Ken Restivo wrote:
On Tue, Dec 28, 2010 at 11:12:48AM +0000, linuxdsp wrote:
Ken Restivo wrote:
On Wed, Dec 22, 2010 at 07:49:26AM +0000, Folderol wrote:
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer@xxxxxxxxx> wrote:
Jensen has some really good application papers talking about audio
transformers. By induction, one might get an idea of why they cost so
much -- same reason why other "pro" stuff with a reputable name also
costs a lot.
<snip>
I think some people are totally missing the point. The O/P has already said he
doesn't want to spend a lot of money as the kit he's connecting to is only of
moderate quality.
I don't know if the links I suggested to Ken are any good (whether he's able to
buy from those people) but I asked 'someone who knows'(tm) about these things
and was told that the 'Oxford' transformers are more than adequate for the job.
Thanks!
Yes, I obtained a pair of cheap telephone isolating transformers from Radio Shack. And it works! Yay! US$8 total.
It is indeed specced for 300-5000Hz, but it seems pretty flat when run with a short (1 foot or so) wire. But, I'm noticing a lot of high-end rolloff with a 20-foot wire. Are there any components I could add to combat this?
This is why you need transformers that are properly designed for the use
you intend to put them to. It might seem like a cheaper option to buy
anything you can find that looks like it might work, but this is often a
false economy. It might be better to consider if the problem you want
to solve can be achieved without resorting to transformers of any kind.
I suspect that you will find the response (even into a foot or so of
wire) is very far from flat.
Well, fine, but, it's a moot point since I don't have any money. If "properly designed" == "expensive" (and it usually does), then it's a non-starter for me.
I am trying to make the best I can out of the cheapest components available. So far, so good. This will do just fine. I'll experiment with some damping resistors and see how that works. If not, good enough for now.
Thanks everyone for the advice.
-ken
You may be able to solve the original problem without resorting to
transformers at all, which might work out better, especially if funds
are limited. IIRC you wanted to isolate the ground? Are you trying to
fix an earth / hum loop or some other issue?
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