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Transistor radio tuning instruction circuit diagram

2016-05-07 14:04  
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Transistor radio tuning instruction circuit diagram
The transistor radio tuning instruction circuit is shown in Figure 1 . When the tuner is accurate, the AGC voltage is minimum, and the emitter current of VT1 is minimum, and emitter voltage drop is also minimum, VT2's emitter current is minimum, then the light emitted by light-emitting diode VD is darkest; conversely, if the tuning is offset, light-emitting diode's light is enhanced. So it can be accurately tuned according to this characteristic.