How does one transform the impedance of a signal from X to Y given a core from a switched psu (or other easy source). I can figure the wire turns ratio from:
Zp^2 Np^2 Z=Impedance N=Turns ---- = ---- Zs^2 Ns^2
Now how to rule-of-thumb calculate the primary winding turns and area?
What concerns me is overloading the logic chip output and/or line driver.