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Question: Simple FM reciever????

samy555

May 11, 2010
63
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May 11, 2010
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63
The following is FM radio reciever circuit from:
http://www.hqew.net/circuit-diagram/Small-FM-Radio-Circuit_8896.html

Tiny-FM-Radio.png


I do not intend to implement, but Surprised by the way the two transistors T1&T2 connected.
The tuned recieved FM signal inter the collector of T2 and out of its base to feed to the audio amplifier
It is the first time in my life watching that stage audio feed from the base of the transistor
Can you help me understand the work of those two transistors?
Thank you very much
 

duke37

Jan 9, 2011
5,364
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Jan 9, 2011
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5,364
I have not seen this circuit either. It looks to me to be an oscillator, running at the FM frequency which is modulated by the incoming signal.
Super regenerative receivers are used in car locks. This may be one of those.
 
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