DIY Bench Power Suply - Page 1
Forum section: electronics / projects

author: João Matos
author_rank: Newbie
timestamp: July 30, 2016, 05:03:15 am
content: Hii guy's,I'm almost 17 years old, and my dad is an eletronic engineer and i'm always like eletronic's.So i decide to start working on it...This is my very first Project that i'm building for my own Lab.I was wondering what you guys think abaut this front paneli'm still working on eletronic part...

author: João Matos
author_rank: Newbie
timestamp: July 30, 2016, 05:05:40 am
content: By the ways JMC means my (dreeam ) Company "João Matos Corporation"

author: MarkF
author_rank: Super Contributor
timestamp: July 30, 2016, 05:13:35 am
content: Make sure your output banana jacks are 3/4" apart so the standard adapters like banana to BNC will plug into them. You want the (+) and (-) floating terminals next to each other.

author: João Matos
author_rank: Newbie
timestamp: July 30, 2016, 05:19:28 am
content: I' hadn't remeber thatThank You

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2016, 05:35:00 am
content: Keep us posted as your PSU develops.IMO ditch the coarse and fine voltage controls and go for a single 10 turn pot.

author: george.b
author_rank: Frequent Contributor
timestamp: July 30, 2016, 05:29:51 pm
content: Quote from: tautech on July 30, 2016, 05:35:00 amI agree. Way better than having coarse and fine adjustments, IMO.

author: bazsa56
author_rank: Contributor
timestamp: July 30, 2016, 05:44:07 pm
content: Quote from: george.b on July 30, 2016, 05:29:51 pm+1I have one psu with 10 turn pots and one with course/fine. I hate the latter, 10 turn pots are much better, easier to use, more precise.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: July 30, 2016, 05:47:12 pm
content: Don't buy those crappy 10 turn pots:http://www.ebay.com/itm/3590S-2-103L-10K-Ohm-Rotary-Wirewound-Precision-Potentiometer-Pot-10-Turn-/141936428392?hash=item210c120568:g:CK4AAOSws4JW8GYfhttp://www.ebay.com/itm/WXD3-13-2W-10K-ohm-Multi-Turn-Wirewound-Potentiometers-Pot-2-Pcs-/231253955834?hash=item35d7cf54fa:g:YDMAAOSwdzVXi89sThey are garbage, they simple break and stop working after no use, from experience.I can recommend you those:http://www.ebay.com/itm/1pcs-Bi-Technologies-10K-Wirewound-Potentiometer-7276R10KL-25-10-Multi-Turn-/151336206694?hash=item233c574166:g:vbkAAOSwo8hTqA6AI ordered them and they are really good, they feel almost exactly like "vishay spectrol" pots, you can barely notice a different in the feeling of moving the pot.- For some reason the pot I received didn't had a plastic shaft - but a metal one (while in the picture you can clearly see it has a plastic shaft), not sure why but who cares plastic or metal shaft.

author: João Matos
author_rank: Newbie
timestamp: July 30, 2016, 06:25:39 pm
content: I found this two on my dad's lab, they are both new.What do you guys think about it??

author: SeanB
author_rank: Super Contributor
timestamp: July 30, 2016, 07:09:31 pm
content: Genuine fakes, but usable as a short term measure. Just do not expect they will be consistent in operation, or that the wiper will always have good contact with the track.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: July 30, 2016, 07:22:46 pm
content: You are going to have a hard time cutting straight lines with just a utility knife, especially the USB slots, they will never be straight and clean cuts, unless you are going to use a CNC machine, that's a whole different story.

author: bitslice
author_rank: Frequent Contributor
timestamp: July 30, 2016, 07:27:43 pm
content: No switch for +/- 15vlabels underneath a terminal won't be seen when viewed on a benchI'm not sure which voltage is adjustable?hth

author: João Matos
author_rank: Newbie
timestamp: August 02, 2016, 04:27:29 am
content: Hi guy'sJust finished the USB POWER MODULE.See the notes that i put on Multisim schematichttps://drive.google.com/open?id=0ByAKxOA1U3lxdmU2Z2FaX1F1Yzg

author: bitslice
author_rank: Frequent Contributor
timestamp: August 02, 2016, 10:37:11 am
content: can't read that PDF for some reason

author: João Matos
author_rank: Newbie
timestamp: August 02, 2016, 11:00:46 am
content: I've resolved the problemMore files are avaliable now (Images)

author: Assafl
author_rank: Frequent Contributor
timestamp: August 02, 2016, 11:33:41 am
content: Quote from: SeanB on July 30, 2016, 07:09:31 pmIf that is the case you'd want to design the circuit so if the wiper (for any reason) does not have good contact the voltage will drop to 0V (rather than rise to full 15V and fries whatever DUT is connected).

author: donatas
author_rank: Newbie
timestamp: August 02, 2016, 12:03:05 pm
content: You should also reconsider the 3A sticker for USB if you are using 7805 for itUnless it's 3A sum current.