Archive for the ‘Communications’ Category

Low Power AM Transmitter

Posted: September 21, 2009 in Communications

This is a project during our 5th year in college, a low power AM transmitter, this transmitter can reach up to 150ft and can transmit at frequencies from 697 to 896 Khz. This transmitter consist of a clapp oscillator, a buffer, RF amplifier  and modulating signal driver. The oscillator can be tweaked to operate to other frequencies by tweaking C6 and the RED IF coil. If using other input device other than the EM80 microphone such as MP3 players, resistor R8 must be disconnected.  Another thing in building this transmitter is that the PCB layout is critical specially in the oscillator section because of the high frequencies involved.

Click image to view the full schematic