Recommendations for Hobbyist Bench Power Supply - Page 1
Forum section: electronics / general

author: TurboSam
author_rank: Contributor
timestamp: February 16, 2018, 04:44:19 pm
content: I'm looking for a new or used power supply for hobbyist type work involving microcircuits.I don't think I need or want much above 15 volts or 1 Amp, but if that assumption is wrong, please weigh in.I've been looking on Amazon, but when I dig into the reviews the "inexpensive" (cheap?) ones turn out to be crap quality and/or unreliable.Any thoughts or suggestions will be much appreciated!

author: helius
author_rank: Super Contributor
timestamp: February 16, 2018, 05:45:17 pm
content: Look for used B&K, Lambda, Kepco, and HP power supplies. The models from Instek and Protek are also good quality, albeit far east in origin.

author: taydin
author_rank: Frequent Contributor
timestamp: February 16, 2018, 05:55:24 pm
content: Don't get a power supply that doesn't allow setting a current limit. Being able to limit the current is very important when bringing up a piece of hardware for the first time. It also is indispensible when doing repair on an existing piece of hardware. With current limiting, you can find out that there is a fundamental problem with the circuit without making the problem worse. Without currently limiting, you plug in the hardware and you either hear an explosion, see wires melting or see the magic smoke release.

author: nanofrog
author_rank: Super Contributor
timestamp: February 16, 2018, 06:39:19 pm
content: Another vote to make sure it's both CV and CC capable (constant voltage & constant current respectively).The above recommendations are the way to go (I'd add Tektronix's CPS250 to that list). Currently however, there's a number ofGW Instek GPC-3020PSUs around for decent prices (it's a triple output model and has CV & CC modes). The one linked is less than $100 shipped.FWIW, dual, triple, or quad output models tend to be a much better bargain IME than buying a lot of single output units.As per voltage, if you'll be working on op-amps, you'll want more than 15V. ~30 - 32V models are usually the norm manufacturers produce as they're quite versatile.Good luck.

author: plazma
author_rank: Frequent Contributor
timestamp: February 16, 2018, 06:49:36 pm
content: DPS5005 module and casehttps://imgur.com/a/EIwgB

author: TurboSam
author_rank: Contributor
timestamp: February 17, 2018, 12:12:16 am
content: Thanks to all of you for the replies to far...I REALLY appreciate the specific product suggestions and/or links.That way I can track down the product, read the specs, see what it has (and why someone likes it), and extrapolate to other similar products.The hunt is half the fun.

author: Mr. Scram
author_rank: Super Contributor
timestamp: February 17, 2018, 01:15:14 am
content: Quote from: nanofrog on February 16, 2018, 06:39:19 pmThat's a great price. I've been really surprised by the GW-Instek quality.

author: TurboSam
author_rank: Contributor
timestamp: February 17, 2018, 03:06:15 am
content: Quote from: nanofrog on February 16, 2018, 06:39:19 pmSo, reading between the lines, I guess you're saying the 9 and 12 volt wall warts I have been using are not the best way to go....?

author: Mr. Scram
author_rank: Super Contributor
timestamp: February 17, 2018, 03:28:26 am
content: Quote from: TurboSam on February 17, 2018, 03:06:15 amThey're great for finding faults in your circuit quickly or if you're a fan of smoke.

author: TurboSam
author_rank: Contributor
timestamp: February 17, 2018, 04:00:36 am
content: Yes, I've see the magic smoke once or twice...

author: Pitrsek
author_rank: Regular Contributor
timestamp: February 17, 2018, 09:36:26 am
content: Quote from: helius on February 16, 2018, 05:45:17 pmI would add TTI, Hameg and AMREL to the list

author: Shock
author_rank: Super Contributor
timestamp: February 17, 2018, 10:38:21 am
content: If you are looking for really cheap I'd get a DPS5005 type module as suggested and add your own power source.Having a fully featured controls with mA resolution is really handy for low voltage electronics as well for repetitive tasks like a power on and off button.Perhaps one of your projects from there could be to design your own.

author: nctnico
author_rank: Super Contributor
timestamp: February 17, 2018, 11:04:19 am
content: IMHO the GW Instek GPE-2323 is a good buy because it has accurate digital readouts. In my experience it is very handy to have a power supply with an accurate display because otherwise you need a multimeter to adjust the voltage precisely and/or measure the current. A lot of the older and cheaper power supplies come with needle or 3 digit displays which are nothing more than indicators.

author: nanofrog
author_rank: Super Contributor
timestamp: February 17, 2018, 02:48:02 pm
content: Quote from: TurboSam on February 17, 2018, 04:00:36 amAnswered your own question.Quote from: Flinstone on February 17, 2018, 08:17:31 amQuote from: Pitrsek on February 17, 2018, 09:36:26 amDecent brands, but other than Keithley, EU centric (OP is in the US). Checked Keithly, and they're too expensive (the ones that are more on the reasonable side are High Voltage models). And some of them don't even have displays.Itech may be OK, but Tenma is usually junk (Farnell owned trademark/brand, so manufacturers change frequently).But as the use market is decent here, you get a lot more value for money this way (good gear for a fraction of the MSRP).

author: Mr. Scram
author_rank: Super Contributor
timestamp: February 17, 2018, 06:56:19 pm
content: Quote from: nanofrog on February 17, 2018, 02:48:02 pmThe Tenma supplies Dave also sells seem to be quite decent. They're also sold as Korad and in some places as Velleman branded.

author: TurboSam
author_rank: Contributor
timestamp: February 17, 2018, 08:51:31 pm
content: Thanks all! Your input shorted my "paralysis by analysis" to a brief (for me) one day.I pulled the trigger on a $50 GW Instek GPC-3030DD on eBay with very reasonable shipping charges from what looks like a reputable seller of high tech stuff in Santa Clara, CA (so my guess is a lot of the items come out of the labs in Silicon Valley). It looked like a good deal based on the prices I was seeing for the products you all mentioned, but if not, please be gentle.I certainly saw the value attraction of multiple outputs (probably the same male gene that makes me thinks three cups of laundry soap must be better than one), but I have limited lab desk space and thought the smaller footprint would be a good first step.One step (and output) at a time.Thanks again

author: Shock
author_rank: Super Contributor
timestamp: February 18, 2018, 12:58:36 pm
content: Can't go wrong for $50. Test it's functionality including a load test, earth/ground continuity and check AC/DC from the positive and negative output socket to earth/ground. Check overshoot and ripple (even better with a scope) to ensure sensitive circuits are not damaged or at least it lives up to specs.