EEVBlog #258, Power supply #11 - Page 1
Forum section: electronics / general

author: Lightages
author_rank: Unknown
timestamp: March 14, 2012, 05:45:22 am
content: OK, not that the final details are out, which should have been announced from the start, I want to buy one. A portable power supply is just the thing that I could use, not another ho-hum bench unit. Why didn't you come clean with this earlier Dave?

author: amspire
author_rank: Super Contributor
timestamp: March 14, 2012, 05:58:31 am
content: Quote from: Lightages on March 14, 2012, 05:45:22 amDave gave the secret away two months ago. At least two of us noticed at the time.https://www.eevblog.com/forum/blog-specific/do-you-want-to-buy-the-powersupply-kit/msg81621/#msg81621Richard.

author: EEVblog
author_rank: Unknown
timestamp: March 14, 2012, 06:10:04 am
content: It wasn't supposed to be a secret, I just started out doing the videos and simply hadn't got around to mentioning the battery charging part yet. Many people started speculating about things, so it seems kinda fun to hold out for a whileDave.

author: EEVblog
author_rank: Unknown
timestamp: March 14, 2012, 06:26:39 am
content: Quote from: amspire on March 14, 2012, 05:58:31 amAnd it was also fairly obvious when I posted video of the early PSU board in late Jan. One of the connectors is labelled "BATT"Dave.

author: BravoV
author_rank: Super Contributor
timestamp: March 14, 2012, 06:30:45 am
content: Great idea, love it.Eagerly waiting to watch the next video on how you decide which switching chip that you're going to use as the pre-regulator, since there are so many choices of it out there, its the reasoning and consideration on the technical and economic/price aspects this really sparks my curiosity.You're killing us Dave, c'mon, upload the next one please !Dunno why, currently I'm imagining that someone in the future will definitely come up with a mod for this psu with an external wireless module using wifi or bluetooth module for controlling the psu remotely ! Talking about an extreme galvanic isolation from the psu.

author: EEVblog
author_rank: Unknown
timestamp: March 14, 2012, 06:42:19 am
content: Quote from: BravoV on March 14, 2012, 06:30:45 amUploading now.Although it's an hour long, I did manage to skip the actual selection of the DC-DC converter!There is some talk on what the chosen one suitable though.But I've done selection videos before, and it could take a 30min video to select just that one partDave.

author: george graves
author_rank: Super Contributor
timestamp: March 14, 2012, 10:29:07 am
content: Loved the video - but not a fan of the batteries. With that said, I think it's really interesting - and very cool to see the design changes, and I'm sure that it will fill a unique niche.I think the rev b is more what I was hoping for. Just my 2 cents.

author: EEVblog
author_rank: Unknown
timestamp: March 14, 2012, 12:51:19 pm
content: Quote from: george graves on March 14, 2012, 10:29:07 amYou can simply leave them out.Dave.

author: Lightages
author_rank: Unknown
timestamp: March 14, 2012, 02:15:14 pm
content: Quote from: amspire on March 14, 2012, 05:58:31 amQuote from: EEVblog on March 14, 2012, 06:26:39 amOK, I guess I missed these clues, but I don't follow every post in every thread! Until I was faced with the detail of it being battery powered in an obvious way it seemed like maybe just another power supply with some different control schemes. Now that it has an obvious difference and more utility I am more interested.

author: slateraptor
author_rank: Frequent Contributor
timestamp: March 14, 2012, 03:38:05 pm
content: Thanks for pointing out the RM series enclosures, Dave! Since they were listed in the "more enclosures" section, I completely over looked them while browsing Hammond's website for potential enclosure candidates. The RM2015S will serve perfectly for a project I'm working on.

author: Shale
author_rank: Contributor
timestamp: March 14, 2012, 06:51:14 pm
content: Have a design question Dave?you talked about putting the LCD on its on PCB but as I understood the video it was only going to be as big as the LCD. Are you planning on making the whole front panel a pcb like in your micro current design? If not then what is going to cover the rest of the front and why?

author: sacherjj
author_rank: Frequent Contributor
timestamp: March 14, 2012, 07:52:15 pm
content: Quote from: Shale on March 14, 2012, 06:51:14 pmI don't think he can make the front panel the LCD board, unless he changes the encoders and switches. It was going to plug in behind the switches.

author: Shale
author_rank: Contributor
timestamp: March 14, 2012, 08:16:55 pm
content: Quote from: sacherjj on March 14, 2012, 07:52:15 pmThat was the way I understood it, but he could make it where the switches are mounted on the front PCB, or choose a different switch, and let the encoder shafts poke through. I don't know. I am just curious why or why not that may be a good design idea.

author: EEVblog
author_rank: Unknown
timestamp: March 14, 2012, 11:04:47 pm
content: It will just be a normal front panel, either made from PCB or silkscreened panel.It would be too ugly to put the LCD actually on the front panel.Dave.

author: FJV
author_rank: Regular Contributor
timestamp: April 18, 2012, 07:00:17 pm
content: If you're going to make a portable power supply, why not put it in a multimeter enclosure?That would be connections at the bottom, potmeters in the middle and display at the top.This way if you would stand it on a support or use the flip out support (if possible or affordable), the wires would not be in front of the controls and while operating the controls, your hand would not be in front of the display.

author: FJV
author_rank: Regular Contributor
timestamp: April 18, 2012, 07:02:36 pm
content: For some reason it seems like 42 is the answer to every posting question.Makes one think of Hitchhikers Guide to the galaxy.

author: JimmyM
author_rank: Regular Contributor
timestamp: April 25, 2012, 04:36:17 am
content: It may not directly apply to the power supply, but between this and the constant current load project, I have learned a new appreciation and understanding for the op-amp in general.Thanks a LOT, Dave. You ROCK!

author: lk
author_rank: Regular Contributor
timestamp: May 03, 2012, 01:24:20 pm
content: Hi Dave,I really enjoy the uSupply series, and I'm looking forward to its availabilityBut in the mean time i was wondering about that heatsink you use in it, i have been though digikey, but have not been able to find it. Could you help out with at model name.Thanks in advance.-lk

author: Rerouter
author_rank: Super Contributor
timestamp: May 11, 2012, 12:03:24 pm
content: as has been said repeatedly in a few videos its only supplied by altronics (or some simlar aussie shopfront) so you wont find it online, though you may be able to find something similar