Bench thermometer (CB20501E)

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

4046 Pulsing Alarm Sounder (CB25767E)
This circuit was found in the October 1994 issue of Electronics Now magazine. The 40446 IC is a...
Vehicle Alarm (CB4867E)
This car alarm was found in an American '80s documentation. The circuit automatically activates...
Intercom LM384 (CB7033E)
This circuit was obtained in an old Elektor. It is a reference, since the integrated products of the...