# Autotransformer Turn Ratio

Discussion in 'Power Electronics' started by airplane100000, Sep 7, 2016.

1. ### airplane100000 Thread Starter Member

Aug 2, 2016
68
3

What is the turn ratio of this component (1-2:2-3)?
Is it 8.7? - 1/76 = (1/n)^2

2. ### AlbertHall AAC Fanatic!

Jun 4, 2014
6,681
1,577
That will be a reasonably close approximation. Note that the inductances have a 10% tolerance.

3. ### Dodgydave AAC Fanatic!

Jun 22, 2012
7,606
1,261
The resistance ratios are 1:28 roughly....

4. ### airplane100000 Thread Starter Member

Aug 2, 2016
68
3
Yes...
So which is it?

5. ### AlbertHall AAC Fanatic!

Jun 4, 2014
6,681
1,577
I would expect the inductance ratios to be the better estimate. The resistances depend on the wire diameter used whereas the inductance doesn't.

6. ### Dodgydave AAC Fanatic!

Jun 22, 2012
7,606
1,261
Well i would input a low voltage ac into pins 2-3 and measure it on 1-2 to see the difference in ratios.

7. ### airplane100000 Thread Starter Member

Aug 2, 2016
68
3
Thanks...
You wanna buy it and send it to me?