This circuit diagram shows detail electronics schematic for ZN414 AM Radio Receiver  designed by Harry Lythall. This device consists of a single transistor mixer then a ZN414 radio IC to provide the gain and detection. A 741 OP-AMP is used as the final audio stage, but this could be replaced with an LM380, if you want to drive a small loudspeaker.

am radio receiver circuit diagram 

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