We found this circuit in the January 1978 issue of Radio Electronics magazine. The integrated circuit is from that time and is powered by a 9 V battery. The signal must be applied to an amplifier.
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...