Build Your Own Variable Lab Bench Power Supply

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Introduction: Build Your Own Variable Lab Bench Power Supply

About: Awesome Electronics Tutorials, Projects and How To´s

In this project I will show you how I combined a LTC3780, which is a powerful 130W Step Up/Step Down converter, with a 12V 5A power supply to create an adjustable lab bench power supply (0.8V-29.4V || 0.3A-6A). The performance is quite good in comparison with other models which cost around the same. Let's get started !

Step 1: Watch the Video !

The video gives you all the information you need to build this correctly. But I will also present you a parts list and more pictures for convenience.

Step 2: Order Your Parts !

Here is the parts list with example sellers (affiliate links):

Ebay:

1x LTC 3780: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 12V 5A Power Supply: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x AC Input: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x AC Switch: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Voltage/Current Display: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x Binding post: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 200kΩ Potentiometer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 500kΩ Potentiometer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x Knobs: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Aliexpress:

1x LTC 3780: https://s.click.aliexpress.com/e/_dUULcjH

1x 12V 5A Power Supply: https://s.click.aliexpress.com/e/_d6OKO63

1x AC Input: https://s.click.aliexpress.com/e/_d6rs11H

1x AC Switch: https://s.click.aliexpress.com/e/_d8ahMCn

1x Voltage/Current Display: https://s.click.aliexpress.com/e/_dTLhigJ

2x Binding post: https://s.click.aliexpress.com/e/_dTyymFV

1x 200kΩ Potentiometer: https://s.click.aliexpress.com/e/_d6mRdPZ

1x 500kΩ Potentiometer: https://s.click.aliexpress.com/e/_d6mRdPZ

Amazon.de:

1x LTC 3780: -

1x 12V 5A Power Supply: http://amzn.to/1FIc4vK

1x AC Input: http://amzn.to/1FIc7b5

1x AC Switch: http://amzn.to/1FIceDs

1x Voltage/Current Display: http://amzn.to/1AwUnt8

2x Binding post: http://amzn.to/1ENKLzo

1x 200kΩ Potentiometer: http://amzn.to/1ENKQmP

1x 500kΩ Potentiometer: http://amzn.to/1AwUEfD

2x Knobs: http://amzn.to/1FIcuCC

Amazon.co.uk:

1x LTC 3780: -

1x 12V 5A Power Supply: http://amzn.to/1FId7fh

1x AC Input: http://amzn.to/1R1lRl9

1x AC Switch: http://amzn.to/1AwWsoT

1x Voltage/Current Display: http://amzn.to/1AwWFsa

2x Binding post: http://amzn.to/1ENM3uh

1x 200kΩ Potentiometer: http://amzn.to/1FIdAyb

1x 500kΩ Potentiometer: http://amzn.to/1FIdBSx

2x Knobs: http://amzn.to/1AwXvoY

Step 3: Build It !

Here are some picture which should hopefully help you to build your own supply. And be careful when working with mains voltage !

Step 4: Success !

You did it! Now you have successfully built your own variable lab bench power supply!


Feel free to check out my Youtube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

23 People Made This Project!

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224 Discussions

0
TurkelA
TurkelA

Question 8 months ago

Hi Scott, I am big Fan of your youtube channel and instructions :)
I would like a bit modify current setup to use with my "3A 12V toroidal transformer" and "LM317 Adjustable Regulated Rectifier Filter". then connect LM317 directoly to LTC3780.
Will this setup work OK? The purpose is to build Liniar Power Supply rather than switching one.

Grate Thanks,
Turkel.

0
nickr20215
nickr20215

Answer 4 months ago

yes as long as it's not over 12v

0
MathieuC35
MathieuC35

5 months ago

Hello. I'm a little confused. My display does not look exactly like the one in the pictures. The power wires are thin and the group of 3 wires are thicker. That group has black, red and green but no yellow. It doesn't look like they are identified on the board either. See picture. Can I make it work or should I just order a new one that looks like the one in the pictures ?

Thanks !

IMG_20200517_155309.jpg
0
nickr20215
nickr20215

Reply 4 months ago

Check the datasheet of your vesion it should have a wiring scheme

0
InstructaPudah
InstructaPudah

Question 2 years ago

Would it be possible to control the LTC3780 digitally, maybe with an Arduino and a DAC or digital potentiometer(s) with rotary encoder for voltage control instead of the pot?

0
Tricep Terry
Tricep Terry

Answer 4 months ago

i'm also investigating this, for now going for a kinda weird solution which is to mount the potentiometer near a servo motor and use gears to turn it, its gonna be ugly for sure, yet practical and simple.

1
Zemon_Compute
Zemon_Compute

Question 11 months ago

So with mine, I can adjust the Voltage fine but the current I cannot adjust at all. it only automatically draws Current. anyone know what could have caused that?

0
Swami7233
Swami7233

Answer 6 months ago

Did you able to adjust current after removing the small black wire?

0
SteveSi
SteveSi

Answer 11 months ago

The meter is wired up wrong. Do NOT connect the thin black wire going into the meter.

0
Zemon_Compute
Zemon_Compute

Reply 11 months ago

So i should disconnect this one from everything?

unknown.png
0
SteveSi
SteveSi

Reply 11 months ago

Yes

0
jayurban015
jayurban015

7 months ago

Greetings! Could you supply a link or a source for that terrific Project Box you used? I cannot find anything like that on eBay.

2
saisriram
saisriram

Question 9 months ago

Please upload the circuit diagram

0
CarlosC445
CarlosC445

11 months ago

Ótima iniciativa com grande criatividade trazendo uma opção de baixo custo e grande importância em projetos de educação tecnológica, essa adaptação de módulos prontos de power suply para montar uma fonte uma power suply de laboratório com custo reduzido ajuda em muito. Obrigado e um forte abraço. Prof Carlos Otávio Cardoso. NOTA 10!

0
MohammadA590
MohammadA590

Question 11 months ago

i want ask
about ampermeter screen,when i set amper ,are the info shown in screen, show my set or the exactily amper when i connect the load ?

1
slammertime
slammertime

Question 1 year ago

My DSN-VC288 (Dual Volt & Amperage meter) constantly shows zero amps. I have tried the "RESET" function already. Has anyone had a similar issue or could recommend some troubleshooting steps?

0
william.h.mic
william.h.mic

Answer 1 year ago

It looks like it detects current that is being used. If I use something (Other then an LED) it will show up when using it. I was sort of able to get around this, however I believe I connected the main display ground to incoming DC... Err, hot? Yea. So, kind of annoying, but if you run something that uses a few amps, it should work fine. ("Few amps" More then 20mA.)

0
SteveSi
SteveSi

Reply 11 months ago

The thin black wire from the meter should not be connected

0
SuleijmanC
SuleijmanC

4 years ago

i also busted 2 of them after soldering the potmeters it became faulty

dear scott i can adjust only from 0.8 volt to 2.38 volt then the red light fault lit up

can you explain this ????

0
Seanjeynes
Seanjeynes

Reply 4 years ago

Me to. All working until I desoldered the two pots. Soldered the new ones and now I get the red fault led. Any one got any tips to avoid this on the second one I just ordered? I'm using 500k and 200k linear pots. Is that OK?