This normally open, two-terminal, high-sensitivity circuit was found in General Electric's technical documentation from the 1980s. The circuit is half-wave.
This low drift or offset circuit is from an 80's documentation. The configuration can be made with...
This circuit has a logarithmic response as a function of the light falling on the sensor. The...
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...