Solar radio (CB20485E)

This circuit is from a 1991 publication. The integrated circuit used is an integrated radio from that era.

Light operated switch (CB8321E)
This circuit was found in 1960s Radio Electronics. The circuit uses components from that time. The...
Operational Bistable (CB19359E)
In the figure we have a bistable multivibrator using an operational one. The circuit is from old...
Electronic Cigarette Lighter (CB4301E)
With a touch of S1 this circuit keeps a small strand of nichrome warm enough to light a cigarette....