Found in a 1965’s Electronic Design, this circuit operates with a voltage of 1.5 V. The relay can be of a reed relay or other type.
We found this circuit in an old American documentation. Transistors can be modern equivalents. ...
In the figure we have the conventional configuration of a differential amplifier with the...
This 8 A high output power amplifier uses two National Instruments LM12s. The maximum capacity of the...