Variable voltage and current power supply circuit

This is high current adjustable power supply ,to 30V 20A or 400watts. It easy circuit and nice circuit , Because use IC-LM3and IC-7as main parts Many electronics circuits and projects for learning in simple ways. Variable Voltage Power Supply Circuit We can improve our basic voltage regulator circuit a little more by connecting an Ammeter and a Voltmeter to the output terminals. These instruments will give a visual indication of both the current and voltage output from the variable voltage regulator.

This power supply deliver a cc voltage adjustable between and 30V , a current.

This simple variable power supply circuit has a low production cost and delivers an output voltage between 5. This is the most useful equipment for a hobbyist and DIY maker cause while making or testing circuits , it. Power supply is based around a LM7voltage. If you want to a LM3variable dc voltage power supply circuit during 1. V to 30Vdc and can provide a current maximum to 5A.

Variable power supplies are available in different ranges but they provide very low current of one or two amperes, they can’t drive high power devices like motor or high power lamps. This is a high quality power supply with a continuously variable stabilised output adjustable at any value between and 30VDC.

The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few mill. Another method of using opamps to regulate a power supply is shown below. The input supply source is connected across the Vin and ground of the upper current regulator circuit , the output from this stage goes to the input of the lower LM3variable voltage regulator stage.

The power transformer requires an additional winding to supply the op-amps with. Basically both the stages are connected in series for implementing a complete foolproof voltage and current regulation for the connected load which is a laser diode in the present case. The AC supply is fed to the transformer which is stepped down to 12V AC. The design of a power supply circuit is a step by step process involving stepping down AC voltage , converting AC voltage to DC voltage , Smoothing DC voltage , Compensating transient currents, Voltage regulation, Voltage variation and Current amplification and Short circuit protection.

DIY simple and useful circuit for variable voltage and variable current power supply. This circuit can deliver - amps and a more short term. Variable voltage power supply is essential for any electronic hobbyist to begin their electronics lessons. For different applications you may need different voltages.

So it becomes impossible to use multiple fixed power supplies all the time. Short Circuit , Current Limitation protection. Notes Using the versatile L2voltage regulator, this power supply has independent voltage and current limits. The mains transformer has a 12volt, amp rated.

The most important part of this circuit is the 3variable voltage regulator.

The 3is a monolithic integrated circuit with adjustable 3-terminal positive- voltage regulator designed to supply more than 1. A of load current with an output voltage adjustable over a 1. It also comes with internal current limiting, thermal shutdown, and safe area compensation. Potentiometer Rwas adjusted to set the current limit a little above A. Well suited to supply the circuits shown in this website. You can adapt it to your own requirements as explained in the notes below. My input is a laptop power supply rated 19. Looking at the proposed high current LM3regulator circuit design we can see how the basic LM3variable power supply design which is normally rated to deliver.

Hi all, I'm starting out and would like to build myself a variable bench power supply that keeps current to a maximum of 1A and voltages anywhere between 0V and 30V. A variable bench power supply is the most important tool for any DIY maker cause while testing circuit it needs different values of voltage and current.