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 (T1). Transistor T1 along with transistor T2 amplifies the sound signals and offers existing pulses in the collector of T2. When audio is produced in front from the condenser mic, triac1 (BT136) fires, activates lights plus the bulb (B1) glows for about two minutes.
Assemble the sound activated lights circuit on a general objective PCB (circuit board) and enclose inside a plastic cabinet. Energy for the sound activated change circuit is often derived from a 12V, 500mA step-down transformer with rectifier and smoothing capacitor. Solder the triac making sure adequate spacing among the pins to avoid short circuit. Resolve the unit within the dog’s cage or shut to the audio monitoring spot, using the lamp within or outdoors as sought after. Connect the microphone for the sount activated lights circuit employing a brief size of shielded wire. Enclose the microphone inside a tube to increase its sensitivity.
