Stereo Pll fm transmitter BH1417

Published:2012/10/10 1:48:00 Author:muriel | Keyword: Stereo Pll, fm transmitter | From:SeekIC

This BH1417 pll fm transmitter includes features like: pre-emphasis, sound limiter, stereo transmission, low pass filter, pll circuit, fm oscillator and rf output buffer. The sound limiter maintains the same audio level so no distorsions occur, the stereo encoder separates the left and right channel enabling stereo transmission, the low pass filter blocks any audio signal above 15 Khz to prevent rf interference and the pll circuit provides a rock solid frequency stability.There are 14 possible transmission frequencies with 200KHz increments selected with a 4-DIP switch. Starts from 88.7 up to 89.9 MHz and 107.7 up to 108.9 MHz. Simply select transmission frequency at which you would like to transmit, set the combination for 4-DIP switch and BH1417 will 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.Technical Specifications:Supply Voltage: 4 – 6VTransmission Frequency: 87.7 – 88.9MHz, 106.7 – 107.9MHz (200kHz steps)Output RF Power: 20mWAudio Frequency: 20 – 15KHzSeparation: 40dBPower Consumption: 30mAComponents:1x BH1417 – Stereo PLL Transmitter IC (Case SOP22)1x 7.68 MHz Crystal1x MPSA13 – NPN Darlington Transistor1x 2.5 Turns Variable Coil1x MV2109 – Varicap Diode1x 4-DIP SwitchANT – 30 cm of copper wire 1x 22K Resistor7x 10K Resistor1x 5.1K Resistor2x 3.3K Resistor1x 100 Ohm Resistor 1x 100uF Capacitor3x 10uF Capacitor2x 1uF Capacitor 1x 47nF Capacitor3x 2.2nF Capacitor1x 1nF Capacitor1x 330pF Capacitor2x 150pF Capacitor1x 33pF Capacitor2x 27pF Capacitor1x 22pF Capacitor2x 10pF Capacitor BH1417 Stereo pll transmitter circuit diagram



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