Cascading Zeners (CB21528E)

This circuit was found in a 1967 Motorola manual. Its purpose is to provide a very accurate reference voltage of 0.555V.

Magnetic field meter (CB7067E)
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
Telephone Dialer (CB5979E)
This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference,...
3 Volt Switched Regulator LM2577 (CB15410E)
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...