[sdiy] Jack insertion detection

[Tim Ressel]

These are for CVs, although the rate can go pretty high. Eventually 
finds its way to an ADC input on a proc.

--timster


On 7/23/2018 4:58 PM, Tom Wiltshire wrote:
> 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.
>
> Tom
>
> ==================
>         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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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com