This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA currents with load indicator through LEDs.
This traditional configuration that any Series 139 comparator can use is found in the 1990...
Incandescent lamps and heaters can be controlled by a low power switch using this circuit. The...
The figure shows how to use an oscilloscope for diode test. The circuit presents the...