21 Dec
2010
21 Dec
'10
8:06 p.m.
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
21 Dec
21 Dec
8:32 p.m.
you mean :
a) 8mm stereo plug to a 1/4" stereo plug ?
b) 8mm stereo plug to a 1/4" mono plug ?
c) 8mm stereo plug to two 1/4" mono plugs ?
--
Leo
On Tue, Dec 21, 2010 at 11:05 AM, Ken Restivo <ken(a)restivo.org> 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
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
8:33 p.m.
On Tue, Dec 21, 2010 at 11:05 AM, Ken Restivo <ken(a)restivo.org> 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
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
$50 at Amazon
http://www.amazon.com/Cables-Go-41163-Isolation-Transformer/dp/tech-data/B0…
Know nothing about its quality
Google search was audio isolation transformers
- Mark
8:34 p.m.
On Tue, Dec 21, 2010 at 11:33 AM, Mark Knecht <markknecht(a)gmail.com> wrote:
Here's one for $11
http://www.amazon.com/Raptor-GL15-Ground-Loop-Isolator/dp/B0009O19LQ/ref=sr…
- Mark
On Tue, Dec 21, 2010 at 11:05 AM, Ken Restivo
<ken(a)restivo.org> wrote:
<SNIP>
Can anyone point me to some part numbers and (reasonable) prices for a 1:1 line level
transformer?
Thanks.
-ken
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
$50 at Amazon
http://www.amazon.com/Cables-Go-41163-Isolation-Transformer/dp/tech-data/B0…
Know nothing about its quality
Google search was audio isolation transformers
- Mark
8:37 p.m.
On Tue, Dec 21, 2010 at 11:34 AM, Mark Knecht <markknecht(a)gmail.com> wrote:
On Tue, Dec 21, 2010 at 11:33 AM, Mark Knecht
<markknecht(a)gmail.com> wrote:
Here's one for $11
http://www.amazon.com/Raptor-GL15-Ground-Loop-Isolator/dp/B0009O19LQ/ref=sr…
- Mark
And this Amazon vendor store sells it for $5.14
Is that cheap enough? ;-)
http://www.amazon.com/Raptor-GL15-Ground-Loop-Isolator/dp/B0009O19LQ/ref=sr…
On Tue, Dec 21, 2010 at 11:05 AM, Ken Restivo
<ken(a)restivo.org> wrote:
<SNIP>
Can anyone point me to some part numbers and (reasonable) prices for a 1:1 line level
transformer?
Thanks.
-ken
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
$50 at Amazon
http://www.amazon.com/Cables-Go-41163-Isolation-Transformer/dp/tech-data/B0…
Know nothing about its quality
Google search was audio isolation transformers
- Mark
8:33 p.m.
On Tue, 21 Dec 2010 11:05:57 -0800
Ken Restivo <ken(a)restivo.org> 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
This might do the job, but I don't know where you are in the world so have no
idea how you'd get them!
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduc…
--
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.
8:44 p.m.
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
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
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.
8:49 p.m.
On Tue, Dec 21, 2010 at 08:04:29PM +0000, linuxdsp wrote:
Ken Restivo wrote:
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
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.
9:01 p.m.
On Tue, 21 Dec 2010 11:48:57 -0800
Ken Restivo <ken(a)restivo.org> wrote:
On Tue, Dec 21, 2010 at 08:04:29PM +0000, linuxdsp
wrote:
Then again there is ...
http://uk.farnell.com/oep-oxford-electrical-products/a262a7e/transformer-au…
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.
Ken Restivo wrote:
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 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. 
9:06 p.m.
2010/12/21 Ken Restivo <ken(a)restivo.org>rg>:
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.
+1, I can buy a power AND an output transformer for a 100 watts tube
guitar amp head for that price and still have money left...
Do they also sell snake oil?
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
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
9:40 p.m.
On Tue, Dec 21, 2010 at 09:06:19PM +0100, Giuseppe Zompatori wrote:
+1, I can buy a power AND an output transformer for a
100 watts tube
guitar amp head for that price and still have money left...
Do they also sell snake oil?
An output transformer for a tube guitar amp is easy stuff compared
to a typical Jensen line or mic input transformer:
* It doesn't need to be high quality. The amp will actually
sound better if it distorts a bit.
* It can have some nice resonances in the audio band, that
will probably just enhance the sound.
* No need for magnetic screening.
* No need for electrostatic screening between primary and
secondary.
* No need for careful balancing and high CMRR.
* Can be bulky and heavy.
* etc.
