[sdiy] Jack insertion detection

Pete Hartman pete.hartman at gmail.com
Tue Jul 24 17:51:12 CEST 2018

This is what I was going to suggest.

These cliff jacks have a switch on sleeve as well as on tip.  If I take
that switch and run it to my "selector" with a pull up, I have zero when
there's no plug, and whatever the pull up value is when there is a plug.

This is the jack I'm using, a clone of the 1384:

My solution for the right-angle issue was to have a small side-board with
these jacks on them that has a right-angle header soldered to the main
panel PCB.  I suppose flying wires would do as well.


Yes, that's bodged a bit -- originally I was going to do stereo, but I had
the monos on hand and realized I could use the sleeve switch, and use a
cheaper jack.  That's what prototypes are for, right? :)

I didn't think the stereo thonkiconn was switched, which made it unsuitable
for my purposes.


On Tue, Jul 24, 2018 at 2:21 AM, Matthias Herrmann <
matthias.herrmann at fonik.de> wrote:

> The classic Cliff socket CL1384 as used on the older Doepfer modules has
> both
> contacts switched. It is not a right-angle mounted socket though. There
> are a
> lot of these other cheap alibaba sockets with both contatacts switched.
> The problem seems to be to find a right angle mounted socket?
> If you are looking for right angle sockets, the Thonkiconn is now
> available in
> stereo, too (PJ366ST). they have the same height as the mono thonkiconn
> (PJ398SM).
> Cheers,
> Matthias
> > 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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