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4 Transistor FM Receiver

2016-05-07 18:34  
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4 Transistor FM Receiver

 

4 Transistor FM Receiver

 


This is a pocket sized receiver I built in 1994. The idea was to make a simple but useable receiver running off 3V. My previous 6 transistor receiver was more bulky, requiring 12V. This meant 10 x AA cells. I designed and made a PCB, and constructed a small aluminium case to keep the receiver as comact as possible. There is nothing unusual with this design. The detector uses a simple Colpitts oscillator and is of a type commonly used in other super regen receivers. Of course it is self quenched. Sensitivity with this type of detector is relatively low, but it's simple and easy to get working. As always, I provided a regeneration control to set the optimum operating point; ie. max sensitivity and minimum SCA/stereo subcarrier beat.


4 Transistor FM Receiver







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