[sdiy] Jack insertion detection

mark verbos markverbos at gmail.com
Tue Jul 24 10:11:45 CEST 2018

Be careful with the out of range voltage on the normal. A certain unnamed Euro company was doing this with a -12 directly from the rail. When a jack was inserted, this untamed -12 was sent to the output it was patched from until the normal was broken. This destroyed more than a few modules. All that it took to solve the problem was a resistor between.


> On Jul 23, 2018, at 11:21 PM, 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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