This circuit was found in a 1965 General Electric manual. It is intended for cars that have negative ground. At the time there were vehicles with positive mass.
This circuit was found in Texas Instruments documentation from the 1980s. The circuit has a Q less...
This circuit is from an English publication from 1978. The operational admits equivalents and the...
P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The...