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8 ratios in one transformer alternatives
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NiHaoMike:
To cut down on the number of taps required, you can use Golomb spacing.
https://en.wikipedia.org/wiki/Golomb_ruler

Example: if you tap a winding so that it's 10V-10V-20V, the possible output voltages are 10V, 20V, 30V, and 40V, selectable using only 2 relays.
radix:
If you're getting a custom transformer wound, it would be better to use a balanced ternary type of ratios. So with 10 V and 30 V windings you could get output voltages of 0, 10 V, 20 V (30 V - 10 V), 30 V, 40 V (30 V + 10 V).
NiHaoMike:
The problem with windings in opposing phase is that the resistance still adds, increasing voltage drop over load.
Circlotron:

--- Quote from: NiHaoMike on May 16, 2019, 12:14:38 am ---To cut down on the number of taps required, you can use Golomb spacing.
https://en.wikipedia.org/wiki/Golomb_ruler

Example: if you tap a winding so that it's 10V-10V-20V, the possible output voltages are 10V, 20V, 30V, and 40V, selectable using only 2 relays.

--- End quote ---
Would be interesting to see what you could do with both Golomb spacing and reversing windings to subtract voltage.
wraper:
This circuit seems outdated by half a century at least. Most likely there are much better and cheaper modern ways how to do the same thing without using any exotic transformers.
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