Is there any way for Transformerless Power Supply to output a High Current like 10A to 15A at 12V to 24V. I found highest of 500mA current output for Transformerless Capacitor Power Supply. I wanna use it for Lab requirements for an Electronics Engineer. Like running an Amplifier at 7Amp .

  • 3
    \$\begingroup\$ It's possible, just a terrible idea. \$\endgroup\$ Commented May 9, 2015 at 19:42
  • \$\begingroup\$ What voltage do you want? For what purpose do you need it? Technically, a wall socket is transformerless as well. :-P \$\endgroup\$
    – Ladislav
    Commented May 9, 2015 at 20:02
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    \$\begingroup\$ You are looking too closely at a solution, without letting us as a community evaluate the actual problem. You haven't given us any details at all about the application, and we need that if we're going to help you. Edit the question to include what this is for, why you need it to be transformerless and what the voltage output needs to be. \$\endgroup\$
    – user39962
    Commented May 10, 2015 at 3:14
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    \$\begingroup\$ When you say Lab requirements, you mean a bench power supply? Very bad idea to use a non isolated supply for connections which are going to be touched when on since there is a high likelihood of electric shock even though the output voltage difference is low, because of the voltage to earth. If you use it for an audio amplifier, any item you connect will share the "0V" point which makes that point on the other equipment live as well. \$\endgroup\$
    – Martin
    Commented May 10, 2015 at 9:49
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    \$\begingroup\$ You can get want you want with a switch mode power supply. Higher frequencies can make the transformer really small and very efficient while still providing galvanic isolation. \$\endgroup\$
    – user39962
    Commented May 10, 2015 at 17:52

1 Answer 1


According to Microchip Application Note 954 It is possible to create transformerless power supply circuits. The application note provides analysis information over some sample circuits and give formulas to calculate circuit parameters.

In the document, it is given 2 base models of circuits:

  1. Capacitive circuit
  2. Resistive circuit

Given the formulas and calculations, for example if it is needed to use like 200mA output current, the power dissipation of some important components rise to 100Watts. Which means higher the output current increases the power dissipation of components for the circuit. Thus to get this amount of power, the feasibility of the idea becomes negative.

In English: It is possible but NOT logical.

  • \$\begingroup\$ Thanks for sharing this. Really appreciate it. As an Engineer It just bugged me that why we still use such crude method as a transformer \$\endgroup\$
    – Ahmad
    Commented Sep 9, 2015 at 10:40

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