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 circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...
In the figure we have the way to simulate an SCR using two complementary general-purpose...
This circuit different from the timer was found in an English publication from 1978. The circuit uses...