Re: How does the microphone jack know that a microphone is plugged in?
- From: "robb" <some@xxxxxxxxxxxx>
- Date: Tue, 19 Feb 2008 15:51:15 -0500
"Timur Tabi" <timur@xxxxxxxx> wrote in message
news:55928862-a590-40a8-b182-ae35eee43538@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have a 1/8th inch headphone/microphone jack, and my devicethinks
that my headset is always plugged in, even when it isn't. Ipresume
that there is a physical or electrical sensor either in thejack
itself or in the device. A google search revealed nothing.Can
someone explain to me how this works? I need to know whether
replacing the physical jack could fix it.
How does your device indicate the headset is connected ?
is there a LED or a lcd display indicator ?
anyways in the simplest method...
the headset jack is a set of contacts installed in series with
the output lines to some external output like speaker out.
inserting a headset plug into the headset jack simply moves the
contacts apart and the plug intercepts/redirects the output
signal to the headset.
Removing the plug allows the contacts to spring back into their
series connection and the signal is no longer intercepted and
will continue on to the external output.
if one of those contacts breaks or is blocked by some
scata/crud/gunk then the jack will not be able to reset itself
into a series connection and the signal stops at the headset
jack.
that is the mechanical method.
hth
robb
.
- References:
- How does the microphone jack know that a microphone is plugged in?
- From: Timur Tabi
- How does the microphone jack know that a microphone is plugged in?
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