We found this circuit in documentation from the 90s. Instead of a voltmeter, you can use the voltage scale of a multimeter. The circuit tests batteries under load.
Radio Electronics published this circuit in a 90's edition. The circuit makes use of an uncommon...
The circuit is simple, as it uses only one transistor and a relay that can be MC2RC1 or MC2RC2,...
This small transmitter for the medium wave range (MW) was found in a 1980 publication. Its signals...