Operating in class AB1, this high-fidelity amplifier was found in the 1961 RCA tube manual. The circuit has high input impedance and good gain.
With a touch of switch S1 the motor starts and remains so until a touch of switch S2 turns it off....
This classic positive side current sensor is from a 2005 Linear Technology manual. The transistor is...
In the figure we have a 9V source using a 5V 7805 regulator. The circuit is from an American...