This is actually an AM tuner using the MPF102 "Infinite Impedance" circuit and feeding the output to a simple AF stage (an LM386 IC). I don't own the right to post the great article on the "Infinite Impedance" circuit nor the schematics, but here's the link yo the website:

[ Ссылка ]

As the author claims, "any coil will work". This little radio works like a charm and is lots of fun to build and operate! Please tell me if you build one or improve it!

свернуть