Bench Top PSU with 2 outputs - Page 1
Forum section: electronics / testgear

author: MrSadman
author_rank: Contributor
timestamp: February 07, 2014, 09:17:39 am
content: What I need?2 isolated outputs, that can also be connected in series and parallel.Voltage: 15VCurrent: 1ASeparate controls for Current and VoltageEverything you would expect from a lab power supply: CV, CC, short circuit protection, overvoltage protection, can handle variable loads etc.I don't need USB, RS-232, GPIBA small form factor would be a bonus.Where can I buy from:The local used market is useless, to say the least. The best I could find is a not working-2So, currently looking at Farnell, ELFA and RS.My progress sofar:At first I was looking at a Tenma 72-8690, mostly because of the price point. After some research I figured out that these things are cheap for a reason. Dave has a video where he shows how a Korad supply acts when switching the output on under load, potentially damaging circuits. Also the unit fails. So I started looking at a higher price point.Currently on my list:TTi EL302RD, about 400€ - More power then i need, quite large. Should have decent performance.GW Instek GPS-2303, about 400€ - Same as the TTi really.Maybe, Agilent E3600 series, a bit more expensive but closer to my required power ratings and size. Should definitely be on par with my requirements. Then again, Agilent brand name is not something I need, not going after ISO TS in my home lab or anything : )Feel free to jump in and give me some ideas.

author: jpb
author_rank: Super Contributor
timestamp: February 07, 2014, 10:23:29 am
content: I bought my TTi power supply fromwww.test-measure.co.ukUnfortunately he now seems to have sold off all his supplies, but it may be worth contacting him to see if anything is available. (He sells brand-new but old models, i.e. ones that are not currently sold but are brand new stock.)It also might be worth contacting TTi directly to see if they have any ex-demo units, if they do such things for power-supplies, I bought a counter direct from them as an ex-demo unit and it was at a decent discount but as new with a one year warranty.

author: Fsck
author_rank: Super Contributor
timestamp: February 07, 2014, 04:20:01 pm
content: E3620 fits the spot. I got mine for ~200$CAD, HP branded and looks almost like aged+new.maybe ebay from a nearby country?they also stack well if you intend to get other e36**'s. I have mine on top of a 3615 and under a 3630.

author: MrSadman
author_rank: Contributor
timestamp: February 08, 2014, 08:16:12 pm
content: Well, I've added another idea to my list.http://ee.farnell.com/aim-tti-instruments/pl303/power-supply-bench-30v-3a/dp/1510521andhttp://ee.farnell.com/aim-tti-instruments/el303r/psu-30v-3a/dp/1670780stacked on top of each other.Would have a small footprint and I would have one supply with slightly more punch. Also, when working with students I would have two separate supplies. Of course this idea will only work, if both of the units are true isolated supplies, and can be stacked on top of each other. Only experience I have with TTi is with a really simple signal generator. I guess, I could ask about this solution from TTi directly.

author: HKJ
author_rank: Super Contributor
timestamp: February 08, 2014, 09:26:38 pm
content: Personally I like TTi supplies, I have two PL155-P that have been running 24/7 for the last two years, controlled from some computers.I do also have some larger TTi supplies.Just be aware of the size of them, the front plate might not be very large, but the supply needs a lot of depth.