SOLD (UK): assorted Tenma Power Supplies - Page 1
Forum section: electronics / general

author: TopLoser
author_rank: Unknown
timestamp: April 24, 2014, 06:50:13 pm
content: I've just become the unwilling owner of a selection of Tenma power supplies. Obviously I don't want to keep them so they're now for sale, hopefully priced to sell quickly - the last lot I posted on here were snapped up.They're all customer returns that have been repaired by Tenma, hopefully they upgraded the shoddy regulator boards on the new style ones. Tested by me as well, they all seem fine (apart from one, see below)2 x 0-32V 0-3Ahttp://uk.farnell.com/tenma/72-10500/power-supply-2ch-30v-3a-adjustable/dp/2251948?Ntt=72-10500Look like new. List £109+VAT, asking £45+VAT. 1 left.2 x 0-32V 0-3A, 1 x 5V 0-3Ahttp://uk.farnell.com/tenma/72-10505/power-supply-3ch-30v-3a-adjustable/dp/2251949?Ntt=72-10505Case slightly bent top right corner, bezel cracked bottom right corner. List £114+VAT, asking £60+VAT.1 x 0-32V 0-3Ahttp://uk.farnell.com/tenma/72-10480/power-supply-1ch-30v-3a-adjustable/dp/2251946?Ntt=72-10480Look like new. List £53+VAT, asking £30+VAT. 1 left.2 x 0-32V 0-5Ahttp://uk.farnell.com/tenma/72-8700/power-supply-2ch-32v-5a-adjustable/dp/1836058Look like new. List £172+VAT, asking £75+VAT. 1 left2 x 0-32V 0-5Ahttp://uk.farnell.com/tenma/72-8700/power-supply-2ch-32v-5a-adjustable/dp/1836058Looks like new, but channel 2 is faulty (voltage range is 5-37V not 0-32V). Channel 1 is fine. This should be easy fix, these supplies are linear, all discrete components and all through hole mounting, even the LM723 regulators are socketed. List £172+VAT, asking £40+VAT. 1 left2 x 0-32V 0-3A, 1 x 5V 0-2Ahttp://uk.farnell.com/tenma/72-8695/power-supply-3ch-32v-3a-adjustable/dp/1836057Look like new. List £140+VAT, asking £85+VATWill ship anywhere at cost, typically £10 UK, £20 EU, potentially stupid money elsewhere so please check.Obviously buyers outside the EU don't have to pay the VAT, neither do EU buyers with a valid registration number that actually belongs to them and not just somebody they know....ALL SUPPLIES ARE NOW SOLD

author: neslekkim
author_rank: Super Contributor
timestamp: April 24, 2014, 07:08:40 pm
content: Nobody have schematics for these?, just to find out if there are some supercap, battery, or something that is meant to remember the settings one program via the front?And, are some of these with USB connectivity? (Or, do you have parts from one with usb?)I bought one of the dual ones, looks like the ones on top, very good powersupply for my use, if some of those singles had been 5A version, I would be itching to buy another one, except that the shipping is maybe to much.Btw, Do anyone have idea of terminals I could use to replace the ones already there, to some that accept shrouded plugs?

author: mariush
author_rank: Super Contributor
timestamp: April 24, 2014, 07:33:17 pm
content: I've opened up and "mini-review"-ed the Tenma 72-8695 here:https://www.eevblog.com/forum/testgear/tenma-72-8695-2-x-32v-3a-5v-2a-mini-review-teardown/Should be very similar inside with the 72-8700 (which is just the 5A model).I'm low on money this month, otherwise the price for the 5A one is very tempting.

author: TopLoser
author_rank: Unknown
timestamp: April 24, 2014, 07:39:07 pm
content: No schematics from me, sorry.No USB ports on any of them.Regarding prices, I'll be dropping prices by £5 a week till they're all gone. I'm in no rush but be careful you don't miss out by waiting too long!

author: neslekkim
author_rank: Super Contributor
timestamp: April 24, 2014, 07:42:52 pm
content: Quote from: mariush on April 24, 2014, 07:33:17 pmI have the 72-10495, which I guess is kinda different:http://uk.farnell.com/tenma/72-10495/power-supply-2ch-30v-5a-adjustable/dp/2251947

author: Bored@Work
author_rank: Super Contributor
timestamp: April 24, 2014, 07:58:00 pm
content: Quote from: neslekkim on April 24, 2014, 07:42:52 pmThis and the similar looking ones are rebadged Korad PSUs. The single channel on was extensively discussed in several threads. However, I don't think anyone came up with a complete schematic.

author: neslekkim
author_rank: Super Contributor
timestamp: April 24, 2014, 08:07:44 pm
content: Quote from: Bored@Work on April 24, 2014, 07:58:00 pmYes, I have read some of them, someone made some schematic, I just hoped that since farnell is selling this, that it should exists some.But it also seems like the Korad's do come with USB?, but Tenma not?Is Korad the original name btw?

author: Bored@Work
author_rank: Super Contributor
timestamp: April 24, 2014, 08:17:17 pm
content: Quote from: neslekkim on April 24, 2014, 08:07:44 pmKorad is the original manufacturer. And they manufacture different versions, with and without USB. AFAIR the P version has USB, the D version doesn't.

author: TheBorg
author_rank: Frequent Contributor
timestamp: April 24, 2014, 11:54:29 pm
content: WHY IS INTERNATIONAL SHIPPING SO EXPENSIVE!?!

