This delay circuit for a sound system was found in the December 1990 Radio Electronics magazine as part of a sound system.
This method of controlling the sensitivity of a phototransistor was found in an Electronics Now from the...
September 2017 - Würth Elektronik High Power Ultraviolet LEDs can be obtained from Mouser...
We found this circuit in an Electronic Design. The main integrated circuit is the 4017. The...