AvE ain't got nothin' on this guy... - Page 1
Forum section: electronics / general

author: strangersound
author_rank: Regular Contributor
timestamp: June 09, 2016, 07:47:55 am
content: So, I'm browsing some videos and manage to pull this doozy up. The porno music is only the most obvious thing wrong with this video. Not surprising, the ratings and comments are disabled. But, an amusing video that just gets weirder as it goes. Let me know what you think.

author: Delta
author_rank: Super Contributor
timestamp: June 09, 2016, 08:30:12 am
content: Wow. Well, he really did make a transformer, so hats off for that...I did snigger when he was hitting his "shits" with a hammer...

author: Yansi
author_rank: Super Contributor
timestamp: June 09, 2016, 10:25:50 am
content: Apart from the crap insulating tape choice one should never use for that kind of job...I have wound and modified many transformers in the past, so what's wrong with doing so? But you should get the proper tools to get it done, at least the right materials for insulation. (I have "hamstered up" quite some of these materials)

author: EEVblog
author_rank: Unknown
timestamp: June 09, 2016, 10:54:21 am
content: Almost 100k subs!

author: nctnico
author_rank: Super Contributor
timestamp: June 09, 2016, 11:13:27 am
content: BooooringI wound my first transformer (24V AC 1:1) when I was 10 or so.

author: ataradov
author_rank: Super Contributor
timestamp: June 09, 2016, 04:47:38 pm
content: "In the old days" (c) it was normal to wind your own transformers, because you could not just buy the one you need. Typically it was limited to winding the secondary winding you need, since primary was fine if you start with a working transformer.

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 09, 2016, 07:36:53 pm
content: Quote from: ataradov on June 09, 2016, 04:47:38 pmWe had "kits" in several different wattages where the primary was already wound and you had to do the secondary yourself. Do these still exist or am I showing my age now?

author: Artlav
author_rank: Frequent Contributor
timestamp: June 09, 2016, 08:09:25 pm
content: Quote from: ataradov on June 09, 2016, 04:47:38 pmWhat was used as the core?I wouldn't mind winding my own instead of hauling an overpriced hunk of metal from the radio store, but the core material isn't exactly easy to come by.

author: ataradov
author_rank: Super Contributor
timestamp: June 09, 2016, 08:12:17 pm
content: Quote from: Artlav on June 09, 2016, 08:09:25 pmExisting transformers collected over the years.I don't think it makes any sense to do this today. It is cheaper and easier to buy professionally made transformers.And I don't really remember the last time I needed a big mains transformer, it is all switching supplies now.

author: SeanB
author_rank: Super Contributor
timestamp: June 09, 2016, 08:16:17 pm
content: RS used to sell them, and they were great for doing oddball transformers ( think if you needed a 10 secondary one with 5kV isolation between each secondary, you could fit it on the largest core though you lost a lot of rating to reinforced insulation) but they are no longer offered.They came as a kit, with a pre wound and tested encapsulated primary, a stack of core laminates in 2 taped packs and then a mounting kit and assembly frame, along with a printed assembly sheet on the turns ratios and wire ratings, along with assembly instructions on putting the cores together and how to clamp them.The cores are still available on ebay though, you just have to wind a primary as well on them, and remember that you will need to derate them a lot and wind on a lot more primary turns to not drive it as hard as they want you to, you are making a transformer that you want to last a while, not a room heater that is running just into saturation at the best of times.

author: AF6LJ
author_rank: Unknown
timestamp: June 09, 2016, 08:17:41 pm
content: That actually was a good video...I have done that before and when you can't get what you want, you have to roll your own.

author: chris_leyson
author_rank: Super Contributor
timestamp: June 09, 2016, 08:38:32 pm
content: Farnell and RS used to supply roll your own transformers with primaries already wound maybe they still do. But for newbies who don't understand flux density and core materials it's a bad amateur and dangerous video. Flux density, creapage and clearance, insulation don't really get much of a mention. WTF and this is safe with masking tape insulation. Chinese manufactures make more effort than this.

author: CJay
author_rank: Super Contributor
timestamp: June 09, 2016, 08:59:18 pm
content: Quote from: SeanB on June 09, 2016, 08:16:17 pmFunny enough I found four NOS RS transformer kits a few weeks ago. Should have snapped them up.

author: rsjsouza
author_rank: Super Contributor
timestamp: June 10, 2016, 03:46:11 am
content: Just like others, I've done this many times in the past with varying degrees of success. Nothing wrong with the video, TBH.