Weird Component "Quiz"- Does anyone recognize it ?  - Page 1
Forum section: electronics / general

author: Post_Apocalyptic_Inventor
author_rank: Contributor
timestamp: May 16, 2014, 07:57:01 pm
content: I have this weird component lying on my desk for a couple of month now (I attached a photo). I salvaged this thing many years ago from some device, which I don't remember. It looks like some kind of transformer. It has a ferrite core. That core has 4 legs, but the two windings each sit on only two legs and have only one common leg. the second winding has 3 additional taps. The diameter of the magnet wire of the two windings seems to be around the same. Does anyone know what this thing is good for? (And please don't tell me to google it, the part number doesn't deliver any useful results)

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 16, 2014, 07:58:23 pm
content: I've seen these in a laserprinter to create the high voltage for the drum charge.

author: Post_Apocalyptic_Inventor
author_rank: Contributor
timestamp: May 16, 2014, 08:19:33 pm
content: Hm. It could be from a laser printer indeed.It is possible that this is some kind of transformer that was used in a switching converter or inverter circuit. It is odd though that the transformer has 4 legs, while only 2 of them are used. I would like to know the idea behind that. It also doesn't look at all like the high voltage transformers used in inverters for cold cathode fluorescent lamps or anything else that is familiar to me.

author: kolbep
author_rank: Frequent Contributor
timestamp: May 16, 2014, 08:56:47 pm
content: Some sort of Flyback transformer?

author: N2IXK
author_rank: Frequent Contributor
timestamp: May 16, 2014, 09:02:56 pm
content: The "1-423-405-12" looked like a Sony p/n to me.Searching for it shows a listing as a "transformer, ferrite" used in a Sony GDM20xx CRT monitor.http://www.encompassparts.com/item/1531226/Sony/1-423-405-12/Transformer,ferite_%28Frt%29The service data for that monitor is available here:http://elektrotanya.com/sony_scc-g24g_n-1_gdm-20se1t.pdf/download.htmland a check through the parts list shows that the transformer is T401 in the focus circuit. A look at the schematic will give you pinout etc.

author: Post_Apocalyptic_Inventor
author_rank: Contributor
timestamp: May 16, 2014, 09:08:23 pm
content: Thank you for that ! I remember taking apart a huge Sony CRT monitor some years ago. It was a special CRT monitor for graphic designers. It was stuffed with a lot of stuff you don't find in normal monitors. That would be it.

author: David_AVD
author_rank: Super Contributor
timestamp: May 16, 2014, 09:10:13 pm
content: Sometimes it's a good idea to "bag and tag" the more odd-ball parts at the time.

author: retrolefty
author_rank: Super Contributor
timestamp: May 16, 2014, 10:21:39 pm
content: Quote from: Post_Apocalyptic_Inventor on May 16, 2014, 08:19:33 pmSimple, to give it more mechanical strength when soldered to the PCB.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 16, 2014, 11:39:45 pm
content: Yup, Sony used a lot of those. Saturable reactor. I think usually used after a self-excited oscillator, to "throttle" the AC current coming out of it and into the rectifier.Tim