Continuity test (CB8211E)

This continuity test was found in a 90s Popular Electronics. The circuit applies a voltage of 300 mV to the component or circuit under test.

| Clique na imagem para ampliar |

Amplifier with modulator (CB9176E)
This circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....
Light relay (CB23551E)
This photoelectric cell light relay was found in Radio Electronics magazine from April 1958. The...
Cassette Tape Retriever (CB10832E)
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...