CIRCUIT DIAGRAM This FM Wireless Microphone has long been an extremely favorite undertaking with newcomers and experienced constructors alike. It has been utilised within guitars and as the foundation of the remote control process. I do even so, get numerous requests for a greater driven circuit and much better microphone sensitivity. This Substantial Electrical power FM

GSM CELL PHONE JAMMER SCHEMATIC

2011-06-05T16:15:00.000-07:00

GSM CELL PHONE JAMMER CIRCUIT SCHEMATIC A wonderful diy gsm jammer or cellular mobile phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 cellular cell phone network is made use of by USA, Canada and most of the nations in South America. This cellular phone jammer isn't applicable for use in Europe, Center East, nor Asia. The GSM jammer

LM3886 Power Amplifier 68W

2011-06-05T16:09:00.000-07:00

68W Power Amplifier with LM3886 circuit diagram The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4 load and 38W into 8 with 0.1% THD+N from 20Hz-20kHz. features: Maximum Output Power : 68W RMS - 108W Peak THD : %0.03 at 60W SNR : 110dB at 60 W - 92.5dB at 1W PSRR : 120dB

uninterrupted power supply circuit diagram

2011-05-28T17:03:00.000-07:00

uninterrupted power supply circuit diagram SchematicThe circuit drawn pertains to a regular industrial UPS (Uninterruptible Energy Provide), which reveals how the batteries get control during an outage in electrical supply or variation beyond the typical limits of the voltage line, without disruption around the operation providing a constant regulated output (5 Volts by LM7805) and an unregulated

Mosfet Audio Amplifier 20W

2011-05-28T16:39:00.000-07:00

Mosfet Audio amplifier 20W schematicThis audio power amplifier makes use of two complementary MOSFETs (IRF9520 and IRF520) to supply up to 20W into eight O speaker. A TL071 op amp is utilized as an input amplifier. The MOSFETs should certainly be heatsinked having a heatsink of far better than 50C/W capability. THD is less than 0.15% from 100Hz to 10KHz.

Graphic Equalizer Schematic 10 band Mono

2011-05-28T16:32:00.000-07:00

Graphic Equalizer SchematicThis really is ten band graphic equalizer for 1 channel (mono) audio program. You will need build 2 similiar circuits for 2 channel (stereo) audio method. This equalizer construct depending on TL074 low sound JFET op-amp that will give you top quality audio output.Graphic Equalizer Schematic 10 band Mono Part List:

7-MHz Loop Antenna

2011-04-24T17:13:00.000-07:00

The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles towards the airplane in the loop, or in much more hassle-free terms, broadside through the loop. One need to try to hang the program from on the

Bent Dipole Antenna

2011-04-24T17:00:00.000-07:00

The easiest way to shorten a dipole is proven in Fig . In the event you don't have sufficient duration between the supports, just hang as much of the center from the antenna as possible among the supports and let the ends hang down. The ends might be directly down or could be at an angle as indicated but in either case must be secured so that they don't move inside the wind. So long as the center

NiMH Battery Charger Circuit

2011-04-24T16:55:00.000-07:00

NiMH Battery Charger CircuitNickel Metal Hydride battery that demands present regulated charging. The charger offers 140 mA current for quick charging of the battery.Power provide part consists of a 0-18 volt AC one Ampere step-down transformer, a full wave bridge rectifier comprising D1 through D4 along with the smoothing capacitor C1. Current regulation is accomplished from the action of R1,R2

300 Watt MOSFET Broadband Amplifier Using MRF141G

2011-03-11T20:08:00.000-08:00

The following segment will provide the enhanced Motorola schematic for any typical application for the MRF141G (which includes parasitic stabilization features), a broadband power RF MOSFET which will place out a conservatively-rated 300 watts across the FM broadcast band. The flange about the MRF141G ought to be mounted to a heat spreader, a copper plate 5/16" thick and 6" x 8", which is then

One KHz Synchronous Detector Circuit

2011-03-11T19:57:00.000-08:00

One KHz Synchronous Detector CircuitThis circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude with the 1 kHz signals when a 2nd at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or exhibit. An LED about the board also lights when the measured signal exceeds a preset threshold.This

