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.

10 A Bidirectional Current Sensor (CB5261E)
With this circuit it is possible to monitor the charge and discharge of a battery. The circuit is...
Variable High Pass Filter 23 to 700 Hz (CB25821E)
This high pass filter was found in the February 1996 Electronics Now magazine. The circuit...
Charger and Regulated Adapter Nicad (CB19075E)
This automatic nickel-cadmium or NiCad battery charger was found in European documentation from...