Transformerless 12v Dc Power Supply Circuit

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.

Transformerless 12v dc power supply circuit.

Generating low voltage dc from the 220v or 110v ac mains is very useful and necessary in the field of electronics. 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. Please i am having this issues with transformerless power supply. If a circuit requires very low current of a few milliamperes transformerless power supply is an ideal solution.

This is a transformerless power supply for low current applications. A zener can be used in the output to get regulated dc. Resistive type power supply on the other hand dissipates more heat so the power loss is quite high. R1 is the bleeder to remove stored current in ac when power is off.

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. C1 is the x rated ac capacitor that reduces high volt ac. A transformerless power supply basically translates a high voltage ac into a desirable dc voltage without the use of a transformer. Before designing a transformerless power supply some facts about ac dropping through a capacitor or resistor are to be considered.