[sdiy] Jack insertion detection

Tom Wiltshire tom at electricdruid.net
Tue Jul 24 01:58:37 CEST 2018

What sort of “detector” have you got available? Where does the input go to? Audio or CV? Or both?

Olivier’s uP-based solution makes sense if that’s where your input is going, but if not, it’s quite a different problem.


       Electric Druid
Synth & Stompbox DIY

> On 23 Jul 2018, at 22:21, Tim Ressel <timr at circuitabbey.com> wrote:
> Hello supremely helpful folks!
> 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.
> Any other thoughts?
> -- 
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
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