Automated Digital Camera Shutter

2011-03-11T19:41:00.000-08:00

Automated Digital Camera ShutterIn 1984 I made a camera trigger to capture transient phenomena. I had a Mamiya ZE 35mm camera and Mamiyalite ZE flash unit. Common for bodies of its time, the only indicates of remotely triggering the camera was the cable release socket built into its shutter release button. This was meant to get employed having a purely mechanical cable; it allow you to operate

Honda Motorcycle CB750F Wiring Diagram

2010-12-02T13:49:00.001-08:00

Honda Motorcycle CB750F Wiring DiagramThe following picture shows the electrical wiring connection diagram for Honda Motorcycle CB750F. It shows the connection between Honda parts such as the right turn signal indicator light, oil pressure warning light, neutral indicator, high beam indicator, turn signal indicator, tachometer lights, speedometer lights, turn/signal running lights, headlight,

Honda Motorcycle CB400 (Hawk II) Wiring Diagram

2010-12-02T13:41:00.000-08:00

Honda Motorcycle CB400 (Hawk II) Wiring DiagramThe following picture shows the electrical wiring connection diagram for Honda Motorcycle CB400 (Hawk II). It shows the connection between Honda parts such as the turn signal, emergency stop switch, starter button, spark plug, capacitor discharge ignition unit, turn signal indicator, oil pressure warning light, neutral indicator, high beam warning

Microphone FM Transmitter Wireless Two Transistors Circuit

2010-12-02T13:37:00.000-08:00

Microphone FM Transmitter Wireless Two Transistors CircuitPlease be warned if operating this circuit might violate the regulation of your country, because this FM transmitter circuit radiate strong radio frequency to the environment. This wireless microphone is very sensitive, pick up every sound in the 20m radius, and transmit the radio signal up to 2 kilometers in open air. The first transistor

Logic Gates FM Transmitter Circuit

2010-12-02T13:35:00.000-08:00

Logic Gates FM Transmitter CircuitThis is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and inverter N2 to drive the parallel combination of N4 to N6 through N3. The output impedance will be low because these inverters are in parallel, so an aerial of 1/4h wavelength can be driven directly. There

Audible Logic Probe Circuit Schematic

2010-12-02T13:29:00.000-08:00

Audible Logic Probe Circuit Schematic DiagramNE556 timer can be used as an indicator of static of digital logic audible terminal. Audible logic probe is useful for inspecting a part visually while we also need to check the logic state on other point far from the part. NE556 acts as an oscillator controlled by (SN74132N) and IC2 (SN7486N). Any logic transition from 0 to 1 and vice versa will be

10V Switching Regulator Using LM5007

2010-11-22T01:47:00.000-08:00

10V Switching Regulator Using LM5007 Circuit DiagramDescription.The circuit diagram shown here is of a 10V switching regulator based on the LM5007 from National Semiconductors. The LM5007 is an integrated step down switching regulator which has all necessary systems required for making a cost effective and reliable switching regulator circuit. The IC is available in MSOP-8, LLp-8 packages and has

PCM2702 USB Sound Card Circuit

2010-11-22T01:39:00.000-08:00

PCM2702 USB Sound Card Circuit DiagramDesigning and architecture a USB complete agenda is no best a arch anguish because we accept got the PCM 2702 chip ambit from Texas Instruments. The PCM2702 is an chip 16 bit agenda to analog advocate that has two agenda to analog achievement channels. The chip interface ambassador of PCM2702 is adjustable to the USB 1.0 standards. The IC can handle

Simple Creative USB Circuit Lamp Design

2010-11-21T23:55:00.001-08:00

Simple USB Circuit Lamp DesignThis schematic atramentous and white blush architecture pictures is a simple USB powered lamp ambit diagram which can be acclimated to ablaze your PC (personal computer) during ability failures. The ambit diagram operates from the 5 Volt attainable from the desktop USB port. The 5Volt from the USB anchorage is anesthetized with absolute attached resistor R2

