[sdiy] Center Detent dead zone on an "attenuverter"?

Michael E Caloroso mec.forumreader at gmail.com
Sun Apr 3 05:33:42 CEST 2016

I saw a circuit somewhere with resistors across the deadband diodes.
I think it was a mod for the Minimoog VCO detune pots.  As the pot
wiper crossed into the deadband zone, the diodes stopped conducting
but the resistors conducted a smaller current which made fine tuning
around "0" easier.


On 4/2/16, rsdio at audiobanshee.com <rsdio at audiobanshee.com> wrote:
> On Apr 2, 2016, at 4:09 PM, Chris McDowell <declareupdate at gmail.com> wrote:
>> Thanks for the reply and input, Brian. A separate button to invert works
>> great, and I do that with some 20mm sliders for the same reasons you
>> listed. Thanks anyway! Just wondering if I'm overlooking something here
>> that would make this simple, and tiny, design work a bit better.
> Understood. Not only is simple a bit cheaper, but it can be faster to use.
> Looking at this another way, I think that if your -/+ pots controlled a VCA
> instead of directly controlling the gain of the pair of op-amps, then
> introducing a dead zone in the middle of the pot range would not truncate
> the CV signals going through the VCA.
> Of course, the problem with this idea is that a VCA per channel is way more
> expensive than a couple of op-amps per channel. There are also the DC bleed
> problems with VCAs. All things considered, I think you'd be able to affect
> your control taper a lot more easily with a VCA without distorting the
> signals passing through.
> Brian Willoughby
> Sound Consulting
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