Non Inverting Amplifier (CB6437E)

This non-inverting AC amplifier was found on a Popular Electronics. The setting applies to any operational amplifier.

Audible Voltmeter (CB21395E)
This circuit was found in an American publication from 1969. Transistors are from the time and can be...
Password Lock (CB21545E)
We found this circuit in a 1998 documentation. The circuit makes use of CMOS logic and must be...
Code Practice Oscillator (CB23582E)
This 1 transistor circuit is from a Radio Electronics from December 1958… The circuit is battery...