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0-300V Adjustable MOSFET Transformerless Power Supply Circuit

The post explains a simple mosfet controlled transformerless zero to 300 volts variable voltage and current power supply circuit which can be used for many different applications.To protect against my higher voltage research projects from shooting up in smoke permanently, I developed an easy circuit which is able to render a variable voltage supply of … Read more0-300V Adjustable MOSFET Transformerless Power Supply Circuit

MJE13005 Compact 220V Power Supply Circuit

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 circuit diagram, the design is extremely straightforward. How it Works Transistor T1, which is a high voltage NPN transistor MJE13005 forms the main active component … Read moreMJE13005 Compact 220V Power Supply Circuit

High Current Transformerless Power Supply Circuit

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 problem of deriving high current from capacitive power supplies which earlier seemed a difficult proposition. I assume I am the first person to have invented … Read moreHigh Current Transformerless Power Supply Circuit

Making a 220v to 110V Transformerless Converter Circuit

The presented circuit has been taken from an old elektor electronic magazine which describes a neat little circuit for converting 220V mains input to 110V AC. Let’s learn more about the circuit details. Circuit Operation The shown circuit diagram of a transformerless 220v to 110v converter utilizes a triac and a thyristor arrangement for making the circuit successfully work … Read moreMaking a 220v to 110V Transformerless Converter Circuit

4 Simple Transformerless Power Supply Circuits Explained

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 input AC mains voltage. 1) The Transformerless Power Supply Concept The transformerless concept works by using a high voltage capacitor to drop the mains AC … Read more4 Simple Transformerless Power Supply Circuits Explained

How to Calculate Transformerless Power Supplies

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 formula for calculating and optimizing resistor and capacitor values in a transformerless power supply, it would be important to first summarize a standard transformerless power … Read moreHow to Calculate Transformerless Power Supplies

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