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.

Pulse Width Control with the 741 (CB13830E)
This circuit was found in old documentation and can be implemented with other operational...
Central Alarm (CB16550E)
This circuit, published in 1988, uses several types of sensors and relays to activate warning...
Vswr protection circuit (CB20375E)
This protection circuit for standing waves was found in a manual of high frequency circuits and...