This circuit was found in documentation from the 80s. The components are from the time, but the configuration can be adapted to use modern components.
This circuit is the digital indicator for the previous circuit and can be used with similar...
This circuit is found in documentation from the 1990s. The load can be a relay and the sensor, an LDR of...
This circuit limits (clip) the intensity of a signal, according to the setting of P. The circuit is...