Scale Expander for 12V Meter (CB21330E)

This circuit was found in a QST from the 1990s. The circuit expands the scale of a 10V instrument to measure 20V.

Alarm (CB196E)
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...
AC Inverter Amplifier with 5 V MC33171 (CB15270E)
This circuit can also use other series operational amplifiers such as MC33172, MC33174, MC35171,...
Symmetrical 9 V Power Supply (CB18699E)
This circuit was originally designed to power the CB18698's MSX interface, but it is suitable for...