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Adding auxiliary inputs to stereos that don't have them

Forum Audio : Audio Technology - Adding auxiliary inputs to stereos that don't have them

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Archived from groups: rec.audio.tech (More info?)

Hi all,

I'm a big music fan, so we have radios all over the house.

We have an Emerson portable AM/FM/CD player in the dining room; we have
'The Curve' by Suncoast radio in the bathroom, along with a cheapo
shower radio in the shower; and various other ones around the house.

These do not have auxiliary inputs standard. I am in need of
information on where to tap into left, right and ground in order to
take advantage of the powered capability of the speakers in these
radios.

A few reasons for doing this:

a) I don't want to be beholden to headphones to listen to my mp3
player, not to mention carrying it around w/me about the house.

b) Those FM transmitters have little range and low power, plus the
stations they broadcast over are used in the D/FW, TX area.

c) I don't have money with which to buy better transmitters.

d) Why carry around powered speakers with me, when there are some in
every room?

e) I have a bunch of 1/8" audio jacks and plugs resting in a parts bin
awaiting use.

My goal is to make as few cosmetic changes as possible. Adding just a
switch for the extra input and a jack or plug to input the input to
would be ideal. I could figure that part out if someone can answer the
next paragraph...

On the inside, where would i find the usual place the signals go to in
order to reach the powered (amplified) speakers in the various units?

If anyone can give me specific components, chip numbers (and which
legs), etc. to look for, that'd be great. I't be better than poking
around in there with trial and error.

If you need more info, let me know...

--Electro--
aka The Other David

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Archived from groups: rec.audio.tech (More info?)

In <1125227518.513072.265850@g14g2000cwa.googlegroups.com>, on 08/28/05

at 04:11 AM, oicurmt@charter.net said:

[ ... ]
>These do not have auxiliary inputs standard. I am in need of
>information on where to tap into left, right and ground in order to
>take advantage of the powered capability of the speakers in these
>radios.

[ ... ]

Attack the units at the volume control. The wiper (center pin) goes to
the power amplifier. The pin that the wiper touches in it's most
counter clockwise position is ground. If you want the unit's volume
control to be active, attach to the third terminal of the control. You
may need to adjust the levels with a couple resistors.

If you want to retain the original function of the units, use switching
jacks.

A slightly more sophisticated approach (and for the small units, more
of a physical challenge) would be to add a resistor between the wiper
and the original circuit, add a resistor in series with your input jack
and "mix" the internal and external signals. The unit's own volume
control will deal with internal stuff and the plug-in unit must deal
with its own volume.

Don't use any AC adaptors while you are in the shower.

-----------------------------------------------------------
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wordgame:123(abc):<14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15
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Reply to Anonymous

Archived from groups: rec.audio.tech (More info?)

On 28 Aug 2005 04:11:58 -0700, oicurmt@charter.net wrote:

>I'm a big music fan, so we have radios all over the house.

I'm a big music fan. So I hate wall-to-wall music. I like silence,
or music listened to with proper concentration :-)

The advice in the post below is as good a general suggestion as you're
going to get.

Reply to Anonymous

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