Found in a 90s Popular Electronics, this circuit fires an old flash of xenon from the pulse of light received by a sensor. The trigger, however, is made with a delay given by C2.
We found this circuit in a 1986 documentation. It causes 40 LEDs to flash sequentially. The big...
Exciting a sequential circuit with the output of a stereo we can make a set of lamps run at a...
This alarm from an old 1978 publication uses PNP transistors and driver and output transformers that are...