A simple AM ​​transmitter circuit

Below is the circuit for a simple AM ​​transmitter. This circuit is available in kit form and will work just fine since the kit is commercially available.

The circuit uses a combination of transistors SA101 and SA103 as a modulation signal amplifier.

Medium wave (MW) is a part of the medium frequency (MF) radio band used primarily for AM radio broadcasting. For Europe, the MW band ranges from 526.5kHz to 1606.5kHz, while in North America, the extended MW broadcast band runs from 535kHz to 1705kHz.

The wavelengths in this band are long enough that the radio waves are not blocked by buildings and hills, and can travel along the curvature of the Earth beyond the horizon; this is called ground wave. Actual ground wave reception typically extends to 200-300 miles, with longer distances over terrain with higher ground conductivity and greatest distances over salt water. Most broadcast stations use ground wave to cover their listening areas.