You can build an AM radio out of 4 resistors, 3 capacitors, a couple transistors that are present in most electronics and easily cut out, and a coil of wire. If

You can build an AM radio out of 4 resistors, 3 capacitors, a couple transistors that are present in most electronics and easily cut out, and a coil of wire. If you have a crystal, you might not even need a voltage source! I just looked it up, and there are FM circuits with similar component counts, so I guess I have no idea what I'm talking about! :)