This circuit is from old documentation, using a component that cannot be found easily today. The indicator is a galvanometer, and the input voltage is in the order of 1 V.
Lamps in the range between 20 and 50 mA can be used. Voltage supply is according the lamp and...
The purpose of this circuit found in an old documentation from the 90's is to switch on low...
This configuration, which appears elsewhere on this site, was found in documentation from the...