Introduction: 5v Regulator

Picture of 5v Regulator

5v volt regulator circuit which can be made from only three components, its simple, cheap and easy way to get a current up to 1A and a voltage of more than 5v can only be regulated by this circuit, this circuit can be used as a bread board power supply

Step 1: Components

Picture of Components

1.............. L7805

heat sink ( a small aluminium plate from scrap)

1...............10uf 25v (electrolytic capacitor)

1................1uf 25v(electrolytic capacitor)

green LED (optional)

1k resistor(brown black red) (optional)

soldering iron


common circuit board

Step 2: Circuit Diagram

Picture of Circuit Diagram

this is the circuit diagram of the regulator, i have added a green led in series with the 1k resistor to know whether the circuit is working, (the part is optional ) a voltage between 7v to 15v 1A current  can be given as the input.

Step 3: Steps

Picture of Steps

assemble the transistor and the capacitors according to the circuit diagram in a common circuit board 

Step 4: Conclusion

most of the mistakes are formed due to poor soldering and the mistake in connecting diodes. always double check the capacitors are connected in forward bias since it explodes when reverse biased in case of electrolytic capacitor
hope this circuit will be used by the members, and if so i will bring more circuits 


AnandA18 (author)2016-06-02

Hey Guys I'm working on a project that electricity by walking! In this project actually I insert a Piezoelectric transducer in soles of our shoes and then convert this electricity produced from AC to DC. After converting this current to DC when I walk sometimes I get upto 31v So I would like to know if this circuit is recommended for this project and if not pls suggest me another circuit with its circuit diagram And pls Its my sincere request.

Adityan A

KasunJ (author)AnandA182017-08-13


super great idea bro!!!

AngelM104 (author)2016-09-10

your out put is 5v andhow many ampere?

KasunJ (author)AngelM1042017-08-13

2A is a too much for such small device unless you have exactly higher voltage as same as the dropout voltage of this ic.:)

tomstorey (author)AngelM1042017-03-02

Check the datasheet of the regulator that you use as it can vary and/or find one with the required output current.

For example, you can find anything from 100mA in a TO-92 package, to 2A in TO-220, and various others in between, and probably more either side.

MhmdG (author)2017-03-20

hello , i have 52 to 44 volts , and i want to use 5 v regulator, what size of the capacitor should i use ??

KasunJ (author)MhmdG2017-08-13

you cant either you have a 35v supply.because these linear regulators has a voltage drop across it so when Vin and Vout difference getting higher the power dissipation will be higher too.its just waste of could use a buck converter. :)

HugeMofo (author)MhmdG2017-04-11

The L7805 has a maximum input of 35V. You will need to reduce your voltage before applying up to 35V to the IC.

asimmo65 (author)2017-06-04

can someone help me design a specific circuit for my project. I can pay.

sooraj619 (author)asimmo652017-08-08

what kind of circuit are u opting for?

sooraj619 (author)asimmo652017-08-08

what type of circuit are u opting for?

AibalJ (author)asimmo652017-08-01

i will be there to help

iven86 made it! (author)2016-06-03

can you help please??

DanteM13 (author)iven862016-10-02

Im just curious, but why have you put the capacitors positive side to minus??? Thats wrong! ;D

ManishP54 (author)2016-06-15

design a analog circuit that if capacitor value is below 6V then output pulse come. input 10V

JamesC_1700 (author)2016-05-27

how can you tweak this cicruit in order to produce lesser current. I need 5v and 400 ma output. Should I get another capacitor with different capcitance, if so what?

KiadyR (author)2016-05-26


can you tell me which regulator i have to use if i have to drop from 19v to 16v 3.5A

BunceyTheInbred (author)2016-03-02

I can only find 50V 1uF capacitors online

If you're still curious, 50V is the MAXIMUM that the capacitor can handle, it can run at much lower voltages ie. it'll work perfectly fine for this purpose. Try this website for your various electronic needs, it's already linked to capacitors (no I'm not sponsoring/promoting them, just saying it's a good place for parts).

You are amazing! I thought nobody would get back to me. Thank you very much for the help, people like me just get lost on the most simple of electronics ;)

UzairA13 (author)2016-02-26

i have create a power supply for mobile charging using 12 volt transformer 1A c and 7805 regulator . the circuit is ok . but i apply the load to the circuit the voltage are reduce from 5 volts to 3 volts and mobile phone is not charge ....... any one help me

sudheesh_sudhi (author)2016-02-08

what is the output current of the circuit?

Muhammad BilalA (author)2016-01-04

What wud happen if i supply 24 V ????

