Build Your Own Variable Lab Bench Power Supply

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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:

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?...

Amazon.com:

1x LTC 3780: http://amzn.to/1DMl7G4

1x 12V 5A Power Supply: http://amzn.to/1DMlfp5

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

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

1x Voltage/Current Display: http://amzn.to/1c9uGK1

2x Binding post: http://amzn.to/1GRcw9X

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

1x 500kΩ Potentiometer: http://amzn.to/1E6t89w

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

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

16 People Made This Project!

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205 Discussions

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AntonioS113

1 year ago

Hi,

Please tell me, what happens if I connect the ”+” and ”-” output wires? Is there a fuse that burns out? Do I need to install a fuse, and where exactly do I connect the fuse holder and the fuse itself? And the power of the fuse?

Thank you

3 replies
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Bailey1233AntonioS113

Reply 7 weeks ago

Add the fuse from the + output wire make it a about a 5a if that's not enough go higher but if you go to hight it may not work efficiency

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saggylifenomoreAntonioS113

Reply 2 months ago

I'm a beginner but I guess there is a (tiny) fuse on the main board: 1:21 on the top right corner

0
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I-Nooton

2 months ago

Hello, I replaced 500K pot with 100K multiturn pot but the output cannot exceed more than 6.6V can someone explain why ? What should I do to make the PSU work normally ?

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JulenRodriguez

3 months ago on Step 4

Hi!
Can we find the electric/block diagram somewhere? I would like to do this project as my end of degree project.
Thank you.

1
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slammertime

Question 6 months 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?

1 answer
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william.h.micslammertime

Answer 3 months 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.)

1
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AnuragV

Question 10 months ago

I made this before and it was very well functional, later the fault led started glowing all the time and I wasn't able to use it because of no power at the output.

To fix this, I tried replacing the board but the new board seems to have some issue. None of the leds are glowing, output voltage is zero. I Verified that my power supply is functional and is providing 12 volts as expected.

Any suggestions for me or troubleshooting steps I can follow?

2 answers
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KudlasAnuragV

Answer 6 months ago

Unsolder undervoltage protection potentiometer and solder 500k resistor instead on 1st and 2nd pin (third remains blank).

0
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JohnM703AnuragV

Answer 6 months ago

Turn the undervoltage protection potentiometer anticlockwise.

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TrungT46oxikort

Reply 9 months ago

Hello, your project looks good. Can you tell me the maximum current of your power supply? I'm using a 12V 10A, I think it can be more powerful, please reply soon. Thank you <3

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oxikortTrungT46

Reply 9 months ago

Hello, in this project I used a 5A power supply, the maximum current of the regulator as far as I remember 10A. After this version, I modified it, added a fine tuning of current and voltage, added two functions, constant current (C.C.) and constant voltage (C.V).

Sorry, there's no way I can show you pictures because it's not where the power is located ...

1
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JonaFeurstein

Question 9 months ago on Introduction

What kind of case are you using? I can't find that one ore something similar.

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XJohnD

Question 1 year ago on Step 1

Mr. Great Scot,

I have a Signet HB-150 24T 24 volt charger that is from a Pronto M91 Sure Step power chair. I want to use the aforementioned charger to make a benchtop power supply. For more specification please refer to the attached picture.

My question is, can this automatic three stage battery charger be reasonably made into a good bench top power supply?

Sincerely Xtsrifx Xtsalx

P.S. I have the chair also and there are other parts that I am interested in dilly dallying with but I will talk to you about those items on another safari.

Signet HB 150 24T.jpg