Re: USB Headphones hack - Soldering a 3.5mm plug instead of the headphones

On Sep 17, 9:38 am, "Gareth Magennis" <sound.serv...@xxxxxxxxxxxxx>
wrote:
<benn...@xxxxxxxxxxx> wrote in message

news:1189983218.569810.312390@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx





So, to review the bidding:
1) you have a cable with a stereo 3.5m connector,
but only two wires in the cable.
2) You don't know which two parts (tip, ring, sleeve)
of the connector your two wires go to.
3) You connected your two unknown wires to L & R
and with the ground unconnected.

1) Yes,
2) The white wire from the cable is going to the tip, while the red
wire is going to the center. The plug itself has a sleeve portion
(ground), but there is no additional wire connected to it, only 2.
3) I soldered the white wire (tip) to the pcb where it says "L" and
the red to "R". The pcb shows a "G" but the stereo cable doesnt have
any other wire. Do audio stereo cables (with 3.5m plugs) normally have
3 conductor wires all the way through?

Your cable will have a ground connection, you probably inadvertantly chopped
it off while removing the outer sleeving. Go back and very carefully try to
remove the outer sleeving until you find a fine braid or otherwise that is
the earth connection. You may have to do this several times before the
ground connection reveals itself.

Gareth.- Hide quoted text -

- Show quoted text -

BTW, do you think I'll have any noise / impedance matching issues, if
I were to connect the headphones AND the 3.5mm cable? I figure it
might be nice to keep the originally earbuds soldered to the board in
additon to the stereo cable but not if I'll low volume / noise.

Thanks!

.

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