This circuit uses an LED (called SSL) to regulate current in a configuration with complementary transistors. The circuit is from 1970 General Electric documentation.
A high level on the input of this circuit causes the trim voltage adjusted output voltage to drop to 1.2...
We found this alarm in a 1992 documentation. The circuit has several timings and the relay can...
This windshield wiper interval switch was found in the April 1990 issue of Radio Electronics...