audio panel/impedance mismatch question

[Peter R.]

dlevy > wrote:

> I went to Radio Shack and asked for a "audio transformer" 8/1000 ohm's. He,
> along with me, had no clue.
>
> Can someone please provide some more information on this black box item for
> me?

The problem with Radio Shack is that those guys worked at Burger King the
previous week.

http://tinyurl.com/g9qwu

There's the item and the part number. You need two of these and a project
box (or a small pill bottle).

Do you have the instructions on how to build this?

--
Peter

[Don Tuite]

On Thu, 22 Jun 2006 13:18:49 -0600, "dlevy" > wrote:

>The background music is too low on the intercom so I'm trying to build a
>cable to address the "impedance mismatch". This have been discussed and
>fixed many times over here but I'm special so please bear with me.
>
>I went to Radio Shack and asked for a "audio transformer" 8/1000 ohm's. He,
>along with me, had no clue.
>
>Can someone please provide some more information on this black box item for
>me?
>
>Thanks!
>
http://tinyurl.com/fbn5r

Don

[dlevy]

The background music is too low on the intercom so I'm trying to build a
cable to address the "impedance mismatch". This have been discussed and
fixed many times over here but I'm special so please bear with me.

I went to Radio Shack and asked for a "audio transformer" 8/1000 ohm's. He,
along with me, had no clue.

Can someone please provide some more information on this black box item for
me?

Thanks!

[john smith]

In article >,
"Peter R." > wrote:

> There's the item and the part number. You need two of these and a project
> box (or a small pill bottle).

One per audio channel?

[dlevy]

Thanks! No I don't have the instructions.


"Peter R." > wrote in message
...
> dlevy > wrote:
>
>> I went to Radio Shack and asked for a "audio transformer" 8/1000 ohm's.
>> He,
>> along with me, had no clue.
>>
>> Can someone please provide some more information on this black box item
>> for
>> me?
>
> The problem with Radio Shack is that those guys worked at Burger King the
> previous week.
>
> http://tinyurl.com/g9qwu
>
> There's the item and the part number. You need two of these and a project
> box (or a small pill bottle).
>
> Do you have the instructions on how to build this?
>
> --
> Peter

[Thomas Borchert]

Dlevy,

here you go, courtesy of Dave Katz way back:

If you have any
soldering skills, pick up a couple of 8/1000 ohm matching transformers
and a male/male mini-plug cable from Radio Shack. It's a minor
impedance mismatch problem. I put one together for my Cirrus and it
boosts volume by more than enough, and it's completely passive so
there's no batteries or other stuff. One of my fellow Cirrus brethren
came up with a great packaging hack--a small prescription pill bottle
is big enough to hold everything. Drill a hole in the bottom and in
the lid, tie knots for strain relief, and it's all quite tidy, if a
mite funny looking.

Yep, one for each side if you want stereo. The low impedance side
(red/white) goes to the audio device, and the high impedance side
(green/blue) goes to the Garmin. You can snip off the black center
tap on the high side. I hooked the white and green leads to the
common (sleeve) connections on each side, but I don't suppose that
it matters so long as you're consistent (so you don't phase-reverse
one side.)

They were the only transformers for sale at the Radio Shack at which I
got mine. They may just be called "audio transformers" or somesuch,
but
it'll say 8 ohm/1000 ohm on the packaging.


--
Thomas Borchert (EDDH)

[Thomas Borchert]

John,

> One per audio channel?
>

Yes.

--
Thomas Borchert (EDDH)

[dlevy]

Thanks Mr. Borchert!

"Thomas Borchert" > wrote in message
...
> Dlevy,
>
> here you go, courtesy of Dave Katz way back:
>
> If you have any
> soldering skills, pick up a couple of 8/1000 ohm matching transformers
> and a male/male mini-plug cable from Radio Shack. It's a minor
> impedance mismatch problem. I put one together for my Cirrus and it
> boosts volume by more than enough, and it's completely passive so
> there's no batteries or other stuff. One of my fellow Cirrus brethren
> came up with a great packaging hack--a small prescription pill bottle
> is big enough to hold everything. Drill a hole in the bottom and in
> the lid, tie knots for strain relief, and it's all quite tidy, if a
> mite funny looking.
>
> Yep, one for each side if you want stereo. The low impedance side
> (red/white) goes to the audio device, and the high impedance side
> (green/blue) goes to the Garmin. You can snip off the black center
> tap on the high side. I hooked the white and green leads to the
> common (sleeve) connections on each side, but I don't suppose that
> it matters so long as you're consistent (so you don't phase-reverse
> one side.)
>
> They were the only transformers for sale at the Radio Shack at which I
> got mine. They may just be called "audio transformers" or somesuch,
> but
> it'll say 8 ohm/1000 ohm on the packaging.
>
>
> --
> Thomas Borchert (EDDH)
>

[Thomas Borchert]

Dlevy,

> Thanks Mr. Borchert!
>

You're welcome. My work was only the collecting and keeping...

--
Thomas Borchert (EDDH)

[Peter R.]

dlevy > wrote:

> Thanks Mr. Borchert!

I just built this cable two weeks ago and I can attest to the accuracy of
the instructions that Tom posted and the improved results with interfacing
an audio device with the panel. You will not be disappointed.

--
Peter