The LM121 integrated circuit is no longer common in our market, with more modern equivalent versions. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x...
This circuit is from a Radio Electronics from December 1964. The components are from the time and...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...