This test circuit was found in the PE Hobbyst Handbook in a 1990s edition. The circuit tests the battery under load. The load, as the battery is selected by the switch.
This sensitive field strength meter was found in 1993 documentation. The instrument may be the...
This circuit was found in a 1967 General Electric manual. It is intended for the control of high...
The figure shows how to vary the output voltage of a 7812 regulator between 12 V and 2 V less than...