Audio Projects for Amateur Radio Stations

Around the shack or mobile in a vehicle audio amplifiers are needed for various functions. The example projects described below address this requirement mainly from a collector's point of view. For other ideas there is a lot of information on the web using modern IC amplifiers, no need to add to that here.

This little project makes use of unique features of germanium output transistors to make a very simple speaker amplifier. Uses computer, shack or vehicle +12VDC. No PCB needed, built over the weekend and works fine! Several units were built.

This is the classic military radio speaker but with a twist: it has a built-in amplifier. However the original parts are difficult to get and this project shows a solution that provides the needed amplifier without those exotic components. It is used with a 671U-4 exciter/receiver.

 

76F-1 Speaker
The reconstructed 76F-1 amplified speaker.

 

For my historic receiver display a speaker amplifier with high and low input impedance was needed and - no surprise - only an antique unit would do. Here is a detailed description of how this project using a military unit was implemented.