This circuit can be adjusted between 0.2 and 2 V to trigger with chosen voltages comparing them with the input voltages. We found it in a 1967 documentation.
From an audio signal, this circuit gets two signals of the same amplitude and opposite phases....
This conventional relay light detector circuit uses a 741 as a voltage comparator. The sensitivity...
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...