# Voltage Regulator Circuit-The Big List

jojo April 2, 2012 11 Comments

Over years we have published a handful of voltage regulator circuits in this website – which serve many purposes. In this article I am compiling a quick list of the best voltage regulator circuits that will be useful for all of you. The term “Voltage Regulator” is some what general in nature – it can be an AC-AC regulator or a DC-DC regulator. Basically what it does is simple – it regulates and maintains a desired voltage level as constant at the output terminals. So let’s start to dig down our big list 🙂

6 Volt regulator using 7806

This is an easy to build circuit using IC 7806 (which is a 3 terminal positive voltage regulator). The circuit is designed such a way that 230 volts mains is step down to 9 volts using a transformer and is then regulated to 6 volts output. This IC is a stable one with internal current limiting and thermal shut down. It can give more than 1 A current output, if proper heat sink is used.

Linear voltage regulators are power inefficient as they dissipate lots of power in the form of heat. To solve such power efficiency problems, we can use a switching regulator which can save up to 85% of power compared to a linear regulator. Here we have a circuit using LM317 IC – which is a switching voltage regulator and it can deliver upto 3 Amperes of current. The switching regulator operates by taking small bits of energy from the input voltage source and then transferring it to the output with the help of a solid state switch and a control circuitry.

9 Volt regulator using 7809

Adjustable Voltage regulator circuit using LM317

Well, this is a collection of voltage regulator circuits韦德体育投注网是什么,韦德体育app using the LM317 IC – which is an adjustable voltage regulator. LM317 is a three terminal adjustable regulator from National semiconductors and it’s input can range up to 40 volts. The output voltage can be adjusted from 1.2 V to 37 V. Now this article is a collection of 4 circuits using LM317.

1. A general positive voltage regulator – The output voltage can be adjusted by varying the pot and resistor. There is an equation given to calculate V0ut.

2. Adjustable voltage regulator circuit – where the output voltage can be selected digitally. This circuit is nothing but a simple modification of the conventional voltage regulator circuit using LM317. Here instead of a pot, 4 resistors are connected in parallel which are activated only by the associated transistors. Thus each transistor acts as a logic level and is turned on or kept off. By selecting transistors and turning it ON – output voltage level can be adjusted.

10 Ampere Adjustable voltage regulator using MSK5012

12 Volt regulator using 7812

So here is a really powerful 12 Volt regulator using IC 7812 which can deliver upto 15 Amperes of current. The 7812 regulator is used to maintain output at 12 volts and three TIP 2599 transistors are used to boost current. This is a costly circuit because of the high power components used. So assemble only if you are in need of one.

12 volt regulator using Zener diode

So here comes the first zener controlled voltage regulator.  So this circuit is a really simple and easy to assemble type using a Zener and a series pass transistor (2N3055). It can deliver an output current upto 3 Amperes. When you use zener diode as voltage regulator, theoretically you will get 0.7 volts less at output. In this case – 11.3 volts.

2 volts to 37 volts Adjustable voltage regulator using LM723

Voltage regulator using LM723 IC – which is linear regulator from National semiconductors. The input can be upto 40 volts and it’s output can be adjusted from 2 volts to 37 volts. Without any adjustments, the IC can deliver upto 150mA current and further improvements in current can be attained by adding a series pass transistor – in our case MJ3001 a Darlington transistor.

13 volts 5 Ampere Adjustable voltage regulator using LM338

LM338 IC is made from the house of ST Microelectronics. The IC has time dependent current limiting, thermal regulation and is available in 3 lead transistor package. The LM338 has an output voltage range between 1.2V and 30V and it can deliver output current well over 5 Ampere. R1 and R2 is adjusted to program the desired output voltage.

25 volts Adjustable regulator using LM117

A collection of Switching regulators

3 Ampere regulator using LM350

12 volts boost converter circuit using LM2698

Adjustable voltage regulator circuit using L200

Another simple circuit using monolithic integrated adjustable voltage regulator IC L200.  This IC has features like current limiting, thermal shut down, power limiting, input over voltage protection etc. Resistors R1 and R2 must be adjusted to get the desired output voltage. We can get an output of 2.8 volts to 15 volts at 1 Ampere current.

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• December 31, 2014

• Jerin
June 27, 2014

Hi, please suggest a simple circuit to get 5V 2A DC from 30V DC.

• mutai leon
February 16, 2014

Hi, i need a circuit that can convert a voltage variation of 0-24volts to 0-5volts so that i can use it as an input to a micro-controller. regards.

• Ray Freeman
October 8, 2013

Hoping you can help me
I have a Hawkins 224 pro 12/24 volt battery charger which is meant to charge wet cell batteries only as it puts out 13.4 volts, now I have changed over to AGM batteries the charger puts out 17.5 volts which is too high and will shorten the life of the battery, so the question is would it be possible to use a 12 volt regulator to control the 224 pro from putting in 17.5 volts and only put in 14.2 which is ok for AGM batteries and how would I go about it.
Regards
Ray

• anand jayawant
March 31, 2013

韦德体育投注网是什么,韦德体育appgood collection of circuits

• December 3, 2012

its so eaisy sir

• November 6, 2012

i need more