This circuit with the ULN3784B appeared in the October 1984 issue of Radio Electronics magazine. It can typically be powered from 9 to 24 V.
Using an optocoupler this circuit turns on the light in a bedroom for a set amount of time when...
The presented circuit uses two old germanium transistors. We found this configuration in a...
The circuit shown fires an auxiliary flash from a flash commanded directly by the camera. The sensor...