Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor constant. The power transistor depends on the motor.
The relay used in this circuit must be of the sensitive type with a trigger current less than 10...
This high impedance input amplifier is suitable for the use with piezoelectric sources such as...
This circuit was found in a 1965 General Electric manual. What it does is give a warning if you...