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 Forum index » DIY Hardware and Software » Developers' Corner
CV and POTMETER use
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Grumble



Joined: Nov 23, 2015
Posts: 21
Location: Netherlands

PostPosted: Thu Feb 11, 2016 7:49 am    Post subject: CV and POTMETER use Reply with quote  Mark this post and the followings unread

Maybe I'm kicking an open door, but this is how I use CV inputs in my synth to be.
When a connector is plugged in, the control voltage is attenuated by the potmeter and when no connector is plugged in, the potmeter is used as a control potmeter, ranging from 0 (min) to VCC (=max)
Frontpanel connectors are bought with AlieExpress


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JovianPyx



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PostPosted: Thu Feb 11, 2016 9:17 am    Post subject: Reply with quote  Mark this post and the followings unread

One problem you can encounter with this circuit is that since you're plugging an output of something into this jack, you can see that as you plug it in, you are applying raw Vcc to that output for at least an instant until the jack's switch opens. That may not be very "nice" to the driving output which might be damaged.
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Grumble



Joined: Nov 23, 2015
Posts: 21
Location: Netherlands

PostPosted: Thu Feb 11, 2016 9:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Good point!
Is it sufficient you think to place a resistor of about 1k in series with VCC?
The pot is 100k
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PHOBoS



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PostPosted: Thu Feb 11, 2016 9:29 am    Post subject: Reply with quote  Mark this post and the followings unread

yeah what scott said, 1K works fine.
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