Electromechanical Circuits


1. Relay Changeover System

Shown below is a simple relay based aerial changeover module based on the Schrack RT2 relay. Coil voltage msy be selected for each specific application, mine is 12V DC. The relay operate and release times are fine for push to talk operation but too slow for full break-in. The contacts are gold flashed silver rated at 8A but may require wetting for very low signal levels.

Set the scale on printing so that the PCB image is of the size shown. The triangle symbol represents a through link eyelet connecting top and bottom ground copper together.