This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1 and C1. The circuit is from a March 1996 Electronics Now.
Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today....
This circuit was found ina 90s Popular Electronics. It is intended for switching analog video...
We found this alarm circuit in a Radio Electronics magazine from July 1990. The power transistor must be...