Here is the circuit diagram of a simple and low cost AM radio. The working of this radio circuit is straight forward. Inductor L1 and capacitor C1 forms the necessary tank circuit. Diode D1 performs the job of de-modulation. Transistor T1 is wired as a preamplifier whose output is further amplified by the IC LM386 to drive the head phone Z1. The 10K POT R3 can be used as a volume controller.
- The circuit can be powered from a 9V PP3 battery.
- Use a 100cm long metal wire as antenna.
- Experiment with the value of L1 for catching other bands.
- The circuit can be assembled on a Vero board.