[LAU] OT: isolating transformers, redux

[Folderol]

On Tue, 21 Dec 2010 11:48:57 -0800
Ken Restivo <ken at restivo.org> wrote:

> On Tue, Dec 21, 2010 at 08:04:29PM +0000, linuxdsp wrote:
> > Ken Restivo wrote:
> >> I've been looking around for a 1:1 line level transformer to lift the ground when connecting the headphone stereo output jack of a laptop or iPod to a consumer-grade amp that takes a headphone jack input.
> >>
> >> All I've been able to  find is insanely expensive, like US$200.
> >>
> >> http://www.jensen-transformers.com/prices.html#ci2rr
> >>
> >> That's ridiculous. I just need the transformer itself; I can connectorize it myself.
> >>
> >> But my searches (Jameco, Mouser, DigiKey) aren't turning up anything except POWER transformers, much larger than what I need.
> >>
> >> Can anyone point me to some part numbers and (reasonable) prices for a 1:1 line level transformer?
> >>
> >> Thanks.
> >>
> >> -ken
> >
> > I don't think that's insanely expensive :) given that jensen are  
> > probably one of the best at this sort of thing and their transformers  
> > are used in many professional grade applications - and if you are going  
> > to transformer-couple things then the quality of the transformer is  
> > absolutely critical (even to get consumer grade performance) and  
> > requires specialist knowledge and manufacture to get right (or a lot of  
> > luck!).  There may be other options that don't require a transformer -  
> > it depends upon the problem you are trying to solve.
> 
> The amp is a Cambridge Soundworks that cost US$100. I will not buy a transformer for it that costs more than the amp.
> 
> -ken

Then again there is ...
http://uk.farnell.com/oep-oxford-electrical-products/a262a7e/transformer-audio-1-1-1-1/dp/1689035

Which looks even better suited to what you want (and cheaper too).

Just cos they say PCB mounted doesn't stop you soldering wires directly on the
pins does it? :)

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.