Low Cost Am Direct Coupled Radio Circuit Diagram

2010-11-21T23:51:00.000-08:00

Low Cost Am Radio Circuit DiagramThis afterward schematics ambit diagram of a ablaze absolute accompanying radio ideal for alert to adjacent stations. The electric ambit absolute accompanying radio diagram uses Q1 basic as a diode detector and aboriginal audio amplifier. The apprehension is angular the aboriginal emitter abject alliance which operates as a diode. The absolute accompanying

UA78G/UA79G Variable Power Supply Circuit Diagram

2010-11-21T23:36:00.000-08:00

UA78G/UA79G Variable Power Supply Circuit SchematicA abiding capricious ability accumulation with an adjustable achievement voltage from 5 volts to 30 volts can be calmly complete with the regulator ICs UA78G or UA79G. These ICs alter from the accepted three-terminal regulator back their achievement voltages are adjustable by a voltage akin at their ascendancy inputs. The best accepted delivered

LM723 Peak Level Indicator Circuit

2010-11-09T16:50:00.000-08:00

LM723 Peak Level Indicator CircuitThis circuit is a circuit diagram inspection signal sound level or Peak Level Indicator circuit using LM723. Usually we are often led IC LM723 or UA723 do come to use, the DC voltage regulator. But for this circuit, building a circuit can check the sound level signal. When I saw changes in the structure of integrated circuits. The following is a

LM56 Thermostat Project Circuit Diagram

2010-11-09T16:45:00.000-08:00

LM56 Thermostat Project CircuitThis electronic circuit thermostat using IC LM56 diagram which simple project you can use as reference guide. As you know, IC LM56 is especially accurate dual output low power thermostat characterize by National Semiconductors. 2 stable temperature trip points called VT1 and VT2 are made with dividing the IC LM56 1.250Volt internal voltage reference by three

Electronic FM Telephone Transmitter Circuit

2010-11-09T16:43:00.000-08:00

Electronic FM Telephone Transmitter SchematicThe following schematics design pictures is a circuit diagram FM telephone transmitter that built on a PC board layout which is so small it can simply be fitted within the housing of a telephone creating it an instant pseudo-speak earphone. This circuit diagram FM telephone transmitter components connects in series with telephone line, steals power

LOW-COST HEARING AID Schematic

2010-11-09T16:39:00.000-08:00

Skema Rangkaian LOW-COST HEARING AID SchematicCommercially available hearing aids are quite costly. Here is an inexpensive hearing aid circuit that uses just four transistors and a few passive components. On moving power switch S to ‘on’ position, the condenser microphone detects the sound signal, which is amplified by transistors T1 and T2. Now the amplified signal passes through coupling

Long Range FM Transmitter Circuit

2010-11-09T16:38:00.000-08:00

Long Range FM transmitter CircuitThe power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element Yagi antenna, this

LT1300 Solar Powered Power Supply

2010-11-09T16:35:00.000-08:00

LT1300 Solar Powered Power Supply CircuitThis architecture was generated as allotment of a alien acclimate base project. One of the requirements of the architecture is that it accept a solar-powered accumulation with rechargeable batteries. This architecture is based on a photovoltaic arrangement accessible from Radio Shack alleged a BatterySAVER (part cardinal 980-1045). It was advised

NE555 Rain Alarm Circuit

2010-11-09T16:26:00.000-08:00

NE555 Rain Alarm CircuitThis circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. The sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz.The sensor is also shown in the circuit diagram. It has to placed making an angle of about 30 - 45

LM35 Smart Heater Controller Project

2010-11-09T16:22:00.000-08:00

LM35 Smart Heater Controller SchematicMinuscule circuit of the electronic heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC. Besides, a popular BiMos Op-amp CA3140 (IC2) is used to sense the status of the temperature sensor IC1, which also controls a solid-state switch formed by a high power Triac BT136(T1). Resistive type

18 W TDA2030A Chip Hi-Fi Class AB Power Amplifier

2010-11-09T16:14:00.000-08:00

This chip amplifier NCH TDA2030A company ST Microelectronics enjoys well-deserved popularity among radio amateurs. It has a high electrical performance and low cost, which allows for the least cost to collect her high UNCH capacity of up to 18 Watts. But not everyone is aware of its hidden virtues: it turns out at the IMS can collect a number of other useful devices. TDA2030A chip is a 18 W

