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Here i am describing how to create a stereo FM transmitter by using IC BH1417. It include lot of features in one small packge It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission.
Specifications
Supply Voltage: 9 – 16V
Transmission Frequency: 87.7 – 88.9MHz, 106.7 – 107.9MHz (200kHz steps)
Output RF Power: 20mW
Audio Frequency: 20 – 15KHz
Separation: 40dB
Power Consumption: 30mA
Frequency Selection / Calibration
Frequency selection is very simple. You can select transmission frequency at which you would like to transmit, set the combination for 4-DIP switch and BH1417 will immediately tune to that frequency. If you can’t hear the transmitted audio signal on your FM receiver then re-adjust 2.5 turn variable coil until you can hear the signal. If you have a laboratory power supply you may try to vary the voltage supply from 9 to 16V. While doing that BH1417 will automatically vary the voltage for MV2109 or ZMV833ATA varicap diode making sure that there’s no frequency drift.
IC BH1417 Features
1. Built-in pre-emphasis, audio limiter, audio filter circuit
2. Built-in PLL frequency synthesizer integrated for stable transmission frequency
3. Built-in Stereo Encoder
4. Built-in RF Oscillator
5. Built-in RF Output Buffer
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