Awesome store to get custom transformers from for dyi amps ect - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: November 18, 2019, 02:35:45 pm
content: I just have to share my experience with this AliExpress store, as there's been a bit of bad press lately (reff that processmeter thingy)..In short, I built myself a nice small amp, and needed a custom transformer, and oh my... I found a gem of a store..https://www.aliexpress.com/store/911703At just 46$ including shipping, they provided me with the above pictured masterpiece, it arrived 2 days after it was shipped via DHL express, it took 2! days from China to Northern Norway!The seller was superb to deal with. Also it was packaged nicely. The transformer weighed 2 kg, it's 230v to +24 0v +24v and +10v all AC ofc.I'm making myself a hybrid tube amp/preamp kit...If this is in the wrong section of the forum, I'm sorry about that, but I didn't really find anywhere that fit better.

author: ETITsynthesizer
author_rank: Contributor
timestamp: November 18, 2019, 03:34:41 pm
content: I like this. could you provide a link to the seller?

author: Unknown
author_rank: Unknown
timestamp: November 18, 2019, 03:39:39 pm
content: I did, it'shttps://www.aliexpress.com/store/911703the url for a custom tranny is :https://www.aliexpress.com/item/1010124020.html

author: dom0
author_rank: Super Contributor
timestamp: November 18, 2019, 04:01:09 pm
content: The second link does not exist any more ("Sorry, the page you requested can not be found:(").This seems to work:https://www.aliexpress.com/store/911703/search?origin=n&SortType=bestmatch_sort&SearchText=customHowever, all results seem to be "can not be found", perhaps Aliexpress is having some technical issues right now, since it doesn't make any sense that something is listed in search results, but doesn't exist.

author: edavid
author_rank: Super Contributor
timestamp: November 18, 2019, 04:05:26 pm
content: What was the total time to make your transformer?

author: Unknown
author_rank: Unknown
timestamp: November 18, 2019, 04:10:42 pm
content: It was ordered on Oct. 23, so that's 26 days, before it arrived at my door, but I did change the specs at some point.Overall, not too bad considering the price and quality of the thing.Not sure why that link doesn't work for you, it opens just fine on my end ?

author: andy3055
author_rank: Super Contributor
timestamp: November 18, 2019, 05:38:06 pm
content: Great find. I wonder if they will to small ferrite core transformers for test equipment in case someone needs those obsolete Tek stuff!

author: tooki
author_rank: Super Contributor
timestamp: November 19, 2019, 12:50:43 pm
content: Quote from: dom0 on November 18, 2019, 04:01:09 pmAll the links work for me as of right now, so I suspect it was a temporary technical problem.

author: voltsandjolts
author_rank: Unknown
timestamp: November 19, 2019, 01:17:20 pm
content: I don't see any isolation voltage ratings. Is your transformer labelled with such?Please be careful.

author: wraper
author_rank: Unknown
timestamp: November 19, 2019, 01:22:39 pm
content: Quote from: voltsandjolts on November 19, 2019, 01:17:20 pmIt's meaningless unless you test it yourself. They can write whatever they want. Also transformers normally don't have such rating on label.

author: dom0
author_rank: Super Contributor
timestamp: November 19, 2019, 06:00:18 pm
content: Quote from: wraper on November 19, 2019, 01:22:39 pmI've seen "2.5 kV OK" or similar stamps on many transformers (Block, Gerth, and some others), so I think at least some reputable manufacturers are testing each unit during production, similar to how reputable tool manufacturers will test the insulation of each insulated tool (I believe they just run them through a salt water bath connected to 5 kV or so and measure the loading).However you are right that the isolation voltage is usually not put on the label directly. Instead they put the appropriate symbols on there which indicate for what kind of use (class I, class II) the transformer is suitable.

author: Unknown
author_rank: Unknown
timestamp: November 19, 2019, 06:17:03 pm
content: Oh, fun, So I can electrocute myself ? That's cool

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 19, 2019, 06:28:29 pm
content: Quote from: SantaClaw on November 19, 2019, 06:17:03 pmIf you think so...

author: Unknown
author_rank: Unknown
timestamp: November 19, 2019, 06:35:53 pm
content: Quote from: SiliconWizard on November 19, 2019, 06:28:29 pmNo really, it's ok, I bought a 60 amp fuse for it, and I plan on hanging the wires onto the power pole outside my house

author: andy3055
author_rank: Super Contributor
timestamp: November 20, 2019, 01:52:23 am
content: If you have a HV transformer from an old microwave, you could easily rig something up to test the insulation resistance from the windings to the exposed metal parts.