1.2GHz Voltage Controlled Oscillator With Linear Modulation

2010-08-29T16:22:00.000-07:00

1.2GHz Voltage Controlled Oscillator With Linear ModulationSince high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim (www.maxim-ic.com) has produced an integrated 1.2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency to be modulated. The IC is available in an 8-pin µMAX package,

Standard Tube Lamp Disco Light Strobo Circuit

2010-08-29T16:19:00.000-07:00

Strobo Disco Light CircuitUsing a standard fluorescent tube lamp (TL), you can make your own disco light, similar to a stroboscope light. You can even use a half-broken lamp, which one side of the heating filaments has broken. This circuit use only one side heating filament inside the tube. Look at the circuit’s schematic below. Please be aware that this circuit uses high voltage from your main

TDA2004 Stereo Car Radio Amplifier Circuit

2010-08-29T12:44:00.000-07:00

TDA2004 Stereo Car Radio Amplifier CircuitDescription:The TDA2004 is a class B dual audio power amplifier in MULTIWATT(R) package specifically designed for car radio applications. stereo amplifiers are easily designed using this device that provides a high current capability (up to 3.5A) and that can drive very low impedance loads (down to 1.6W )Features:Low distortion.Low noise.High reliability

Mini Operated Voice Relay Schematic

2010-08-29T12:33:00.000-07:00

Mini Operated Voice Relay SchematicComponent Parts list:R1, R7 1KR2, R4, R8 10KR3 2K2R5 1MR6 200KR9 39KD1, D4 1N4004D2, D3 1N4148C2, C5 2.2uF/16V mini ecap C1 10uF/16V mini ecapC4 100pFC3 100nFQ1 BC548IC1 LM358 (of Hitachi HA17358)8 pin IC socketRelay AX-SH-112LLED 3mmElectret microphoneThis mini-VOX – voice operated relay – is based on a circuit published in Silicon Chip, 9/1994, p31. The off

Inverter Fluorescent Lamp Schematic 40w

2010-08-29T12:01:00.000-07:00

This 40W fluorescent lamp inverter allows you to run 40W fluorescent tubes from any 12V source capable of delivering 3A. This is basically a larger version of the 12VDC Fluorescent Lamp Driver and can be used to light regular or blacklight tubes.Inverter Fluorescent Lamp Schematic 40w Parts List :R1 180 Ohm 1W ResistorR2 47 Ohm 1/4W ResistorR3 2.2 Ohm 1W Resistor (only needed once)C1, C2 100uF

Fluorescent Lamp Circuit Driver 12vdc

2010-08-29T11:58:00.000-07:00

Fluorescent Lamp Circuit Driver 12vdcA number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it is. It uses a normal 120 to 6V stepdown transformer in reverse to step 12V to about 350V to drive a lamp

FET Simple Symmetrical Class-A Amplifier

2010-08-29T11:55:00.000-07:00

FET Simple Symmetrical Class-A Amplifier CircuitThis is a very simple symmetrical class-A amplifier circuit diagram. It’s very simple because this circuit using common components which easily found. This circuit diagram also provides a very good amplifier unit with low distortion. Similar with other audio circuit, the sound quality are depends on the quality of the component, including transistor

Automatic Electronic Emergency Light Circuit Low Cost

2010-08-29T11:49:00.000-07:00

Description Here is a white-LED-based emergency light that offers the following advantages:1. It is highly bright due to the use of white LEDs.2. The light turns on automatically when mains supply fails, and turns off when mains power resumes.3. It has its own battery charger. When the battery is fully charged, charging stops automatically. The circuit comprises two sections: charger

Speaker Microphone Audio Circuit

2010-08-13T09:49:00.000-07:00

Notes:This circuits allows you to use a cheap loudspeaker as a microphone.Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal . The circuit is designed to be used with an operating voltage between 6 and 12 volts dc. The first transistor operates in common base mode. This has the

