[sdiy] Jack insertion detection

[John P Shea]

Speaking of isolated sockets, has anyone come across an isolated 9mm H
stereo socket (same height as QP / Thonkiconn)?

Regards,
JPS

On Tue, 24 Jul 2018 at 4:49 pm, Andre Majorel <aym-htnys at teaser.fr> wrote:

> On 2018-07-23 14:21 -0700, Tim Ressel wrote:
>
> > I've got another challenge: how to detect when a plug is
> > inserted into a jack. These are 3.5mm mono jacks btw. The
> > current method is to use a stereo jack. When a mono plug is
> > inserted the ring connection gets shorted to ground by the
> > sleeve of the plug. This method works well, but the stereo
> > jacks are taller than the mono jacks.
> >
> > The only jack I can use is a switched mono jack where switched
> > port is tied to the tip port until a plug is inserted. My idea
> > is to use the switch port to feed an out of range voltage to
> > the tip port, probably a negative voltage. Then use a
> > comparator to detect when the tip port goes high.
>
> Just in case you don't already know, there are phone jacks with
> isolated switch circuits. Switchcraft 113EX and 113X, for
> example :
>
>   http://switchcraft.com/Drawings/110x-m110x_series_cd.pdf
>
> I've seen 3.5 mm sockets with suspiciously high number of pins
> so something similar may exist in that size.
>
> --
> André Majorel http://www.teaser.fr/~amajorel/
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