I thought I saw somewhere an article going in depth on wiring audio output transformers with associated math and layering of windings and such. Does anybody have any idea where that can be found? I've searched high and low....
Wndng toroids is really difficult! The most I’ll do is add a low voltage winding to a toroid power transformer, output transformers would require making bobbins to get the wire through the hole and more tedious than it’s worth.
You on about winding output transformers? I've re-wound quite a few mains toroids with good results. Winding a toroid by hand isn't that laborious or tedious, I like doing it, it's meditative. If you have more time than money, have a go, all a transformer is, is an iron core with loads of turns of copper wire. Yes, there is a bit more to it than that. It's easy to get bogged down in calculations, but if you chuck enough turns on the primary so you have high L, all there is next to sort is Z ratio.
Do a simple 5 to 3 pri sec layering, wing it, you may be pleasantly surprised or find it a waste of time, but you will learn from it and got experience, which is priceless.
I've a few video's on Youtube about hand winding toroids which may give you a few tips, Diabolical etc. Andy.
Do a simple 5 to 3 pri sec layering, wing it, you may be pleasantly surprised or find it a waste of time, but you will learn from it and got experience, which is priceless.
I've a few video's on Youtube about hand winding toroids which may give you a few tips, Diabolical etc. Andy.
Wing it? Nah, if you counted how many turns were on there in the first place you’d have a damn good idea how many you need to support your lowest frequency.
Hand winding with a shuttle isn’t hard at all, unless you try to make one very small or very large. The usual 200-800 VA cores are easy to work with.
The only thing hard to find is the non-adhesive tape. I wish I could find where Southwire gets it from, because the stuff they wrap the wires with in their Armorlite cable is exactly the right stuff (and when I get pieces several feet long you’re darn right I save it for transformers). Most of us give up and just use the yellow 3M stuff they secure windings with in SMPS ETD trafos. And just put it on one turn at a time.
Hand winding with a shuttle isn’t hard at all, unless you try to make one very small or very large. The usual 200-800 VA cores are easy to work with.
The only thing hard to find is the non-adhesive tape. I wish I could find where Southwire gets it from, because the stuff they wrap the wires with in their Armorlite cable is exactly the right stuff (and when I get pieces several feet long you’re darn right I save it for transformers). Most of us give up and just use the yellow 3M stuff they secure windings with in SMPS ETD trafos. And just put it on one turn at a time.
By "winging it" I meant don't worry if things aren't 100% correct, obviously you'll need to know how many turns you've put on, give or take the odd one or two. It's very easy to loose count.
Yep, non sticky PET or whatever is, is hard to get, glad to see you do the same as me, IE one turn of tape.
Andy.
Yep, non sticky PET or whatever is, is hard to get, glad to see you do the same as me, IE one turn of tape.
Andy.
As output transformers unsually require far more turns per volt than mains trannies, I'm afraid that using a shuttle is a very tedious job. Perhaps one might find an advice to DIY a proper toroid winding machine instead.
Last but not least: Toroid cores don't have gaps. Hence, only PP OPT's are feasible with this technology.
Best regards!
Last but not least: Toroid cores don't have gaps. Hence, only PP OPT's are feasible with this technology.
Best regards!
Kay Pirinha,
If I remember correctly, In the Deutsches Museum in Munich, I saw the Original [first] power mains transformer . . .
Guess what?
It is a Toroid!
I went to the museum in 2000 and 2002. What a wonderful experience!
(I was in Munich to get training from Rohde & Schwarz about their Test and Measurement equipment that I did sales and technical support for)
If I remember correctly, In the Deutsches Museum in Munich, I saw the Original [first] power mains transformer . . .
Guess what?
It is a Toroid!
I went to the museum in 2000 and 2002. What a wonderful experience!
(I was in Munich to get training from Rohde & Schwarz about their Test and Measurement equipment that I did sales and technical support for)
The Deutsches Museum at Munich indeed is a place of interest for any technical minded person!
If you visit the History section in Wikipedia, you'll find the confirmation that the first transformers were toroids ;-).
Best regards!
If you visit the History section in Wikipedia, you'll find the confirmation that the first transformers were toroids ;-).
Best regards!
Danke. Yeah, there's a lot of winding. I can make $300 to buy 2 transformers a lot easier ways and I'm not even a prostitute 🙂