Circuit diagram of AM radio receiver-EEWORLD

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This is the circuit diagram of the mini AM Radio receiver.

All general purpose transistors should work in this circuit, you can use a BC549 transistor in this circuit.

The circuit uses a compact three-transistor regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC now superseded by the MK484. The design is simple and the receiver sensitivity and selectivity are good.

All connections should be short, suitable for veroboard or label strip layout. The tuning capacitor has a fixed plate and a moving plate. The moving plate should be connected to the "cold" end of the tank, which is the base of Q1, and the fixed plate should be connected to the "hot" end of the coil, which is the junction of R1 and C1. If the connections on the capacitor are reversed, holding your hand close to the capacitor will cause unwanted stability and oscillation.

AM Radio Receiver PCB Design:

The image below is a full size (scale = 1:1) copy of the copper layer. Note that this is reversed so the veropins now appear on the left side of the top side. Remember that this is the lower (solder) side and by looking at the top image you should be able to match up the positions of all the components.

Reference address：Circuit diagram of AM radio receiver

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