This circuit behaves as a voltage controlled resistor and can serve as a small load. The circuit is from a Radio Electronics from July 1988.
Crystals from 100 kHz to 1 MHz can be used in this 1957 Raytheon circuit. 4 can have values...
This circuit behaves as a voltage controlled resistor and can serve as a small load. The circuit is...
This circuit is from a 1977 Radio Shack manual. The photocell is an LDR and the operational one is a...