bench power supply unit from scratch

8/17/2019 Bench Power Supply Unit From Scratch

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2/18

In this instructable I am going to show you how to make a bench power supply. The

bench power supply would consist of 6 fixed voltages and a variable voltage from 7vto 1v

(http://cdn.instructables.com/FQQ/W1IB/I84BC3UR/FQQW1IBI84BC3UR.LARGE.jpg)

(http://cdn.instructable s.com/F59/5QAC/I85QOIX2/F595QACI85QOIX2.LARGE.jpg)

(http://cdn.instructables.com/F4M/NKZ8/I84BC2RH/F4MNKZ8I84BC2RH.LARGE.jpg)

About This Instructable

License:13,751 views

306 favorites

aurushTheMaker

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3/18

Power supply

Jaring & BoxGrosir ps supply jaring & box

murah 5 A 10A 15A 20A 30A

untuk CCTV

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Step 1: What is a bench power supply and why do I need it ?

(http://cdn.ins tructables.com/FM1/PWN7/I85QOGTU/FM1PWN7I85QOGTU.LARGE.jpg)

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4/18

A bench power supply is a very important and useful tool in electronics. You may

not understand the importance of i t until you make one or use one. The same was

my case as I found it useless until I made one and millions of new possibilities

opened up.

Basically a bench power supply is a tool through which you can get multiple

voltages. So the bench power supply that we will make today will have

12v,10v,9v,8v,6v,5v and a variable supply ranging from 7v to 1v.

Step 2: MATERIALS REQUIRED

Related

See More (/tag/type-id/?q=)

(http://cdn.instructables.com/F6U/024O/I8011B4F/F6U024OI8011B4F.LARGE.jpg)

Perfect lab bench power

supply

(http://www.instructables.c

lab-bench-power-supply/?

Bench Power Supply from

old Laptop Power

Supplies


A simple 4 - channel

adjustable curre nt source


simple-4-channel-

Homemade LM317 Bench

Power Supply


LM317-Bench-Power-

Variable Power Supply


Power-Supply/?

utm_source=base&utm_m

http://cdn.instructables.com/F6U/024O/I8011B4F/F6U024OI8011B4F.LARGE.jpghttp://www.instructables.com/id/Homemade-LM317-Bench-Power-Supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/member/WWC/http://www.instructables.com/id/A-simple-4-channel-adjustable-current-source/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/member/Wizzkid1984/http://www.instructables.com/id/Homemade-LM317-Bench-Power-Supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/id/Perfect-lab-bench-power-supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/tag/type-id/?q=http://www.instructables.com/id/Bench-Power-Supply-from-old-Laptop-Power-Supplies/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/id/Variable-Power-Supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/id/A-simple-4-channel-adjustable-current-source/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/member/abizar/http://www.instructables.com/member/chelseabun/http://www.instructables.com/member/damcave/http://www.instructables.com/id/Bench-Power-Supply-from-old-Laptop-Power-Supplies/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/id/Perfect-lab-bench-power-supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_testhttp://www.instructables.com/id/Variable-Power-Supply/?utm_source=base&utm_medium=related-instructables&utm_campaign=related_test


5/18

A wide range of materials would be required for making this project and you should

spread the work in one day to get better results.

So without further ado the materials are

•Enclosure for the projects

• Power supply(as I didn't want to do AC to DC conversation I simply used a 12v

wall vort)

(http://cdn.instructable s.com/FKS/FZXZ/I8011B7F/FKSFZXZI8011B7F.LARGE.jpg)

(http://cdn.instructables.com/FGR/1HIQ/I84BBPRH/FGR1HIQI84BBPRH.LARGE.jpg)

http://cdn.instructables.com/FKS/FZXZ/I8011B7F/FKSFZXZI8011B7F.LARGE.jpghttp://cdn.instructables.com/FGR/1HIQ/I84BBPRH/FGR1HIQI84BBPRH.LARGE.jpg


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•7805

•7806

•7808

•7809

•7810

•LM 317

• 5k ohm pot

• 220 ohm resistor • 0.1uf cap

• 1 uf cap

• banana clips male

• banana clips female

• switch

•voltmeter( buy voltmeter from ebay (http://www.ebay.com/itm/NEW-Red-LED-

Panel-Meter-Mini-Digital-Voltmeter-DC-0V-To-99-9V-/130705813566?

pt=LH_DefaultDomain_0&hash=item1e6eac703e) )

The tools required for the build are• Soldering iron

•Solder

•Dremel or cutting tool

• A day or 2

you can get all the materials in about 5$ to 10$ depending on the place you live in.

