Transformerless 12v Dc Power Supply Circuit

Before designing a transformerless power supply some facts about ac dropping through a capacitor or resistor are to be considered.

Transformerless 12v dc power supply circuit.

If a circuit requires very low current of a few milliamperes transformerless power supply is an ideal solution. R2 limits inrush current. Resistive type power supply on the other hand dissipates more heat so the power loss is quite high. C1 is the x rated ac capacitor that reduces high volt ac.

Low voltage dc like 5v 6v 9v 12v is used in electronics circuits led bulbs toys and many household electronics items generally batteries are used to power them but they need to be replaced time to time which is not cost effective and also takes our time energy. Each time i intend to use transformerless power supply to power microcontroller 8051 atmega328p and even a dc fan of 12v 1 4a i notice that they never get powered even though the power supply has been tested to produce the required 12v or 5v dc as the case may be. R1 is the bleeder to remove stored current in ac when power is off. A transformerless power supply basically translates a high voltage ac into a desirable dc voltage without the use of a transformer.

A zener can be used in the output to get regulated dc. Transformerless power supply circuit diy project syed saad hasan 1 354 views 3 months ago designing efficient power supplies are a major concern of today s electronics as one of the main issues in modern day electronics is to efficiently generate low voltage dc from an ac source such as a wall outlet to power any circuit. D1 d4 rectifies ac to dc and c2 removes ripples. The main component of a transformerless power supply circuit is a voltage dropping capacitor or x rated capacitor which is specially designed for ac lines.