Dc Power Supply Circuit Diagram. What is a variable power supply. For smaller voltages we normally use batteries as a reliable source.
Often more than one dc voltage is required for the operation of electronic circuits. A variable dc power supply is very important for electronics projects prototyping and hobbyists. It helps us to design the sections of the circuit individually and then at the end put them together to have a complete circuit ready for use.
We ll now go over each part of this circuit and go over the role each component plays so that you can know how this circuit works in its entirety.
First power supply circuit is built with bd139 one zener diode and a few passive components. Instead of using batteries which have a limited lifetime a variable dc power supply can be used which is implemented in this project. When we create a dc power supply it creates dc voltage from the ac mains. How can the addition of nothing but a capacitor have such a great effect on the amount of dc voltage output by the circuit.