Step 3: MAKING THE LM317 VARIABLE VOLTAGE

REGULATOR

(http://cdn.ins tructables.com/F4F/MKW2/I84BBPY4/F4FMKW2I84BBPY4.LARGE.jpg)

http://www.ebay.com/itm/NEW-Red-LED-Panel-Meter-Mini-Digital-Voltmeter-DC-0V-To-99-9V-/130705813566?pt=LH_DefaultDomain_0&hash=item1e6eac703ehttp://cdn.instructables.com/F4F/MKW2/I84BBPY4/F4FMKW2I84BBPY4.LARGE.jpg


7/18

You can follow the schematics given above and make the circuit . If you are not

well versed with reading schematics check this out reading schematics

(https://www.google.co.in/url?

sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0CDAQFjAD&ur

l=http%3A%2F%2Fmakezine.com%2F2011%2F01%2F25%2Freading-circuit-

diagrams%2F&ei=TFkeVdKaFIy0uASU_oHQBw&usg=AFQjCNGAonRO7wcrQ7wW

3LrT1eYbtKnsJw&sig2=rhLvME7vsUtR_0C0r03LmA&bvm=bv.89947451,d.c2E)

After you have the circuit on the purf board you can test it with a multimeter. DO

NOT TEST IT WITH THE VOLTMETER as the max voltage on the voltmeter is 9 v

and u will have tho test it through the 7808 the 8v regulator.

We will be doing the same in the power supply as to get 7 volts max.

Step 4: MAKING THE OTHER FIXED VOLTAGE OUTPUTS

(http://cdn.ins tructables.com/FSG/ISMX/I8010V0N/FSGISMXI8010V0N.LARGE.gif)

BENCH POWER SUPPLY UNIT FROM SCRATCH by PaurushTheMaker (/member/PaurushTheMaker/)

Collection I Made it!

Vote!

Download (/id/BENCH-POWER-SUPPLY-UNIT-FROM-SCRATCH/?download=pdf)

7 Steps

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8/18

(http://cdn.instructables.com/FRC/I06F/I84BBPBI/FRCI06FI84BBPBI.LARGE.jpg)

(http://cdn.ins tructables.com/F74/ETKB/I84BBPEA/F74ETKBI84BBPEA.LARGE.jpg)

(http://cdn.instructables.com/F0I/07PS/I84BBPBR/F0I07PSI84BBPBR.LARGE.jpg)

(http://cdn.instructables.com/FC9/UV9Q/I84BBPLR/FC9UV9QI84BBPLR.LARGE.jpg)

(http://cdn.instructables.com/FJU/NZ49/I84BBPI4/FJUNZ49I84BBPI4.LARGE.jpg)

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9/18

For making the fixed voltage outputs, solder all the voltage regulators directly on the

board without putting them through as the thickness of the pins is very large. then

give the 12v to the input pin and ground to the ground to all the voltage regulators. I

put the 7808 or the 8v regulator directly into the LM317 circuit.

The outputs of these regulator would be used later to connect them to the banana

clips.

Step 5: PREPARING THE ENCLOSURE

(http://cdn.ins tructables.com/FRR/40IT/I84BBPMK/FRR40ITI84BBPMK.LARGE.jpg)

(http://cdn.instructables.com/FJX/41OO/I84BBQIB/FJX41OOI84BBQIB.LARGE.jpg)

http://cdn.instructables.com/FRR/40IT/I84BBPMK/FRR40ITI84BBPMK.LARGE.jpghttp://cdn.instructables.com/FJX/41OO/I84BBQIB/FJX41OOI84BBQIB.LARGE.jpg


10/18

For preparing the enclosure first put white tape all over the enclosure. then make

the required markings and cut them using the dremel or the cutting tool. You may

have to use the sanding tip also to clean the edges and give a good fit.

the enclosure is the major part and should be done with the most carefulness.

The holes for the banana clips can be drilled with the appropriate drill bit and can

be screwed on well. Don't apply force on the plastic as it may break as it is very

brittle.

