This circuit is from the National Semiconductor's Linear Applications Handbook of 1994. The circuit can be implemented with equivalent operational. The detected voltage is given by the diode.
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...