BH1417 Block Diagram
Stereo PLL FM Transmitter With BH1417 Schematic
This is the latest BH1417 FM Transmitter architecture from RHOM that includes a lot of appearance in one baby package. It comes with pre-emphasis, limiter so that the music can be transmitted at the aforementioned audio level, stereo encoder for stereo transmission, low canyon clarify that blocks any audio signals aloft 15KHz to anticipate any RF interference, PLL ambit that provides bedrock solid abundance manual (no added abundance drift), FM oscillator and RF achievement buffer.
There are 14 accessible manual frequencies with 200KHz increments that users can baddest with a 4-DIP switch. Lower bandage frequencies alpha from 88.7 up to 89.9 MHz, and high bandage frequencies alpha from 107.7 up to 108.9 MHz.
BH1417 can be supplied with 4 - 6 voltage and consumes abandoned about 30mA, accouterment 20mW achievement RF power. BH1417 provides 40dB approach break which is appealing good, although earlier BA1404 FM Transmitter dent provides hardly bigger 45dB approach separation.
BH1417 is abandoned accessible in SOP22 IC case so this may be an aggravation for some folks. On the added hand, because the dent is abate than approved DIP-based ICs it is accessible to fit the absolute transmitter on a baby PCB.
BH1417 dent may additionally be acclimated a angle abandoned stereo encoder. The advantage of that is that you accept abounding abandon of application a transmitter & amplifier of your choice. You will still accept a pre-emphasis, limiter, stereo encoder and low canyon clarify in one baby amalgamation because actual few alien apparatus are appropriate for these blocks. PIN 5 is MPX achievement that can be anon affiliated to an alien FM transmitter through a 10uF cap.
There are 14 accessible manual frequencies with 200KHz increments that users can baddest with a 4-DIP switch. Lower bandage frequencies alpha from 88.7 up to 89.9 MHz, and high bandage frequencies alpha from 107.7 up to 108.9 MHz.
BH1417 can be supplied with 4 - 6 voltage and consumes abandoned about 30mA, accouterment 20mW achievement RF power. BH1417 provides 40dB approach break which is appealing good, although earlier BA1404 FM Transmitter dent provides hardly bigger 45dB approach separation.
BH1417 is abandoned accessible in SOP22 IC case so this may be an aggravation for some folks. On the added hand, because the dent is abate than approved DIP-based ICs it is accessible to fit the absolute transmitter on a baby PCB.
BH1417 dent may additionally be acclimated a angle abandoned stereo encoder. The advantage of that is that you accept abounding abandon of application a transmitter & amplifier of your choice. You will still accept a pre-emphasis, limiter, stereo encoder and low canyon clarify in one baby amalgamation because actual few alien apparatus are appropriate for these blocks. PIN 5 is MPX achievement that can be anon affiliated to an alien FM transmitter through a 10uF cap.