AVR microcontroller Based Ethernet Remote Switch Device

2010-08-12T12:07:00.000-07:00

This baby Ethernet alien accessory opens a absolutely new apple of absurd applications. It's small, it's accessible to body and there are amaranthine possibilities to use it. Ethernet has commonly been a absolutely circuitous interface. All Ethernet chips until today had 100 pins or more, area difficult to acquisition in baby quantities and difficult to use from a baby microcontroller with little

Motorcycle and Car Battery Tester Circuit

2010-08-12T11:41:00.000-07:00

Going camping nowadays involves demography lots of cyberbanking accessories whether for day to day active or for fun and entertainment. Most of the time a answerable advance acerbic array and a ability inverter would be acclimated to ensure a calmly organized anniversary area alluringly the adult and the accouchement affably use their electric and cyberbanking gear! With rechargeable lead-acid

Fluorescent Lamp Driver Circuit 12VDC

2010-08-12T11:39:00.000-07:00

A cardinal of bodies accept been clumsy to acquisition the agent bare for the Black Light project, so I looked about to see if I could acquisition a beaming lamp disciplinarian that does not crave any appropriate components. I assuredly begin one in Electronics Now. Here it is. It uses a accustomed 120 to 6V stepdown agent in about-face to footfall 12V to about 350V to drive a lamp after the

7812 IC 12 Volt 30 Amp PSU Circuit

2010-08-12T11:36:00.000-07:00

Using a distinct 7812 IC voltage regulator and assorted outboard canyon transistors, this ability accumulation can bear achievement amount currents of up to 30 amps. Notes:The ascribe agent is acceptable to be the best big-ticket allotment of the absolute project. As an alternative, a brace of 12 Volt car batteries could be used. The ascribe voltage to the regulator charge be at atomic several

500W Low Cost Inverter Circuit 12V to 220V

2010-08-12T11:34:00.000-07:00

500W Low Cost Inverter Circuit 12V to 220VUsing this ambit you can catechumen the 12V dc in to the 220V Ac. In this ambit 4047 is use to accomplish the aboveboard beachcomber of 50hz and amplify the accepted and again amplify the voltage by application the footfall transformer. How to account agent ratingThe basal blueprint is P=VI and amid ascribe achievement of the agent we accept Power ascribe

Automatic Headlight Brightness Switch Circuit

2010-08-12T11:05:00.000-07:00

Driving the artery with your high-beam headlights can absolutely access your visibility, but can he a blinding hazard for added drivers. This simple ambit can be active into your headlight about-face to accommodate automated switching amid aerial and low axle headlights back there is advancing traffic. It does this by analysis the lights of that traffic. In this way, you can drive cautiously with

+50V 3A Stabilized & Regulated Power Supply

2010-08-12T11:02:00.000-07:00

+50V 3A Stabilized & Regulated Power Supply CircuitMany times we bare a stabilized, calm adapted ability accumulation and aerial almost achievement voltage. These blueprint him it awning our circuit. It 's a ambit that can accord in his avenue + 40V until + 60V 3A, with accompanying stabilization. The abstracts that use is actual simple and will not abide difficulties in the manufacture, is

iPod Charger Simple Circuit Diagram

2010-08-12T11:01:00.000-07:00

This DIY simple iPod Charger Project aims to give simple idea on how to build you IPod charger and explain in details the materials needed and their functions. This page will serve as a guide on constructing the charger. Schematic diagram of the is shown below. The IPod charger circuit is composed of an AC to DC converter and a voltage regulator.view IPod charger diagramRequirements of a good

LM317 and LM337 regulator IC For Dual Variable Power supply

2010-08-12T10:57:00.000-07:00

D is 1N4001 diode or any of the same maximum current capacity. Fuse must be 0.5A, 250V or much lower amperage rating. Transformer is 220VAC to 26V -0 -26V, 2A or 120V to 26V -0 – 26V rating of 60VA or higher, bridge diode must be rated 3A or higher for good circuit operation. The resistors used are rated 1/2W.The input capacitor must be 4700uF or larger for better regulation and stability. The

CDI Capacitor Discharge Ignition Circuit

2010-08-07T10:46:00.000-07:00

The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and MOSFET (IRF510) are used to drive the low voltage side of a small (120/12 volt) power transformer and a voltage doubler arrangement is used on the