$200 for a mic input transformer is really high end, but that
should be compared to the price of a quality microphone, which
could easily be ten times as much.
Ciao,
--
FA
There are three of them, and Alleline.
9:32 p.m.
On Tue, Dec 21, 2010 at 11:05:57AM -0800, 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
$200 is at the high end, and you probably don't need that one.
There are two names for quality audio transformers, Jensen and Sowter.
For the latter, have a look at <http://www.sowter.co.uk/acatalog/>
I've use Sowter products many times, never had any complaint.
Ciao,
--
FA
There are three of them, and Alleline.
22 Dec
22 Dec
7:10 a.m.
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.
http://www.jensen-transformers.com/an/Audio%20Transformers%20Chapter.pdf
Audio Transformers - Bill Whitlock Chapter 11 (3MB PDF)
From the "Handbook for Sound Engineers" Third
Edition.
http://www.jensen-transformers.com/an/generic%20seminar.pdf
Generic Student Seminar Handout (1.44MB PDF)
A generic version of the student handouts from Mr. Whitlock's seminars
http://www.jensen-transformers.com/an/an003.pdf
Interconnection of Balanced and Unbalanced Equipment
http://www.jensen-transformers.com/an/an004.pdf
Hum & Buzz in Unbalanced Interconnect Systems
-- Niels
http://nielsmayer.com
8:49 a.m.
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> 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.
--
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.
28 Dec
28 Dec
11:36 a.m.
On Wed, Dec 22, 2010 at 07:49:26AM +0000, Folderol wrote:
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> wrote:
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?
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
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.
11:51 a.m.
Ken Restivo wrote:
On Wed, Dec 22, 2010 at 07:49:26AM +0000, Folderol
wrote:
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.
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> wrote:
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? 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.
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(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
12:12 p.m.
On Tue, Dec 28, 2010 at 11:12:48AM +0000, linuxdsp wrote:
Ken Restivo wrote:
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
On Wed, Dec 22, 2010 at 07:49:26AM +0000,
Folderol wrote:
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.
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> wrote:
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? 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.
12:49 p.m.
Ken Restivo wrote:
On Tue, Dec 28, 2010 at 11:12:48AM +0000, linuxdsp
wrote:
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?
Ken Restivo wrote:
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
On Wed, Dec 22, 2010 at 07:49:26AM +0000,
Folderol wrote:
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.
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> 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?
10:35 p.m.
On Tue, Dec 28, 2010 at 12:10:39PM +0000, linuxdsp wrote:
Ken Restivo wrote:
Ah, thanks. The issue is ground hum, yes: hellacious, +10dB ground hum, louder than the
program material. It has to do with an automotive application. +12VDC to the laptop (or
+5VDC to iPod), +12VDC to the amp, and probably improper ground isolation within the
laptop or iPod.
I have had this problem before with laptops, but not as severe, and solved it by simply
lifting the ground pin on the AC adapter. There is no AC adapter here so that's not an
option.
But the transformer works well enough, so I'm happy.
-ken
On Tue, Dec 28, 2010 at 11:12:48AM +0000,
linuxdsp wrote:
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? Ken Restivo wrote:
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
On Wed, Dec 22, 2010 at 07:49:26AM +0000,
Folderol wrote:
> On Tue, 21 Dec 2010 22:10:07 -0800
> Niels Mayer <nielsmayer(a)gmail.com> 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.
11:56 a.m.
On Tue, 28 Dec 2010 02:35:47 -0800
Ken Restivo <ken(a)restivo.org> wrote:
On Wed, Dec 22, 2010 at 07:49:26AM +0000, Folderol
wrote:
Put the transformers on the end of the wire furthest from the laptop output.
You'll then get the full benefit of the laptop's low output impedance. Also, if
it is an actual headphone socket on the laptop that you are using, put 47ohm
resistors across the primaries of the transformers. This will dampen line
inductance and capacitance effects. Sometimes you can also improve the response
by putting resistors across the secondaries of the transformers - I know that
sounds counter-intuitive. You would have to play about with the values as it
depends very much on the transformer characteristics.
--
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.
On Tue, 21 Dec 2010 22:10:07 -0800
Niels Mayer <nielsmayer(a)gmail.com> wrote:
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?
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 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.
5132
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linux-audio-user@lists.linuxaudio.org
19 comments
8 participants
participants (8)
-
Folderol -
fons＠kokkinizita.net -
Giuseppe Zompatori -
Ken Restivo -
Leonardo Palomares -
linuxdsp -
Mark Knecht -
Niels Mayer