Using the CA3140 in the figure we have a comparator that goes low in the window voltage space. The circuit was found in June 1986 Radio Electronics magazine.
This simulation shows how a transistor can be used as a switch turning on and off in the LED. The...
This circuit was obtained in an English publication of 1975. It is a circuit that stabilizes an...
This is a common circuit in the 1990s, when experimental FM transmitters were in vogue. The...