Step 6: WIRING IN THE ENCLOSURE

(http://cdn.instructables.com/FCL/OZKN/I84BBPOC/FCLOZKNI84BBPOC.LARGE.jpg)

(http://cdn.instructables.com/FCJ/TKFD/I84BBQTF/FCJTKFDI84BBQTF.LARGE.jpg)

(http://cdn.instructables.com/F02/TUBO/I84BBPPT/F02TUBOI84BBPPT.LARGE.jpg)

(http://cdn.instructables.com/FYV/22SP/I84BBPRE/FYV22SPI84BBPRE.LARGE.jpg)

(http://cdn.instructables.com/FLI/7CW0/I84BBPOU/FLI7CW0I84BBPOU.LARGE.jpg)

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11/18

After the banana clips are fixed in the enclosure put in the 2 pcbs and wire the

connections. The first clip is the variable clip and then followed by 12v,10,9v,8v,6v

and 5v.

The voltmeter has three wires - one white,one red and one black. The black one is

for the ground the,red is for the vcc or the positive terminal which can directly be

connected to the 12v from the adapter. The white line goes to the output of the

(http://cdn.instructables.com/F8R/NH7E/I84BBR7D/F8RNH7EI84BBR7D.LARGE.jpg)

http://cdn.instructables.com/F8R/NH7E/I84BBR7D/F8RNH7EI84BBR7D.LARGE.jpg


12/18

LM317 circuit.

A black banana clip is connected to the ground.

Step 7: CLOSING THE ENCLOSURE

The last step is to close the enclosure. If you have access to a multimeter then test

all the connections before switching on and also check the output from each clip.

Isolate all the electronics and put the screws in the holes and close the box.

NOW YOUR POWER SUPPLY IS READY

(http://cdn.instructables.com/F58/1QBA/I84BBVFK/F581QBAI84BBVFK.LARGE.jpg)

http://cdn.instructables.com/F58/1QBA/I84BBVFK/F581QBAI84BBVFK.LARGE.jpg


13/18

We have a be nice comment policy.

Please be pos itive and constructive. I Made it! Add Images Make Comment

(/member/arvevans/)

2 hours ago Reply


2 hours ago Reply

(/member/VladM3/)

1 hour ago Reply

arvevans (/member/arvevans/)

Several people have commented regarding possible over-current problems.

These 3-terminal regulators have internal current limiting that protects them fromburnout, but they do need a heat sink if operated near full power.

Using a wall-wart to power the unit usually will limit currents to safe values

because Class-2 devices have inherent current limiting in the transformer...but not

always.

A string of solar cells and battery to power this might be interesting for portability,

PaurushTheMaker (/member/PaurushTheMake r/) (author) arvevans

Thanks a lot

it ends my problem to explain to all as you have doneit so well

VladM3 (/member/VladM3/)

I really like the simplici ty of this bench power supply. I can't wait to try it out. I'm

watching out for version 2 ;).

I like the suggestions down below for version 2... Having the capacity for more

current is a big one for me.

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14/18

(/member/RayKenn/)

5 hours ago Reply


2 hours ago Reply

(/member/Hallofo/)

4 hours ago Reply


2 hours ago Reply

(/member/bryan.reid.585/)

5 hours ago Reply

RayKenn (/member/RayKenn/)

Thanks for posting this. I need one in my shop.

PaurushTheMaker (/member/PaurushTheMake r/) (author) RayKenn

surely do share it with me

also ask me any queries

Hallofo (/member/Hallofo/)

Awesome build! It looks like I have a new item on my to-do list. One question: did

I miss the part where you put in a fuse, or is that a "Version 2" thing?

PaurushTheMaker (/member/PaurushTheMake r/) (author ) Hallofo

You dont need a fuse as you are using a wall adapter

and not doing the AC to DC conversion but if youwant to try that it is all up to you.

also i have tried connecting the positive and negative

together many times sometimes deliberately also

and the result was that the adapter switched off.nodamage. fuse is not really required if you are using a

adapter.

bryan.reid.585 (/member/bryan.reid.585/)

Hmmm directions are pretty sketchy. You show lots of detail on the soldering of

the various voltage regulators, drilling the enclosure but little on how theelectronics are connect to the banana clips, the display, the switch, pot, resistor,

etc etc... So I can understand why some of your viewers can't follow you

directions. Could you provide a little more detail?

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15/18


2 hours ago Reply

(/member/MichaelF20/)

18 hours ago Reply


15 hours ago Reply

(/member/ac-

dc/)

2 hours ago Reply

PaurushTheMaker (/member/PaurushTheMake r/) (author) bryan.reid.585

Surely I will work on it

But if you need something specific i will send it to you

MichaelF20 (/member/MichaelF20/)

Good beginning, but might not allow for much current draw without burning outyour transistors. Have you considered making a PWM based unit with a 555timer and larger transistors to handle more current?

