Transformerless Power Supply | CircuitDiagram.Org

Many times we want a simple power supply to operate our low power electronics or electronic circuits. Most of the power supplies use transformers but there is also some tricks to get voltage of your needs from transformerless power supplies. Transformerless power supplies are very

important and works well on the places where you have short place and low mA requirements. The circuit mentioned below is a simple and verastile power supply circuit which is capable of delivering any voltage from 3 to 12 volts by selecting suitable parts values you can obtain voltage of your needs.

Here are some details of part values you can change to get the required voltages.

For 3V Use R2 = 15K, D2 = 3V & C1 = 220µF

For 6V Use R2 = 12K, D2 = 6.2V & C1 = 220µF

For 9V Use R2 = 10K, D2 = 9V & C1 = 220µF

For 12V Use R2 = 10K, D2 = 12V & C1 = 470µF