Cheap chinese adjustable DC-DC module, who has played with one? - Page 1
Forum section: electronics / beginners

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 24, 2016, 01:10:08 am
content: Hello!Has annyone of you played with one of these?http://de.aliexpress.com/item/Digital-DC-Converter-CC-CV-Power-Module-Led-Driver-Auto-Step-Up-Down-6A-Max/32623001964.html?spm=2114.47010708.4.10.2pTIOVIt is intendet to be used in an electrolysis tank were my current lab supply is allready dooing a fine job, now i would like a permanent solution to free my lab supply from this burden.The requirements towards load regulation, response time and so forth are not that important. But it should be somewhat short circuit proof and the output voltage should be "fairly stable" at +-0.2VGreetings,Peter

author: Wirehead
author_rank: Regular Contributor
timestamp: March 24, 2016, 11:48:27 am
content: I would rather pick something like this.http://de.aliexpress.com/item/CPS-3205-160W-110Vac-220Vac-0-32V-0-5A-Compact-Digital-Adjustable-DC-Power-Supply-CPS3205/32246063271.html?ws_ab_test=searchweb201556_2,searchweb201602_3_10036_10035_10034_507_10020_10001_10002_10017_10010_10005_10011_10006_10003_10021_10004_10022_10009_10008_10018_10019,searchweb201603_2&btsid=4ed47c2f-67c4-4764-85e3-4164d03c81a8Just plug it in the mains and off you go.. The other one still needs a transformer/smps..

author: Thilo78
author_rank: Regular Contributor
timestamp: March 24, 2016, 12:03:16 pm
content: Peter,You might want to check out Julian Illett's channel on YouTube.He has gone through quite a bunch of step-up and step-down modules, testing them for various applications.GreetingsThilo

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 24, 2016, 04:35:54 pm
content: Quote from: Wirehead on March 24, 2016, 11:48:27 amThanks, had not found that one. But i only looked for stuff that is available with shipping from inside europe.I need an additional SMPS annyway for the fans, stirr plate motor, logic and everything is ment to go in one box together

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 24, 2016, 04:37:52 pm
content: Quote from: Thilo78 on March 24, 2016, 12:03:16 pmHis videos on these things made me look them up in the first place, sadly he only had the smaller version of this one on his bench and ne never really measures the stuff, only shows its function.At least i never saw him hooking one up to a load and scope, still love his channel though.

author: station240
author_rank: Unknown
timestamp: March 25, 2016, 02:56:54 am
content: I've been playing around with a 30W 3A version of this sort of power supply. Voltage regulation was stable even with drastic changes in input voltage, 5V to 12V only +0.41% to output voltage (12V).I didn't find the 6A one you linked to, otherwise I would have gotten that instead.Mine little board claimed to have short circuit protection, two wiffs of smoke later, yeah no.Check to see if it actually has a current measuring resistor on the board, SMD ones have a R as the first letter.

author: station240
author_rank: Unknown
timestamp: March 25, 2016, 12:40:50 pm
content: My review of a 30W DC-DC module of this design.https://www.eevblog.com/forum/reviews/30w-sepic-dc-dc-converter-review-(5-35v-in-0-8-35v-out)/spoiler, the magic smoke did escape, but it wasn't my fault.

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 25, 2016, 02:55:20 pm
content: Quote from: station240 on March 25, 2016, 12:40:50 pmThanks, good read!Quote from: station240 on March 25, 2016, 02:56:54 amMhm. i might be completely on the wrong side here but... this claims to have a constant current source.Sould a constant current source not be short circuit proof by design?

author: botcrusher
author_rank: Regular Contributor
timestamp: March 25, 2016, 06:14:34 pm
content: I've had good luck with this cheap one on ebay, item number 181940997254Boost only, voltage range is correct. I haven't tried pushing it with regards to the current range, but since they tacked on wires even thicker than the ones on the image (14 AWG on mine) it seems about right.

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: March 25, 2016, 07:28:54 pm
content: I've played withhttp://www.ebay.co.uk/itm/LTC3780-Automatic-lifting-Pressure-Constant-Voltage-Step-Up-Down-Heatsink-New-/351397786563?hash=item51d0f0b3c3:g:o-AAAOSweW5VUbVgLTC3780 one seen in one of Julian's...