300V DC supply - Page 1
Forum section: electronics / projects

author: LukeW
author_rank: Frequent Contributor
timestamp: October 27, 2018, 06:25:30 am
content: I’m looking for a power supply module with moderately high voltage.0-300V adjustable150mA outFlat DCI might be able to compromise a little on the current if I need to, definitely 100mA out at least.Connector doesn’t really matter. SHV or MHV or insulated banana jacks or whatever.Making one is kind of the last resort if I have to.Could anyone recommend where to buy something suitable?

author: ivaylo
author_rank: Frequent Contributor
timestamp: October 27, 2018, 06:50:09 am
content: ebay.This one just closed -https://www.ebay.com/itm/HP-Agilent-6186C-Power-Supply-300-V-AT-1-Amp/263890397669?epid=1904113194&hash=item3d7117e9e5:g:DZ0AAOSwqLxbez8aOr I don’t see them that often, but a couple of years ago I got a Matsusada RK-80H 0-320V 200mA PSU for a bit over $100 also on ebay.

author: jbb
author_rank: Super Contributor
timestamp: October 27, 2018, 06:55:23 am
content: HmmI'd be surprised if Magne-Power, Keysight (aka HP aka Agilent) or Tektronix can't sell you something.Also, sorry to be a worry wart, but be careful when using such a supply. They will spit out lethal voltages and can do so by surprise depending on the control settings. For example, some supplies will turn their outputs on when you turn on main power at the wall (depends on settings). This can beextremelysurprising when you just wanted to check the settings.

author: PointyOintment
author_rank: Frequent Contributor
timestamp: October 29, 2018, 07:33:31 am
content: Maybe either an old vacuum tube bench power supply like Heathkit used to (let you) make, or a used electrophoresis power supply. Electrophoresis power supplies usually are not isolated, with positive and negative outputs that are symmetric about earth ground, but without a terminal for ground, which makes them hard to work with. Also, their intended application isn't really sensitive to noise, so they might be noisy.

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 29, 2018, 08:07:27 am
content: Quote from: LukeW on October 27, 2018, 06:25:30 amLMETFY

author: coppercone2
author_rank: Super Contributor
timestamp: October 29, 2018, 09:25:02 pm
content: i have a sorensen that meets this spec pretty much

author: floobydust
author_rank: Super Contributor
timestamp: October 29, 2018, 09:55:57 pm
content: I used Xantrex HV DC power supplies XFR600-4 600V 4A, and see there is also XHR600-1.7 600V 1.7A.They discontinued the line, but some on eBay. B&K Precision 9185B also discontinued 0-400V 0.5A

author: digsys
author_rank: Unknown
timestamp: October 29, 2018, 10:06:58 pm
content: Quote from: LukeWIF you don't need any fancy DC / control etc you can use a variac > isolation transformer > full bridge > current limiting (as required)I've done this on a few occasions - 1A right up to 10A. You can even get DC controlled variacs and have a full feedback loop.It is actually a very efficient / simple trick - if suitable.

author: Gyro
author_rank: Super Contributor
timestamp: October 29, 2018, 10:38:01 pm
content: Quote from: PointyOintment on October 29, 2018, 07:33:31 amElectrophoresis power supplies tend to be sluggish in their regulation - under and overshooting very badly on step load. Not all of them are center grounded though, I have an Amersham Biosciences EPS 301 which has floating output, 5-300V, 0-400mA, 4mm sockets and without ground leakage detection. I still need to play around with the analogue filter time constants to see if I can get it to operate as a regular psu, hopefully response speed isn't bound up in the micro. There are a few of them kicking around on ebay but not as cheap as I got mine!Note: all of the others in the range have ground leakage and no-load sensing.https://www.eevblog.com/forum/chat/what-did-you-buy-today-post-your-latest-purchase!/msg1304744/#msg1304744Internal and catalogue:https://www.eevblog.com/forum/projects/gel-electrophoresis-power-supply-design/msg1459904/#msg1459904

author: coppercone2
author_rank: Super Contributor
timestamp: October 29, 2018, 10:39:00 pm
content: i heard those electrophorisis supplies are basically shit for electronics work

author: coppercone2
author_rank: Super Contributor
timestamp: October 29, 2018, 10:39:33 pm
content: Quote from: floobydust on October 29, 2018, 09:55:57 pmi think sorensen used to be them or vice versa

author: Wolfgang
author_rank: Super Contributor
timestamp: October 31, 2018, 10:31:47 pm
content: Quote from: LukeW on October 27, 2018, 06:25:30 amI did not find something smart either, so I homebrewed one, like here:electronicprojectsforfun.wordpress.com/power-supplies/high-voltage-lab-power-supplies/a-250v-150ma-variable-linear-power-supply/mine is 250V 150mA but if you find a proper transformer the design could be used for higher voltages.Maybe that helpsWolfgang