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nuckollsr(at)cox.net Guest
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Posted: Mon Oct 09, 2006 11:38 am Post subject: Small audio jack question |
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At 02:49 PM 10/9/2006 -0400, you wrote:
Quote: | I bought an Intercom that allows two music inputs (one for the kids, one
for the grownups). I bought small sockets from Radio Shack.
They expect the usual "tip-ring-sleeve" 3-contact arrangement. But looking
at the male jack on an electronic device I own, it has 4 contact surfaces
on the male pin.
So what's the forth one for and will I need it?
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Wondering if you have what's called a "closed circuit" jack
intended to disconnect a "primary" load (like built
in speaker) when the "secondary" load (like headphones)
is plugged in.
A schematic for such a jack is attached. It has a total of
5 connections right and left inputs, right and left outputs,
plus ground.
f6e8ad.jpg
Does this look like it matches your jack? What's the Radio Shack catalog
number for the part you have?
Bob . . .
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Bill Denton
Joined: 10 Jan 2006 Posts: 97 Location: Chicago, IL USA
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Posted: Mon Oct 09, 2006 12:19 pm Post subject: Small audio jack question |
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It's not terribly unusual to see a 4-conductor stereo jack/plug wired with
separate grounds for each channel, i.e.
L+
L-
R+
R-
If you need a source for these plugs/jacks, I'll look them up for you...
--
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