Need a toroidal mains 50VA 2x10v transformer for a project. Found a stock one some years ago, but can't now so may have to get one made. Any info on the best place?
2x9v does work, but the device works best at 20v. 2x12v is too much. And I need the centre tap.
I have used Antrim Transformers for small-volume (including 1 off) mains transformers for Hobby Audio projects in the past, and been happy with the results. These ranged from 70VA to around 700VA IIRC.
It looks like although Antrim transformers are still going, under the Trans-tronic umbrella:
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you might be better off with 'Canterbury Windings', which I think was the chap I actually used to talk to:
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You probably know this but you need to pay attention to loading etc. when specifying the actual voltage, especially for small VA xformers. Terry could advise you, I'm sure.
Not if you have the right machinery. In fact they are easier than normal transformers to assemble - putting Es and Is in (or Ts and Us) is not that simple
I've always found them much better at regulation and can be fitted in areas that hum would be a serious issue with a normal one. I have a quite presentableGoodmans stereo system but the idiots put in a normal transformer, rendering the tape players useless. Looking inside at the time it looked to me like there were mounting holes for a torroid, but no doubt the bean counters could not afford one! Brian
Yes back in the 60s I worked at a place that had one of those machines, but it could only do very small ones. I never did figure out how it did it though. Brian
We had one at a previous workplace. Wire is loaded onto a split bobbin which goes through the toroid. Then it is unloaded from the bobbin onto the toroid. There were also winders which used something like a bicycle chain linked though the toroid as a bobbin.
When I bagged a 110v IBM colour monitor 'Bargain' at a radio ham rally about three decades ago, a 60VA toroidal transformer with split primaries was the only viable solution to powering it from a 240v mains supply.
*So* viable in fact that I was able to mount it inside the monitor case to effect a self contained supply voltage conversion with no discernible
50Hz wobble.
My alternative open frame transformer solution otoh, located on the floor under the desk, was a "No Go" simply due to the effects of leakage flux even at this separation distance (nearly three feet!).
If you ever need a 'Testimonial' to the superiority of toroidal transformers over every other type in regard of compactness and low external field (particularly the practically *non-existant* external field), then I'm your man! :-)
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