author: Monkeh
author_rank: Super Contributor
timestamp: April 25, 2014, 01:34:16 am
content: Quote from: TheBorg on April 24, 2014, 11:54:29 pmThere are plenty of supplies in this price range available in the US.

author: tjb1
author_rank: Regular Contributor
timestamp: April 25, 2014, 02:10:27 pm
content: Quote from: TheBorg on April 24, 2014, 11:54:29 pmI got the Korad 3005D from SRA-Solder when they had a refurbished one for $70, they sell new for $115 -http://sra-solder.com/product.php/6946/128/korad_ka3005d_dc_precision_variable_dc_power_supply

author: TopLoser
author_rank: Unknown
timestamp: April 27, 2014, 08:16:59 am
content: Quote from: TopLoser on April 24, 2014, 07:39:07 pmFirst round of price cuts, £5 off everything.

author: DeathTickle
author_rank: Newbie
timestamp: April 27, 2014, 02:26:56 pm
content: Hi, (my first post on the forum)I'm just starting to build myself a lab as I am tired of using my university lab to do all of my work. I am not looking to go really cheap with this, I would just like decent quality at a fair price. I was looking to buy the 2 x 0-32V 0-3A ones. Is this a good PSU to start out with or should I be looking for something else ?

author: jpb
author_rank: Super Contributor
timestamp: April 27, 2014, 03:12:41 pm
content: Quote from: DeathTickle on April 27, 2014, 02:26:56 pmThat range I think is good - I have a TTi 32V 2A which I find very useful. The Tenma are good value for money but they are probably not the same quality as a (much more expensive new) TTi supply let alone an Aligent one. What is missing (not considering build quality) is separate Voltage sense terminals and separate meters for both Voltage and Current which I find useful on my PL320QMD also I'm not sure if they allow options such as isolated/parallel/series/tracking. But even second hand you'd pay probably twice the price for a TTi supply (I paid £160 as new/old stock for mine) so it depends what you want.

author: wraper
author_rank: Unknown
timestamp: April 27, 2014, 03:23:46 pm
content: Quote from: DeathTickle on April 27, 2014, 02:26:56 pmGood enough to start with. When you will need something better IMO you will understand what you need and why.

author: TopLoser
author_rank: Unknown
timestamp: April 27, 2014, 06:38:19 pm
content: Quote from: TopLoser on April 27, 2014, 08:16:59 amQuite a few sold now, I've just reduced the price of the 3 double channel new models because nobody has bought any of those yet. There's also a faulty one I've added to the list at a reduced price.

author: SeanB
author_rank: Super Contributor
timestamp: April 27, 2014, 06:49:17 pm
content: Pity shipping is so expensive from UK to ZA, as like, as Ian has said, Holy Batshit Crazy!

author: tom66
author_rank: Super Contributor
timestamp: April 27, 2014, 07:02:02 pm
content: Damn if I had seen the faulty one before you had sent my two off, I might have added it... would be an interesting one to repair.

author: TopLoser
author_rank: Unknown
timestamp: April 27, 2014, 07:04:22 pm
content: Quote from: tom66 on April 27, 2014, 07:02:02 pmSwap it if you want? I'll refund the difference.

author: tom66
author_rank: Super Contributor
timestamp: April 27, 2014, 07:07:46 pm
content: Quote from: TopLoser on April 27, 2014, 07:04:22 pmI was actually thinking of getting all three, if it would fit.Repairing stuff is a hobby, I like to understand why things stop working (and hence try to prevent it in any future engineering I do.)

author: TopLoser
author_rank: Unknown
timestamp: May 07, 2014, 11:37:38 pm
content: Quote from: TopLoser on April 24, 2014, 07:39:07 pmTwo left, prices dropped again.

author: TVman
author_rank: Frequent Contributor
timestamp: May 09, 2014, 04:02:18 am
content: Is there anymore left?If so how much and how much to South Dakota ,USA?this one?2 x 0-32V 0-3ALook like new. List £109+VAT, asking £45+VAT. 1 left.Thanks!

author: TopLoser
author_rank: Unknown
timestamp: May 09, 2014, 01:40:15 pm
content: Quote from: TVman on May 09, 2014, 04:02:18 amShipping cost to the US is £46, more than the supply costs. They weight about 8Kg packed.But all supplies are now sold, thank you.

author: neslekkim
author_rank: Super Contributor
timestamp: May 09, 2014, 02:05:15 pm
content: and these are 220volts also, 110v in us?

author: TopLoser
author_rank: Unknown
timestamp: May 09, 2014, 02:18:04 pm
content: Quote from: neslekkim on May 09, 2014, 02:05:15 pmThey are indeed, you've got me thinking about where all the other ones went now!!

author: Monkeh
author_rank: Super Contributor
timestamp: May 09, 2014, 03:50:38 pm
content: Quote from: TopLoser on May 09, 2014, 02:18:04 pmMost of them should be switchable, surely?

author: TopLoser
author_rank: Unknown
timestamp: May 09, 2014, 04:12:00 pm
content: Quote from: Monkeh on May 09, 2014, 03:50:38 pmNope. Fixed voltage, the transformer has a single primary winding.

author: Monkeh
author_rank: Super Contributor
timestamp: May 09, 2014, 04:22:58 pm
content: Quote from: TopLoser on May 09, 2014, 04:12:00 pmYargh.