Originally indicated as an alarm alert in a 1990s US publication, this circuit can be used as a shield to control a strobe lamp. The sensor is a optocoupler with LDR.
ON Semiconductor AMIS−3910XGEVB Evaluation Board demonstrates the features and capabilities of the...
This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output...
With each touch on S1, an output of 4017 is activated, this in sequence 3, 2, 4, etc. These...