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    A FM transmitter overvoltage protection circuit diagram

     

    The Excentor of the FM302E-I-type FM transmitter is a 1210 motherboard using Japanese NEC. Direct frequency frequency of carriers, locking phase stabilization and frequency synthesis techniques. The pre-stage power amplifier (BLF-177 field effect tube) is directly pushed by the exciter, the maximum output power is 150W. Via the loop to the end stage, the push level of the end-level electronic tube power. The integrated power supply and power amplifier tube have a relatively expensive, and the loss is very large. Therefore, it is necessary to add overpressure protection circuits to this level of power amplifier, especially in the mountains, the summer thunderstorm season, the power line is often stringed into lightning, burn the emission equipment. Plus an overvoltage protection circuit, broadcast safe and high quality, reduce the stop rate, and save a lot of funds. The FM transmitter is a frequency wave modulation wave that changes the audio signal and the high frequency carrier, making the frequency of the high frequency carrier as the audio signal, and then enlarged, excited, amplifier, and a series of impedance matches on the generated high frequency signal. To output the signal to the antenna, the device is transmitted. Here, you will introduce an overvoltage protection circuit diagram of a frequency modulation transmitter.

     

     

     

     

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