Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

Headphones Amplifier (CB972E)
We found this circuit in an old publication (1977) using common transistors at the time and now...
Wien Bridge Oscillator (CB4922E)
This circuit uses an operational that is not currently common. We found it in an old American...
table divider by 2 (CB25675E)
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...