Re: [LAU] OT: isolating transformers, redux

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@email-addr-hidden> 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.

> Since I have the magic of JAPA handy, perhaps I'll actually measure its frequency response. Nice to have great (free) tools available for this stuff.
>
> -ken
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-user
Received on Tue Dec 28 16:15:03 2010