- posted
16 years ago

I notice that many transformers are rated at some impedance

given some load.

For example:

Input Impedance = 10K

Output Impedance = 2K

Or,

Input Impedance = 600 Ohm

Output Impedance = 150 Ohm

It is obvious that there is some winding ratio involved,

and I'm used to seeing the winding ratio, and calculating

the winding to match a particular impedance:

X = a^2 * Y (Where a is the winding ratio).

If there is a ratio of 5:1, then the idea is to match

the impedances.

Say you have a 600 ohm source, and an 8 ohm load:

600 = (a)^2 * 8

Then a = sqrt(600 / 8)

a = 8.66

OK, fine.

Now, I'm looking for a transformer at "about" that winding ratio.

BUT! I am finding transformers rated at certain impedance to impedance.

QUESTION: Can I use the same algebra to essentially calculate the winding

ratio for that transformer?

(Meaning - they specify some ratio only because certain transformers are

designed specifically for applications - and other than power and current

ratings, if I can figure out the winding ratio, I might hone in on what I

want, right?)

Thanks!

Gary