We found this circuit in a 1998 documentation. It tests common household appliances to see if they are shorted by lighting an incandescent lamp.
Used with telephones at the time, this circuit was found in Popular Electronics from the 90s. The...
This simple power supply is regulated by two zener diodes which, for a current of up to 200 mA,...
This circuit was found in the Italian magazine Radio Elettronica from September 1977. It is...