Build your own Variable Lab Bench Power Supply

8 years later and unfortunately it has become just as cheap to buy one as it is to build one, even if you have a free power supply.

Maybe a new version soon with updated parts links?
I'd love to DIY a variable bench PSU to learn while building something useful.

Put a led on the out of the buck boost converter so you will get the 0 voltage

The potentiometers have a very limited range of motion and you don't have much control over the adjustments...
You will need multi turn potentiometers for that. What I want to learn how to do is to pre adjust the current before I connect something to it...

Instructions Unclear -
I think I may have accidentally Nuked someone. :/
😂❤

I can't even tell you how many times I have taken 110VAC, straight up electrocuted. One time I was replacing an old ladies 3 exterior lights. Her front porch, her side porch along her driveway and her back porch light. I got zapped on the first one. Usually, I can replace a light without turning off any breakers. As long as you are careful, not a problem. On the side porch I went ahead and turned off the breaker. I still received a shock. So on the back porch I flipped the breaker off and disconnected the power supply. I still got shocked for the third time. It was at this point that I came to the realization that the womans aluminum siding was shorted to ground. The entire exterior of her house was hot and ready to discharge to ground. That was why I kept getting shocked. Now, I am no slouch when it comes to electronics. I was an Avionics Electronics Technician in the Marine Corp. And I worked on the AV-8C Harrier jump jet. I even took 220VAC from my right hand straight to my arm pit. I was checking for 220Volts with my Simpson volt meter. My camo sleeves were rolled up and I had my arm pit resting on the coaxial cables for the ANALR-45 radar warning system, 5 cables with metal shielding on the exterior to vent any stray voltages directly to ground so as not to interfere with the radar systems. This was on the flight line at Marine Corp. Air Station Yuma, AZ. It was hot and sweaty, and just as I saw my voltmeter jump to 220Volts, my sweaty right hand slid right down the meter lead and made contact with my hand. I was locked in a death grip as my body tensed up. Luckily, I was able to overcome it in milliseconds, but not before receiving a very serious shock. Thank God the connection was from my hand straight to my armpit. Had I been grounded to any other part of my body, that current/amps would have travelled through my whole body, perhaps even stopping my heart. I still felt the shock all throughout my body, but that was just stray volts wandering through my body seeking ground. Luckily my armpit was making contact with at least 3 of those 5 coaxial cables, giving the electricity many options to return to ground rather than travel throughout my body seeking ground.

can this work to find some shorts circuits on a board?

is it just me or did he say "I'll wile up my old school pluck"?

Hi, I still have the EEV Blog diagrams though i really want build something much simpler with 4 channels at least
Often electronic projects are living well under 500 mA per channel
Thanks for sharing,
Regards
Jean-François

why can't I just make one out of a variac, a microwave oven transformer and a rectifier?

Great video. Can I use 24volt 2.2A ac to dc psu?

Sent your whatsapp No I want to buy this product from you

You need a power supply to build a power supply

How can i specify the power resistor?

Links are broken

Give whatsapp No & rate

Can I use a 250k ohm potentiometer instead of the 200k

Anything set up and step down at 100a?

Can we get a tutorial on the frankenstein resistor please? :D

A quick note - just tried this with two LTC 3780, and both gave faults out of the box. While trying to respect the "do not touch" the under-voltage protection pot in the end that needed turning clockwise a lot to get the fault light to go out and the OK LED to go on. Worth considering in case you see this too -- thanks for an excellent video!

Why is your voice so deep?

pretty cool build :)

is 12 max voltage ?

can someone tell me whats that background music called?

Hello, Trying to make the same project and I'm stumbling upon a problem. When I replaced the Vout potentiometer the reading goes from 0 to 25K Ohm only and the circuit is not working. Tried to measure the 500K potentiometer and when it's not connected to the board it reads fine, but once soldered with extension cables (10cm long) it goes from 2 to 25K only. The original and 2 other potentiomenters show similar values connected and all working fine by themselves not connected.

Ripple voltage?

What's the voltage output

Can i use 12V 20.8A - 240W. led strip Switching Mode Power Supply with all protection and charging high amp batteries make video pls

I used to watch these videos in college thinking when I earn I will make all this for myself. Now, I am back here earning and thinking to start this again. A great great thanks to GREAT SCOTT for all this content <3

I'd love to see an update to this where it's mains isolated.

Useful

Does the middle potentiometer even makes any changes mine doesn't make any difference when I rotate it

Can i use a toggle switch to short the output so i can adjust the amp ?

Hello, we have an agricultural land that has no electricity. Now, if we want to use a motorcycle battery, which is 12 volts, to get different currents, such as 10 or 12 amps, what transistor should we use?

Can we fix the buck boost module on a metal Cabinet with the cabinet acting as heatsink for the module ?

Is this power supply module available in dual rail type ?

Nice project, but I think instead of telling people to not try this project if they are inexperienced with electronics (because they have to wire a plug themselves) I would have told them to find another power supply that doesn't require you to wire your own plug. An old laptop power supply would have worked well for a lot of people.

Thanks, very helpful. Can we lengthen the wires by adding longer wires or will that effect the accuracty of the meter?

i heard that the digital multimeter you used has a voltage range of 0 to 30.(not sure or tested)

Just came across this, looks great. Where is a good place to get enclosures for projects like this?

how does it look on an oscilloscope on and off load ??

I know this board gives a minimum output voltage of 0.8v, how to reduce it to 0?

is this short circuit proof

Isn't under voltage protection important if you're powering this with a battery to prevent over discharging?

Anyone know where to find that case?

Another good video. Yes there were some things that could have been done better but other than not including a fuse... I look forward to the next video.

I don't see the case listed in the parts list. Where can I find one like it?