Laboratory regulated power supply - Page 1
Forum section: electronics / projects

author: petr007
author_rank: Newbie
timestamp: June 13, 2018, 11:56:25 am
content: Hi, I want to build my own power supply with folowing specs.constant current, constant voltage modedc 0-30v 0-3ashortcircuit , overheat, overvoltage, overload, capacitive/ inductive load protection and IDIOT PROOFI want to use toroid transformer powered from mains (ac 220v to ac 24v)It should have 3.3v 5a, 5v 3a, 12v 3a, 24v 2a, symetric -12v+12v 2a sockets with fixed dc voltages and same protections as regulated part as written.I prefer construction without fan because it produces dust and noise etc.I dont know if I should have linear or switching components on regulated and fixed parts.I want to make pcb (in china) and 3d print enclosure or make it from aluminiumPlease try to suggest me some schematic, I have experiences with eagle so I can do board from schematic, but I cant invent schematic.Please help me. Thank you

author: Gibson486
author_rank: Frequent Contributor
timestamp: June 13, 2018, 12:06:49 pm
content: https://www.crowdsupply.com/envox/eez-h24005

author: petr007
author_rank: Newbie
timestamp: June 13, 2018, 12:24:04 pm
content: Thank you for the link. It looks good, but there is one thing: I want to make it by my self because I want to learn something while making it, not just buy it... Hope you understand.

author: Gibson486
author_rank: Frequent Contributor
timestamp: June 13, 2018, 12:36:23 pm
content: I understand you want to learn and I applaud you for it, but at some point, you need to make a sound judgement that what you want to learn is a rather daunting thing and really requires a lot of time investment. You want to learn the whole thing, but man, that is a lot. You would be better served to get something open source and work from there and really becoming familiar with parts that peak your interest.. You can learn just as much by looking at another design and tweaking it. Also, working with mains is dangerous if you have no idea what you are doing. I mean, you want to mains, then the regulation and protection aspect, then the PCB. At most companies, that would be three different EEs working on a team.

author: David Hess
author_rank: Super Contributor
timestamp: June 13, 2018, 01:25:41 pm
content: I suggest breaking it into separate smaller projects; a single bench power supply with that many outputs will be unwieldy both in size and complexity.

author: gbaddeley
author_rank: Regular Contributor
timestamp: June 14, 2018, 09:24:24 am
content: Try building a simple +2 to +30V and -2 to -30V linear regulated power supply based on LM317T & LM337T adjustable regulators. There are plenty of schematics to be found.

author: bd139
author_rank: Super Contributor
timestamp: June 14, 2018, 09:28:31 am
content: Read Art of Electronics chapter 9, conveniently the free chapter:https://artofelectronics.net/wp-content/uploads/2016/02/AoE3_chapter9.pdf... covers what, why, where, how, right up to thermal design.Then study designs for bench power supplies. Some of the best documented designs are from HP:http://reza.net/files/hp-6236B.pdfThen approach the problem with the tools you have learned

author: ledtester
author_rank: Super Contributor
timestamp: June 15, 2018, 03:26:00 pm
content: You might find this video (and the followup one) helpful: