Looking for schematic & PCB design of an adjustable Power supply [0-30V] [0A-5A] - Page 1
Forum section: electronics / projects

author: ZetaZuds
author_rank: Newbie
timestamp: August 04, 2018, 01:19:36 am
content: Hello Guys,I want to make an Adjustable Power supply [ 0v - 30v] [ 0A-5A] for my projects, therefore I'm looking for a schematic & PCB design of this project and if someone knows a useful link, please don't hesitate to share the infoThank youBest regards

author: JS
author_rank: Frequent Contributor
timestamp: August 04, 2018, 01:47:43 am
content: There are plenty of those out there, but well documented and tested is much harder... I do have a project on the list to do something, probably not 30V 5A but I'd like it to be scalable, when I get it I intend to leave it as well documented as I can but not for now I guess.If those are your only specs to meet you will probably find something, building it is quite as tricky as the design (schem and PCB) as thermals must be taken care for those levels. Once you include an extra spec, like X level of precission or time response, overshoot, etc. finding a project already solved is much harder.JS

author: Paul Price
author_rank: Super Contributor
timestamp: August 04, 2018, 01:50:52 am
content: What you are asking for is a 150-W max output power supply. With a linear power supply, this is a big object to behold, with a large transformer, large heatsinks and probably a fan to keep things from getting too hot.This P/S is not so hard to build if you can somehow cheaply find an available power transformer that could deliver 5Amps of current at >30V to have the necessary raw source of DC power to feed the pass transistors used for regulating without also having a non-loaded input voltage to the regulator IC's that wouldn't exceed the max. operating specs of most common reg ICs which typically top out around 32V.You would also probably need additional windings on the same transformer or require another transformer to provide bias voltages.What I would do in this situation is settle for lesser output current specs, or buy a cheap chinese pre-built supply from ebay with all the LED meters and case ready to go and then ruggedize it, hack it into a more rugged supply.There are a number of new < $60USD CV CC LED metered power supplies on ebay for you to start off with. If you tried to buy the parts to build something like these you could spend tens of hours and >$600 for parts alone to DIY. So buy a cheapie P/S just for having a cheap source for the cabinet, knobs, readouts and other parts you will need to attempt your own DIY device.There is anexponential increase in DIY cost,complexity, time to bulld and test, weight, and size going from a 1.2V-24V 1A output PS to having DIY'd a rugged, reliable 0-30V 0-5A supply.

author: ZetaZuds
author_rank: Newbie
timestamp: August 05, 2018, 05:42:23 pm
content: Thank you Guys

author: iMo
author_rank: Super Contributor
timestamp: August 05, 2018, 06:39:15 pm
content: There is a schematics and a pcb (in thispdf, may be an English version does exist as well). 1-30V/3A with LM723. Higher current to get is easy, 0-30V is more difficult, however.https://www.conrad.de/de/netzgeraet-bausatz-h-tronic-eingangsspannung-bereich-30-vac-max-ausgangsspannung-bereich-1-30-vdc-116661.html

author: Wolfgang
author_rank: Super Contributor
timestamp: August 06, 2018, 12:21:50 am
content: Hi,there are tons of suggestions on the web, so I have some more questions:- Minimum voltage- How precise should it be ?- Allowable ripple and noise ?- Short circuit protection method (foldback, limit, shutdown)Doing such a project for learning is always OK. Economy is another matter.I have built some PSUs, but for lab use I have a RIGOL DP832 (2*30V/3A,1x6V/3).You simple cannot make something even close for the price.