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FM transmitter over-voltage protection circuit

2016-04-08 03:34  
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FM transmitter over-voltage protection circuit
The actuator of the FM302E—I FM transmitter uses the HPB-1210 motherboard which is produced by the NEC company. This device modulates the frequency of carrier wave directly, and it uses the phase-locked frequency stability technology and the frequency synthesis technology. The former stage power amplifier (BLF-177 mosfet) is directly promoted by the actuator, the maximum output power is 150W. The power adds to the final stage through the circulator that can be used as the driver stage of the last stage vacuum tube's power amplifier. The pre-amplifier power supply uses the 4NICK48 integrated power supply. Unfortunately, this stage has no over-voltage protection circuit and the DC voltage indication function, this makes this stage occurs some faults such as: the actuator output is normal, but this stage and the last stage have no output power.