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8 ratios in one transformer alternatives
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gkmaia:
I am trying to build a project and one of the transformers output 8 different values. It will be pretty hard to buy something like that.

I am looking for idea and alternatives to manipulate the output of just one transformer and produce the attached output values.
mariush:
You can get a toroidal transformer with one secondary winding or two secondary windings and UNWIND them , then cut them to the lengths required.

For example, get an 115v/230v -> 115v AC unwind the secondary and cut at 10v or 20v steps ... if you have 200 meters of wire, you have 200m / 115v = ~1.75m per volt

Here's a starting point: https://www.digikey.com/short/p4338m
Psi:
Yep, unwinding and rewinding with extra taps is a pretty easy thing to do.
As long as you have access to the secondary winding without having to remove the primary.

I wouldn't bother cutting it into lengths, wind it in one length but with taps that come out and then go back in again.

Keep in mind that you will use some wire length in the taps.
So if you start with a 100V transformer and add new taps you will have lost some wire length and therefore lost some turns.
So the output wont be 100V any more.
Ya just need to add some extra wire or start with a higher voltage than you need.


I have a small toroidal transformer you could have, its 70mm diameter and 33mm high.
I dunno what the wattage is, you'd have to guess based on physical size
Input is 230V
However current output windings are all around ~15-30v.
So you would need to replace all of the secondary with new wire to get the 100V + taps that you need.

Zero999:
If you have a toroidal transformer, don't bother removing any windings, just wind extra ones on top, which can be connected in phase or anti-phase with the existing secondary, to get other voltages.
soldar:
You know I have wound many transformers back in my day but now I think I would rather find a pro shop who can make it to order in no time and better than I ever could.  They have the supplies and the expertise and can save you a lot of time and grief.
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