CD4013 Push Button CMOS Toggle Flip Flop

2010-08-07T10:41:00.000-07:00

The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to the set line through a small (0.1uF) capacitor. The high level from the Q output is inverted by the upper transistor and supplies a low reset

MOSFET and Push Button Relay Toggle Circuit

2010-08-07T10:40:00.000-07:00

This circuit is similar to the one above, but uses a N channel mosfet such as IRF530, 540, 640, etc. in place of the NPN transistor. Smaller mosfets could be used, but I don't know the part numbers. I tested the circuit with a IRF640, IRFZ44, IRFZ34 and REP50N06. The circuit has the same three advantages, it requires only a few parts, always comes up with the relay deactivated, and doesn't need

555 Timer Generating a Delayed Pulse Schematic

2010-08-07T10:39:00.000-07:00

The circuit below illustrates generating a single positive pulse which is delayed relative to the trigger input time. The circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled. When the button is depressed, the output of the first stage will move up and remain near the supply voltage until the delay time has elapsed, which in this case

Pushbutton 555 Timer Monostable Circuit

2010-08-07T10:38:00.000-07:00

The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods, a capacitor can be used to isolate the switch so that only the initial switch closure

PIC12F629 Decoded IR Toggle Switch Circuit

2010-08-07T10:36:00.000-07:00

The circuit above illustrates using the IR receiver module alongwith a PIC12F629 microcontroller to decode 5 individual IR remotecontrol keys so the circuit will only toggle one of the 4 outputswhen a particular key is pressed. The 5th key is assigned to themaster clear function that toggles off the 4 outputs. Works withmost hand held IR remote controls that send a single data

LM3909 1.5 Volt LED Flashers Circuit

2010-08-05T20:36:00.001-07:00

The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED. Two sections of a 74HC04 hex inverter are used as a squarewave

555 Tone Generator Circuit (8 ohm speaker)

2010-08-05T20:32:00.000-07:00

This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained directly from the 555 (limit = 200 mA). A small capacitor is used at the transistor base to slow the switching times which reduces the inductive

Debounced Push Button High Current MOSFET Toggle Switch

2010-08-05T20:28:00.000-07:00

This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location and switched off from another. Any number of momentary (N/O) switches or push buttons can be connected in parallel. The combination (10K, 10uF and diode) on the left side of the schematic insures the circuit powers up with the load

5 volt CMOS to 12 volt/ 25 Watt Loads Interfacing Circuit

2010-08-05T20:25:00.001-07:00

The circuit below is designed to be used with the bi-directional lamp sequencer shown above on this same page. Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps. A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS

1KW Space Heater Thermostat (SCR controlled)

2010-08-05T20:21:00.000-07:00

Below is a thermostat circuit I recently built to control a 1300 watt space heater. The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP

Low Voltage High Current Time Delay Circuit

2010-08-05T20:16:00.001-07:00

In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TIP35 or similar).

Variable Voltage Regulator With LM317T

2010-08-05T20:08:00.000-07:00

The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof. Output voltage is set by two resistors R1 and R2 connected as shown below. The voltage across R1 is a constant 1.25 volts and the

80 milliwatt Improved 3 Transistor Audio Amp

2010-08-05T20:06:00.000-07:00

This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is tied directly to the + supply. This has a disadvantage in that as the output moves positive, the drop across the 470 ohm resistor decreases

50 milliwatt Simple 3 Transistor Audio Amp Circuit

2010-08-05T20:03:00.000-07:00

Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the supply voltage is divided equally across the two complimentary output transistors which are slightly biased in conduction by the diodes between the bases. A 3.3 ohm resistor is used in series with the emitters of the output transistors to stabilize the bias current so

Micro Power AM Broadcast Transmitter

2010-08-05T20:01:00.000-07:00

In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination. A 100pF capacitor is used in place of the crystal for VFO operation. Amplitude modulation is accomplished with a

