Magnetic Sensor Amplifier (CB6494E)

This circuit was obtained from a Philips documentation from 1970. It can be built on modern operational amplifiers.

| Clique na imagem para ampliar |

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...