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 oscillator with base current drop can be used like the well-known grid-dip meters, but which...
This circuit is intended to maintain constant current in a heating element. This element must have...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...