First off you will not get 70v ac on the connections you show as I think you intended the 18v to be in series with the 50v which it is not if you tap off where you show it going to the Gecko supply.
You would need to drop the brown to the green down to the blue.
What puzzles me is if you are bringing in 120v for the primary of the transformer, why not use that instead of the 100vac sec. for fans etc, do they really require 100vac?
If you need a 5v supply you could wind on about 10 turns of small gauge enamel and run it into a bridge and a LM7805 regulator.
Although what is wrong with the PC 5v supply?
With a toroid there is really no frame available as the core is generally covered so in this case it does not matter.
Nice size transformer though.
Al.
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |