This circuit uses an unusual sensor nowadays, but the configuration can be adapted to more modern types, as well as the operational amplifier. The circuit is from an 80's documentation.
This configuration is from the 70s, having been found in an American documentation. The...
This circuit was found in the August 1992 issue of Radio Electronics magazine. The circuit can be...
This simple test tells you whether a PNP or NPN transistor is OK. The signal is given by turning on...