JK 4037 Flip Flop with Reset (CB25121E)

We found this circuit in the April 1988 issue of Radio Electronics magazine. The circuit can be reset electronically.

Infrared controlled soldering station (CB7021E)
This circuit was found in 80's Popular Electronics. The circuit uses an infrared-sensitive phototransistor...
Charge and Discharge Monitor (CB5408E)
Supplied in a 2005 Linear Technology Application Manual, this circuit monitors the charge and...
Null Detector (CB5071E)
We found this circuit in an American 1980s documentation. Transistors may be general purpose...