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Power Supply Circuits

LM317 with Outboard Current Boost Circuit

Last Updated on December 10, 2023 by Swagatam 177 Comments

317 2

The popular LM317 voltage regulator IC is designed to deliver not more than 1.5 amps, however by adding an outboard current boost transistor to the circuit it becomes possible to upgrade the regulator circuit to handle much higher currents, and upto any desired levels. You might have already come across the 78XX fixed voltage regulator […]

Filed Under: Power Supply Circuits Tagged With: Boost, Current, LM317, Outboard

Make this 3.3V, 5V, 9V SMPS Circuit

Last Updated on January 8, 2024 by Swagatam 29 Comments

smps 2

Here I have explained about a simple switch mode power supply (SMPS) circuit which is capable of delivering 3.3V, 5V, 9V at around 800mA from a Mains input range of 100V to 285V, with a complete isolation. The functioning of the proposed 3.3V, 5V, 9V flyback SMPS Circuit may be understood by going through the […]

Filed Under: Power Supply Circuits Tagged With: SMPS

What’s Ripple Current in Power Supplies

Last Updated on January 8, 2024 by Swagatam 1 Comment

ripple

In this post I have explained regarding what’s ripple current in power supply circuits, what causes it and how it can be reduced or eliminated using smoothing capacitor. What’s Ripple in Power Supply Circuits In all AC to DC power supplies the DC output is acquired by rectifying the AC input power and filtering through […]

Filed Under: Power Supply Circuits Tagged With: Current, Power, Ripple, Supplies

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

How Wireless Power Transfer Works

Last Updated on August 29, 2019 by Swagatam 41 Comments

wireless2Bpower2Btransfer 1

Wireless power transfer is a process in which electrical energy is transferred from one system to another system through electromagnetic waves without using wires or any physical contact. In this post I have explained regarding how wireless power transfer works or the transfer of electricity through air without using wires. You might have already come […]

Filed Under: Electronics Theory, Power Supply Circuits Tagged With: Power, Transfer, Wireless, Works

Adjustable 3V, 5V, 6V, 9V,12V,15V Dual Power Supply Circuit

Last Updated on September 16, 2023 by Swagatam 36 Comments

LM3172BPOWER2BSUPPLY

The purpose of this paper is to detail a variable dual lab power supply circuit which has an adjustable range from 3V, 5V, 6V, 9V, 12V, and 15V or even more at an output current rate of 1 amp. Written By: Dhrubajyoti Biswas The Dual Power Supply Concept In regard to positive volt it is […]

Filed Under: Power Supply Circuits Tagged With: 12V, 15V, Adjustable, Dual, Power, Supply

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