This 80's General Electric circuit is guarded by the noise-guard for operating current. The circuit has an input sensitivity of 3 pA. The font must be symmetrical.
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...