Found a design for a small lab power supply. Is it worth to build?  - Page 1
Forum section: electronics / beginners

author: koloko
author_rank: Newbie
timestamp: April 01, 2019, 07:33:17 pm
content: Here's the link:https://www.analog.com/en/technical-articles/high-performance-portable-dc-bench-power-supply.htmlThis seems like a power supply that I need for testing single components. Has anyone tried building it? Anyone got the pcb files? There doesn't seem to be one on the site even though it's a diy guide so I guess I'd have to make one. It also shouldn't cost more than 60 euros for the components.

author: Kleinstein
author_rank: Super Contributor
timestamp: April 01, 2019, 08:11:05 pm
content: The circuit has some limitations: Due to the 10 mOhms resistors at the output the voltage is not super stable under load.Another point is the heat dissipation effecting the regulators - at least the actual reference is external.The current limit is likely also not very stable due to the chip internal limit used - enough for a current limit and better than typical LM723 based ones, but not very accurate.Dave had some stability problems in a similar circuit - the first version of the µ-supply.The voltage regulators are made to work with reasonably well behaved loads - not everything a user might connect to a lab supply.So I would not call it high performance. It's more like a lower grade portable / low loss circuit. The typical cheap linear lab supply from China is more stable, though usually only good for 2/3 the specified current.

author: koloko
author_rank: Newbie
timestamp: April 01, 2019, 08:46:22 pm
content: What do you recommend then? I need a simple, low noise, stable linear power supply. I want something that I can just get the parts, order the pcb and assemble it. I've been looking at threads for diy supply but most of them are either unfinished, flawed, lm317 or I need to read 300 replies to figure out what works. I have crappy Chinese switch mode psu but it's basically noise generator.

author: jpb
author_rank: Super Contributor
timestamp: April 01, 2019, 09:07:31 pm
content: It depends if you want a project or want a power supply and how much of a rush you're in. Also on your budget.The DIY route is educational but by the time you have got the pcb, parts and a case you're probably spending a few tens of euros. A used supply on ebay might be a better option. It depends what is available in Spain, power supplies are heavy (at least linear ones are) so expensive to ship.

author: koloko
author_rank: Newbie
timestamp: April 01, 2019, 09:19:46 pm
content: Well I don't want to spend more than 60 euros. I'm not at that stage where I can follow through a lab power supply thread so I would like something thats finished, tested and working well. Once I'm more knowledgeable I'd like to get into power supply design but for now I just want to mess with different ics, amplifiers, filters, digital stuff etc. Basically building blocks. Also I don't want to buy one.

author: Cliff Matthews
author_rank: Unknown
timestamp: April 01, 2019, 09:41:49 pm
content: You couldcheck-out this thread(it's been popular for a while). There's lots of room for implementing improvements.*Aunque ya hecho, estan cobrando 44eu por uno aqui:https://www.amazon.es/KKmoon-Alimentación-Regulado-Laboratorio-Ajustable/dp/B01K1S30IO