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4 Simple Transformerless Power Supply Circuits Explained

Last Updated on February 17, 2023 by Swagatam 345 Comments

105/400V capacitor 1uF 400V capacitor for transformerless power supply

In this post we discuss 4 easy to build, compact simple transformerless power supply circuits. All the circuits presented here are built using capacitive reactance theory for stepping down the […]

Filed Under: Transformerless Power Supply

How to Use LM317 for Making a Variable Power Supply Circuit

Last Updated on June 19, 2020 by Swagatam 170 Comments

In this post we will elaborately discuss how to build a simple LM317 based adjustable power supply circuit using minimum number of external components. As the name suggests a variable […]



Filed Under: LM317/LM338, Power Supply Circuits

How to Calculate Transformerless Power Supplies

Last Updated on December 18, 2020 by Swagatam 89 Comments

This post explains how to calculate resistor and capacitor values in transformerless power supply circuits using simple formulas like ohms law. Analyzing a Capactive Power Supply Before we learn the […]

Filed Under: Power Supply Circuits, Transformerless Power Supply

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