This is an interesting configuration of the LM317 voltage regulator found in an EDN from the 90s. The circuit uses an optical coupler and is intended to supply constant current to a sensor resistor.
This LED signaling circuit uses a programmable unijunction transistor (PUT) as a relaxation...
This decoder filter was found in a 1975 documentation. The integrated circuits can be 741. The...
We found this circuit in the January 1997 Electronics Now magazine. The triac determines the...