Simple Am Radio Transmitter Circuit. This is a very simple easy to make am transmitter if you don t want to use inductors or capacitors and don t mind not having extreme power. You can make your own simple am radio antenna using a piece of wire.
For example if you get 2 volts then slightly re tune so you get 1 95 and leave it. The q2 transistor generates an rf signal in the form of the colpitts oscillator circuit. Rotate the trimmer capacitor and tune maximum reading on the high side of the frequency you need that is the best tune point.
The circuit displayed below is a tunable am signal trap circuit which can be controlled to retrieve unwanted am signals and channel the remainder to the receiver.
Connect ground of the circuit to your earth connection for crystal radio testing or your water pipe. For example if you get 2 volts then slightly re tune so you get 1 95 and leave it. This version uses only one transistor and can be tuned to any desired frequency near the top of the am band. For the wireless spy transmitter circuit everything becomes pretty simple and you just have to hide the transmitter circuit in some suitable place like under the table couch sofa etc.
