This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering an LED. Trigger adjustment is done in a trimpot.
Found in the 1995 Encyclopedia of Electronic Circuits volume 5, this circuit has a constant...
This circuit monitors the passage of objects on a conveyor, triggering an alarm when objects lock...
This circuit is used to sense temperatures in degrees Celsius and Fahrenheit. The circuit is from...