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How to Calculate Transformerless Power Supply Circuits

Last Updated on March 9, 2025 by Swagatam 97 Comments

In this article I have explained how to calculate resistor and capacitor values in transformerless power supply circuits using simple formulas like ohms law. Analyzing a Capactive Power Supply Before I have explained the formula for calculating and optimizing resistor and capacitor values in a transformerless power supply, it would be important to first summarize […]

Filed Under: Power Supply Circuits Tagged With: Calculate, Circuits, Power, Supply, Transformerless

High Current Transformerless Power Supply Circuit

Last Updated on February 13, 2025 by Swagatam 364 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 problem of deriving high current from capacitive power supplies which earlier seemed a difficult proposition. Introduction I have discussed a few transformerless power supply circuits […]

Filed Under: Power Supply Circuits Tagged With: Current, High, Power, Supply, Transformerless

12V LED Backpack Power Supply Circuit

Last Updated on January 18, 2025 by Swagatam 9 Comments

steam2Bpunk

In this article I have explained to make a simple 12v LED backpack power supply circuit for powering a 36watt LED lamp, which includes appropriately wired integrated sockets for enabling the attachment of external devices such as a regulated battery charger, ammeter, voltmeter etc. The idea was requested by Mr.  Kevin Bates Backpack LED Charger/Driver […]

Filed Under: Power Supply Circuits Tagged With: 12V, Backpack, LED, Power, Supply

12 Amp Power Supply Circuit using Parallel LM317 ICs

Last Updated on January 18, 2025 by Swagatam 4 Comments

LM317 parallel 12 amp power supply circuit

This adjustable power supply is capable of delivering a maximum output of 12 A with an adjustable voltage from 4 V to 20 V through many LM317 ICs connected in parallel. It will allow testing of any device requiring a significant power supply, such as a direct current motor, a car amplifier, or even a […]

Filed Under: Power Supply Circuits Tagged With: LM317, Parallel, Power, Supply

100V Regulated Power Supply Circuit Diagram with Over Current and Short Circuit Protection

Last Updated on January 17, 2025 by Swagatam 5 Comments

adjustable regulated power supply circuit with current limit and short circuit protection

A trustworthy and adaptable power source is essential in the world of electronic circuits. The design we present here not only offers a regulated output voltage range of 50V to 100V but also integrates safeguards to prevent potential mishaps. Let’s examine the specifics of this power supply circuit, discovering its special characteristics and how it […]

Filed Under: Power Supply Circuits Tagged With: 100V, Current, Over, Power, Regulated, Supply

100 amp Variable Voltage Power Supply Circuit Diagram

Last Updated on January 17, 2025 by Swagatam 121 Comments

100 amps 100V

The post describes a  simple but extremely versatile 100 amp, variable voltage power supply circuit using just a few BJTs in parallel and in a common collector mode. The idea was requested by Mr. Andre. Technical Specifications Hello Swagatam, I was wondering if you could possibly assist me. on the blogs I have seen some […]

Filed Under: Power Supply Circuits Tagged With: 100, Power, Supply, Variable, Voltage

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