The purpose of this circuit is to indicate which of the two cars crosses the finish line first on a slot car lane. The circuit is from an 80's Popular Electronics.
This circuit is from the 1960 Mullard transistor manual. The transistors are germanium from the...
This circuit, which may have other applications, trips a load if the voltage on the telephone line...
This circuit was found in a 1986 documentation and can use any operational amplifier like the 741...