AliW13 (author)Muhammad BilalA2016-02-02

it will work

nfrost4 (author)2015-12-01

If i connect so , on giving 5volt will the output will be 5v or will there be a drop

llldodgelll. (author)nfrost42015-12-31

There will be a voltage drop. Usually, you need to supply 7vdc minimum to get reliable 5vdc out. Look up the datasheet of your particular regulator for specs.

bastynator made it! (author)2015-11-28

Thanks for the instruction, this helped me a lot

Arun Krishna (author)2015-09-11

DrMaker (author)2015-08-16

Hi, there is a little mistake on the first image.

It says L7805 transistor and should be L7805 Voltage Regulator.


VandanaS1 (author)2015-08-05

larsje390 (author)2015-06-29

Hello nice project, but I have one question

What happens when the original battery voltage drops below five volts? will it still output that lower voltage or nothing at all?

mohamedn11 (author)larsje3902015-07-10

The voltage regulator doesn't work if the input is less than 6V (this value varies with the manufacturer) and can hold upto a maximum of 35V. But coming to your question, what will be the output if it is less 5V?

The voltage regulator, basically dissipates energy to achieve its function. And since the input is less than what is recommended, some energy is lost in its circuitry and the output is much less than the input. eg. if I give 5V to the input, some energy is lost inside and the output would be around 1.7-2V .

GuoJ (author)2015-06-16

hi what if i have a 24v and i want to convert it to 5v

sooraj619 (author)GuoJ2015-06-22

SchwettyBawls (author)2015-05-13

I plan to make something like this to power a Raspberry Pi B+ in my car. What regulator would I need to supply 5v 2amp output. Sadly the L7805 just doesn't have the amps I need.

sooraj619 (author)SchwettyBawls2015-06-15

Doc Cox (author)2015-05-19

Thank you for this circuit, just what I was looking for to charge lithium batteries, regards Doc Cox

sooraj619 (author)Doc Cox 2015-06-13


CongN1 (author)2015-05-16

Can i use it with a 12V-5A to step down for 5v-1A DC , 5A to 1A ? the power supply current can be affect or not ? i think i do affect , doesn''t it ? because i''ve alreay had a 12V-5A DC and want a 5V-1A for my device !

sooraj619 (author)CongN12015-06-13

the output from the circuit is 5v 1A. if you give 12-5A as input the heat sink size used for the 7805 IC should be increased as it gets more hot.

keesv1 (author)2015-06-07

Just let a volregulator drive a fet or and use a zener and a shunt resistor or better, just read the millions of articles about the most used voltage regular serie in the word, from 1976. But don't expect high end superstable low noise, low quiscent currents(warmth). This is the most standard 'schematic' possible and a filmcapacitor couldn't hurt neither then a cheap elco and you can never drive a voltage regulator like this one, with a lower input voltage then the output .They are not efficient and need power to maintain the output voltage and current. And switching 12 v 5a are more efficient parts for on the market, redcon makes good ones, but i think you mean that your powersupply is able to give max 5A , why would you else want 1A. analogue devices has a lot of articles (and very nice components) on their website.and the max amperes a 7805 can draw, i've seen was 2,5A , but the most 1 to 1,5 A With a coolblock. If you want more power and be able to adjust the adjust the output voltage take this one with a lotttt of schematics, included formula.... goodluck

NiranjanS1 (author)2015-03-31

can i use this regulator to regulate 3v to 5v

MtuBoy (author)NiranjanS12015-04-19

Hi NiranjanS1. The regulator does not 'stepup' voltage. It's only used to regulate voltage downwards.

dubnikov (author)2015-04-01

And what maximum input voltage L7805 can handle?

Mërgim Halimi (author)2015-03-11

Hi, thanks for sharing, Can I use an input of 24v and still in the output stay in 5v, if No what should I do, change the transistor or the capacitor values ?

HI, If you look at the link below you'll see a great write-up about this particular regulator. But for the short answer it will work but it'll throw out more heat. The closer the source voltage to the output the less heat there will be. Make sure you have adaquate cooling!

Xyiro (author)2014-10-15

Hey ! to all instructablers out there

I was just wondering if it is ok to use two 70 microfarad capacitors .

Thanks, your replies are appreciated

TommyT1 (author)Xyiro2014-11-21

long story yes with an if...

short story no with a but!

the circuit is designed with a large and tiny capacitor. you could have a 900 microfarad capacitor before but you must have a less then 2 MF capacitor after

Must have <2uf after... Thanks for the info, but a reason or reference would be much appreciated... surely larger is better? Or does a larger cap take longer to charge causing hysteresis?

Xyiro (author)TommyT12014-11-22


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