Bench thermometer (CB20501E)

With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a 1991 documentation.

Lamp Flasher (CB450E)
This astable multivibrator using two transistor controls two small 50 mA lamps. The lamps can be...
Touch bistable 4011 (CB9566E)
This biestable touch circuit was found in American 1980s documentation. The circuit must not be...
Telephone Amplifier (CB4553E)
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...