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secondary voltage

secondary voltage

secondary voltage

(OP)
I want to be able to provide 24vac to a circuit from a 208/220/230/240 input (either/or).  I cannot find a non-custom transformer that will accept all these inputs...I know I can get away using say the one spec'd for 240, but my 24v becomes 21v.  Conversely, a 208v rating will get me ~28v...I've based my theory on the p/s turns ratio using the voltage values then keeping that ratio constant and applying it to the lower/higher input voltage.  I would like to maintain a 24vac output with a tolerance of no more than 5% if possible.

The problem I guess, is the fact that this 24vac is fed into an already designed (nonmodifiable) pcb so I cannot alter the 2Xvac once it's generated.  Any suggestions?

RE: secondary voltage

(OP)
thanks Don! Not sure how I missed that one...

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