We found this circuit in a 1998 documentation. It tests common household appliances to see if they are shorted by lighting an incandescent lamp.
This circuit can function either as a crystal or galena receiver with a pre-amplifier using a FET...
This ultrasonic insect repellent was found in American documentation from the 1980s. The...
The purpose of this circuit found in a 1994 documentation is to drive a 24 V motor. The circuit...