Found in a 90’s Popular Electronics, this circuit uses two CMOS inverters to generate a signal of a few hundred hertz determined by C1 and the R3 setting.
This circuit, from a 1988 documentation, makes successive actuation of the shower to control the...
This circuit was found in a 90s Popular Electronics. The circuit indicates if a transmitter is working,...
This circuit was found in a Motorola documentation from 1975. Modern equivalent transistors such...