This small control for DC motors up to approximately 1 A uses an operational amplifier that admits equivalent. The transistor can be TIP29 for currents up to 1 A or BD135 for 500 mA.
This power supply provides a12 V stabilized output. The transistor must be provided with a good...
This circuit, which can be used as a shield, was found in American documentation from the 1970s....
Found in American documentation from the 90s, this circuit shows how to derive a signal in the...