i need to find 24 vac isolation transformers. the max load i need is 0.5 A. ideally a 12 vac secondary but 24 vac will work.
if not, can i use an 110 v 1:1 transformer and run it with 24 V? but size is an issue, do they come in 12 vac?
thanks a lot ............. walter
Pick up a small 20va Toroidal transformer and use the 24v winding as the primary, or remove turns to suit.
Wind on a small overwind of about 24T for 12v.
Seal off the mains input connections.
Ebay 263275635325 e.g.
Max.
I like the idea of adding your own winding, but, 2 turns per volt sounds a bit optimistic.
For a small transformer I would expect 5 or 6 turns per volt, so you would need 60 or 70 turns to give 12v.
I like the idea of adding your own winding, but, 2 turns per volt sounds a bit optimistic.
For a small transformer I would expect 5 or 6 turns per volt, so you would need 60 or 70 turns to give 12v.
I have rewound and also added overwinds on many different transformers over the years, the EI type I found was up around the 5t/volt, but Toroidal I have found as low as 1.5t/v
For a small one it could be higher, I have one here I can test.
But it is usually simple with a toroid to put on a few temporary turns and measure to find exactly.
Max.
thanks,
hopefully i will need a few hundred, all 60 hz. any idea who sells miniature 20-30 VA transformers in Canada or US?
thanks again .......... walter
thanks,
hopefully i will need a few hundred, all 60 hz. any idea who sells miniature 20-30 VA transformers in Canada or US?
thanks again .......... walter
If you want it to be as small as possible you will need something made specially. It's not technically difficult, to make a transformer, but all the mass-produced ones have 120 / 230 V inputs, so any standard transformer will have a primary winding that you don't want, so it won't be as small as it could be.
How about using a transformer that already has two separate 24V secondary windings - and just use one of those as the primary & the other as teh secondary?
(And of course insulate the original primary terminals).
Mostly what I said in post 3, if you have two winding's already then that should work. AnTek offer
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Might be worth getting a quote also.
Max.