Audio Transformer IT-172

[Patrick Dunford]

I have been given several of these audio transformers.

The type number IT-172 for a transformer is found on the Internet on
Toa's German website:

http://www.toa.de/de/PA/V-1034B.html

Is the IT-172 a Toa product or a product of another company? I need to
know the input/output impedances and wire connections.

--
=========================================================================
Patrick Dunford, Christchurch, NZ - http://pdunford.godzone.net.nz/

If we have been united with him like this in his death, we will
certainly also be united with him in his resurrection. For we know
that our old self was crucified with him so that the body of sin
might be done away with, that we should no longer be slaves to
sin...
-- Romans 6:5-6
http://www.StudyLight.org/desk/?query=Romans+6:5-6

[Scott Dorsey]

In article <MPG.1652369c2...@news.clear.net.nz>,

Patrick Dunford <a47...@yahoo.co.nz> wrote:
>I have been given several of these audio transformers.
>
>The type number IT-172 for a transformer is found on the Internet on
>Toa's German website:
>
>http://www.toa.de/de/PA/V-1034B.html
>
>Is the IT-172 a Toa product or a product of another company? I need to
>know the input/output impedances and wire connections.

You can use an ohmmeter to find the general pinout, that is you can figure
out which pins go to windings. You should be able to figure out center
taps the same way, so you have a general drawing. Then all you need to
do is find the ratio and the impedance of one side.

You can find the ratio by applying 1 KHz from a signal generator into it,
unloaded, and measure the input and output voltages with an RMS or average
reading meter (not a peak reading meter because the thing will be ringing
a bit unloaded).

You can find the impedance of one side by putting a 1KHz square wave in one
end, then looking at the other end with a scope and adjusting a bridging
resistance until you get a nice clean square wave out of it. When you do,
that resistance is the impedance of that side of the transformer. Knowing
the ratio, you can figure out the other winding impedance.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."