Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The circuit is CMOS using an integrated 4011.
The circuit shown can be used in an audio link using visible light or IR. Any photo transistor can be...
The purpose of this simple configuration, found in old documentation, is to trigger a buzzer if...
This circuit was obtained from the 2005 manual of Linear Technology LT1306. The formulas for...