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You are here: Home / Archives for Power Supply Circuits / Transformerless Power Supply

3 Solid-State Single IC 220V Adjustable Power Supply Circuits

Last Updated on June 18, 2022 by Swagatam 14 Comments

These AC to DC power supplies use a single chip to convert mains 220 V or 120 V input AC into 12 V or 5 V DC without depending on […]

Filed Under: LM317/LM338, Power Supply Circuits, Transformerless Power Supply

1.5V Power Supply Circuit for Wall Clock

Last Updated on May 17, 2019 by Swagatam 93 Comments

The post presents a simple transformerless 1.5V DC power supply circuit which can be used for powering wall clocks directly from mains, and also keep a stand by back-up cell […]



Filed Under: Transformerless Power Supply

Transformerless Relay Driver Stage

Last Updated on March 8, 2019 by Swagatam 8 Comments

In this post we discuss an enhanced transformerles power supply circuit design which consists a well stabilized and regulated DC stage along with a relay driver stage which operates through […]

Filed Under: Home Electrical Circuits, Power Supply Circuits, Transformerless Power Supply

0-300V Adjustable MOSFET Transformerless Power Supply Circuit

Last Updated on November 23, 2022 by Swagatam 214 Comments

This simple MOSFET controlled transformerless power supply circuit can be used for delivering a continuously variable 0 to 300V DC output and a current control from 100 mA to 1 […]

Filed Under: Power Supply Circuits, Transformerless Power Supply

MJE13005 Compact 220V Power Supply Circuit

Last Updated on June 18, 2022 by Swagatam 66 Comments

The following article presents a very simple low current mains operated transformerless power circuit using an inexpensive MJE13005 transistor and few other passive electronic components. As can be witnessed in the given […]

Filed Under: Power Supply Circuits, Transformerless Power Supply

High Current Transformerless Power Supply Circuit

Last Updated on January 4, 2023 by Swagatam 316 Comments

The simple configuration of a transformerless power supply circuit presented below is able to provide high current at any assigned fixed voltage level. The idea seems to have solved the […]

Filed Under: Power Supply Circuits, Transformerless Power Supply

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