PaurushTheMaker (/member/PaurushTheMake r/) (author) MichaelF20

Surely Michael I agree to you as the max current

output is only 1.5 amps on the lm317. we can makea 555 pwm but I think there would be many other

solutions also that I would like to check out. Thanksfor your input and to tell you I plan to make another power supply which would be more efficient maybe

a boost power supply.

But anyways thanks a lot

ac-dc (/member/ac-dc/) PaurushTheMaker

No! Your max current is significantly lower. Because the regulators do not

have heatsinks they are limited to about 1W maximum loss (as heat) for

long life. This is the inherent drawback of linear regulators, that all voltageis lost as heat.

If your AC-DC adapter is regulated so it is actually 12V instead of a

higher float voltage around 15V (which would make matters even worse)

then the math is as follows:

7805: 12V - 5V = 7V drop, 1W / 7V = 143mA max7806: 12V - 6V = 6V drop, 1W / 6V = 167mA max

7808: 12V - 4V = 4V drop, 1W / 4V = 250mA max

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16/18

(/member/charitakudzwa/)

7 hours ago Reply


7 hours ago Reply

(/member/dmwatkins/)

7 hours ago Reply


7 hours ago Reply

7809: 12V - 9V = 3V drop, 1W / 3V = 333mA max

7810: 12.V - 10V = 2V drop, 1W / 2V = 500mA max

LM 317: Depends on its setting, 12V - (n)V = ?, 1W / ? =

Using heatsinks would significantly increase these values but then atsome point for continuous operation you would also want to put vents, or

perhaps even active cooling in the project box.

Frankly if you do not need multiple outputs simultaneously I would get rid

of all the regulators except the LM317 and put a larger heatsink on it, or

use two LM317 for dual variable outputs, then either a 2nd LED voltagedisplay or a toggle switch to change which output the display is showing

for adjustment purposes.

charitakudzwa (/member/charitakudzwa/)

oh man that was cool i tried to make it ; but mine did not work

PaurushTheMaker (/member/PaurushTheMake r/) (author ) charitakudzwa

why that's sad

tell me the problem I may be able to find a solutionpost the problem here or mail i t to me

dmwatkins (/member/dmwatkins/)

...and yours looks a whole lot nicer than mine!

PaurushTheMaker (/member/PaurushTheMake r/) (author ) dmwatkins

another nifty trick

I wasn't able to fit the adapter through the hole in my

desk so I cut it and put 3 female headers and 3 maleheaders in each end and put ground in the middle

and vcc on the opposite ends

makes it very easy to put in and to carry

http://-/?-http://www.instructables.com/member/PaurushTheMaker/http://-/?-http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/dmwatkins/http://www.instructables.com/member/charitakudzwa/http://www.instructables.com/member/dmwatkins/http://www.instructables.com/member/charitakudzwa/http://www.instructables.com/member/PaurushTheMaker/


17/18


7 hours ago Reply

(/member/dmwatkins/)

7 hours ago Reply


7 hours ago Reply

(/member/peabody1929/)

14 hours ago Reply


13 hours ago Reply


thanks i t makes i t very easy to carry around

dmwatkins (/member/dmwatkins/)

Excellent build and write-up! I made a small one and stuck it to the top of my

breadboard. One thing I included that you might find useful is a 555 square-wavegenerator. I used an 6-position rotary switch with various capacitors to be able toset a clock signal from 1 Hz to 100 kHz in powers of 10. Very useful when

working with ICs that need to be clocked.


thanks man cool will surely try it in version 2. You

people are all the more promoting me to make

version 2.keep an eye on my page for it and thanks a lot again

peabody1929 (/member/peabody1929/)

One can find a LM2596 adjustable PWM dc - to - dc converter module with 3Aoutput on eBay for as little as $0.99.

PaurushTheMaker (/member/PaurushTheMake r/) (author) peabody1929

thanks Peabody for the informationwill help a lot in bench power supply version 2

http://-/?-http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/peabody1929/http://-/?-http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/PaurushTheMaker/http://www.instructables.com/member/dmwatkins/http://-/?-http://www.instructables.com/member/dmwatkins/http://www.instructables.com/member/peabody1929/


18/18

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