Binary Coded Decimal BCD Clock Circuit

2010-08-04T04:19:00.000-07:00

Binary Coded Decimal (BCD) Clock Tens of Hours Hours Tens of Minutes Minutes Tens of Seconds Seconds 8 4 2 1 The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that each horizontal group of 3 or 4 LEDs represents a decimal digit between

Digital Multiple Clock Timer With PIC16F628 Microcontroller

2010-08-03T13:44:00.000-07:00

This circuit uses the PIC16F628 microcontroller to provide 4 timed outputs that can be programmed from 1 minute to 1 week. An extra 8 bit shift register (74HC164) is used for the 4 timer outputs and to display four additional indicator lights. On bootup, the display will show current time of 2:57 AM and all timer settings will be set to zero. One toggle and four momentary switches are used to

60 Light Matrix Led Sequencer

2010-08-03T13:39:00.000-07:00

The circuit below illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors. The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters. The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100 by using sucessive stages

6 volt 40 LED Bicycle Light With 555 Timer

2010-08-03T13:38:00.000-07:00

The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). Two transistors are used to provide

Descrete Multistage Light Sequencer Circuit

2010-08-03T13:36:00.000-07:00

The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so that as one turns off it causes the next to turn on, and so forth. This is accomplished with a large capacitor between each stage that

Dual LED flasher 1.5 volt

2010-08-03T13:34:00.000-07:00

This 1.5 volt led fasher runs more than a year on a single 'd" cell and alternately flashes 2 LEDs at about a 1 second rate. The circuit employs a 74HC14 CMOS hex inverter that will operate at very low voltages (less than 1 volt). One section is used as a squarewave oscillator (pins 1 and 2), while the others are wired to produce a short 10mS pulse on alternate edges of the square wave so the

Small Power Transformer Telephone Ring Generator

2010-08-03T13:25:00.000-07:00

This ring generator will ring a telephone once every 10 seconds. The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is produced from the 120 volt side of a small 12.6 VAC power transformer (Radio Shack 273-1365). Both capacitors connected across the transformer windings are non-polarized / 100 volts. Circuit draws

Stirling Engine (Hot Air Engine) Solar Power

2010-07-27T13:27:00.001-07:00

A solar Stirling Engine (or Hot Air Engine) takes advantage of the fact that concentrated sunlight is a fantastic heat source, and as such can be used to generate electricity more efficiently than photovoltaic solar panels The Stirling Engine was developed in 1816 by Robert Stirling in order to offer an alternative to the frequently explosive early steam engines. Basically a closed

Cell Phone Battery Meter 3.6 Volt

2010-07-27T13:12:00.000-07:00

3.6 Volt cell phone battery meter This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3.6 volt Lithium - Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3.9 volts where the TL431 connects to the 1K resistor. The lower reference for the LED at pin 14 is set with

12 Volt Lead Acid Battery Meter Led

2010-07-27T13:09:00.000-07:00

In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LEDs will illuminate when the voltage at the negative (-) input

1 Second Time Base From Crystal Oscillator

2010-07-27T13:07:00.000-07:00

1 Second Time Base From Crystal Oscillator The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division. Using a crystal of some even multiple of 2 is desirable so

CD4040 Generating Long Time Delays Circuit

2010-07-27T12:51:00.000-07:00

Generating Long Time Delays Generating long delays of several hours can be accomplished by using a low frequency oscillator and a binary counter as shown below. A single Schmitt Trigger inverter stage (1/6 of 74HC14) is used as a squarewave oscillator to produce a low frequency of about 0.5 Hertz. The 10K resistor in series with the input (pin 1) reduces the capacitor discharge current through

Switching Supply In Telephone Ring Generator

2010-07-27T12:50:00.000-07:00

Telephone Ring Generator Using Switching Supply The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053). The inductor should have a low DC

Variable Voltage Regulator With LM317T

2010-07-27T12:49:00.000-07:00

LM317T Variable Voltage RegulatorThe LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof. Output voltage is set by two resistors R1 and R2 connected as shown below. The voltage across R1 is a

Pass Transistor Voltage Regulator with LM317T

2010-07-27T12:48:00.000-07:00

LM317T Voltage Regulator with Pass Transistor The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current sharing is established with a resistor placed in series with the 317 input and a resistor placed in series with the emitter of the pass transistor. In the figure below, the pass transistor will start

