Charger protection relay (CB26312E)

This circuit was obtained from an Elektor magazine from the 90s. The circuit is to protect batteries while charging.

3.5 MHz Loop Antenna (CB4758E)
This loop antenna was found in a 1990s documentation. The circuit includes a field strength meter. The...
Shield for MSX (CB18698E)
If the reader has an old MSX still working, it can be used as a microcontroller for your robotics...
Microammeter Amplifier (CB19584E)
This transistorized stage of an old documentation aims to increase the sensitivity of a...