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.
The configuration shown is from the National Semiconductor Linear Applications Handbook. The...
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...
This flasher with a small incandescent lamp was obtained in a documentation from the 80's. The...