High Current Regulated Power Supply

2010-07-27T12:47:00.000-07:00

High Current Regulated Supply The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency. For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage. The LM317 requires a

Lithium Ion Charger 2 Cell

2010-07-27T12:45:00.001-07:00

2 Cell Lithium Ion Charger This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio. The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor

Digital Electronic Lock Circuit Schematic

2010-07-27T12:43:00.000-07:00

Digital Electronic Lock The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the counter will advance. As each correct key is pressed, a low level appears at

Parallel Port Relay Interface Circuit

2010-07-27T12:17:00.000-07:00

Parallel Port Relay Interface Below are three examples of controlling a relay from the PC's parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state relay will energize when a "0" is written to the data line. Figure B and C show mechanical relays controlled

32 Bit CMOS Serial Receiver

2010-07-27T12:09:00.000-07:00

This circuit was designed to control a 32 channel Christmas light show from the PC serial port. Originally designed with TTL logic, it has been simplified using CMOS circuits to reduce component count. It is a fairly simple, reliable circuit that requires only 4 common CMOS chips (for 8 outputs), an optical isolator, and afew discrete components. The schematic diagram (SERIAL.GIF)illustrates

4 Channel Temperature Data Logger

2010-07-22T20:50:00.000-07:00

Temperature Data Logger 4 Channel .fullpost{display:inline;} Here's a temperature data logger circuit, an 8-pin microcontroller based circuit for temperature data logging via the serial port of any computer from between 1 and 4 remote digital temperature sensors, DS1820/DS18S20 made by Dallas.Features of the Temperature Data Logger are are follow:Provides realtime data via the serial

50W 12 VDC-220 VAC Power Converter

2010-07-22T20:40:00.000-07:00

.fullpost{display:inline;} The power converter circuit is aimed to convert 12 VDC to 220 VAC and the process known as inverter. By inverting process will produce a 50W power converter that would supply different small appliances.The DC to AC inverters are widely used in rural electrification the require AC power which includes solar home systems, health clinics, and community centers.

12V to 24V DC- DC Converter

2010-07-22T20:36:00.000-07:00

This simple circuit is a DC-DC converter that converting up 12V source to a 24V. It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA.This DC-DC Converter can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one

Battery Booster Circuit

2010-07-22T20:33:00.000-07:00

The inspiration for this design came from the author’s experience with a mini model helicopter (from Silverlit). This particular model has a hand-held transmitter powered by six AA batteries which acts as a charging station in between flights to recharge the helicopter’s LiPo battery.Even alkaline batteries become discharged relatively quickly because of the energy demands of the helicopter

Variable DC Power Supply With LM317

2010-07-22T20:30:00.000-07:00

This DC power supply circuit is adjustable using IC Voltage Regulator LM317. LM317 is a versatile and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current with a large heat sink. It's ideal for just about any application. This was my first workbench power supply and I still use it.Since LM317 is protected against short-circuit, no fuse is necessary. Thanks to

NiCad Batteries Charger

2010-07-22T20:29:00.000-07:00

This battery charger circuit is designed for recharging NiCad batteries based on an

Cmos Single Zone Intruder Alarm Circuit

2010-07-21T17:10:00.000-07:00

This ambit appearance automated Exit and Entry delays - timed anxiety absolute - and arrangement reset. It has accouterment for normally-open and normally-closed switches - and will clothing all of the accepted ascribe accessories (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and Inertia-Sensors, see http://uk.geocities.com/ronj_1217/cmos_sza.html#is).If the Green Led is not lighting -

Combination Lock With Auto Reset

2010-07-21T17:02:00.000-07:00

FEATURES:9 to 15 Volt Operation. Can be used in a Motor Vehicle.C-Mos Design, Low Standby Power.4 Digit Enter Combination.Unlimited Reset Keys, stops accidental entry by unwanted persons playing with it. Can be used with "Touch Pads", "Push Buttons" or a Phone type "KeyPad". NOTE: High Sensitivity is NOT Required if using a "Keypad or Switches". So the 1M