<div><div dir="auto">Speaking of isolated sockets, has anyone come across an isolated 9mm H stereo socket (same height as QP / Thonkiconn)?</div></div><div dir="auto"><br></div><div dir="auto">Regards,</div><div dir="auto">JPS</div><div><br><div class="gmail_quote"><div dir="ltr">On Tue, 24 Jul 2018 at 4:49 pm, Andre Majorel <<a href="mailto:aym-htnys@teaser.fr">aym-htnys@teaser.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 2018-07-23 14:21 -0700, Tim Ressel wrote:<br>
<br>
> I've got another challenge: how to detect when a plug is<br>
> inserted into a jack. These are 3.5mm mono jacks btw. The<br>
> current method is to use a stereo jack. When a mono plug is<br>
> inserted the ring connection gets shorted to ground by the<br>
> sleeve of the plug. This method works well, but the stereo<br>
> jacks are taller than the mono jacks.<br>
> <br>
> The only jack I can use is a switched mono jack where switched<br>
> port is tied to the tip port until a plug is inserted. My idea<br>
> is to use the switch port to feed an out of range voltage to<br>
> the tip port, probably a negative voltage. Then use a<br>
> comparator to detect when the tip port goes high.<br>
<br>
Just in case you don't already know, there are phone jacks with<br>
isolated switch circuits. Switchcraft 113EX and 113X, for<br>
example :<br>
<br>
<a href="http://switchcraft.com/Drawings/110x-m110x_series_cd.pdf" rel="noreferrer" target="_blank">http://switchcraft.com/Drawings/110x-m110x_series_cd.pdf</a><br>
<br>
I've seen 3.5 mm sockets with suspiciously high number of pins<br>
so something similar may exist in that size.<br>
<br>
-- <br>
André Majorel <a href="http://www.teaser.fr/~amajorel/" rel="noreferrer" target="_blank">http://www.teaser.fr/~amajorel/</a><br>
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</blockquote></div></div>