[sdiy] 20ms delay? analog allpass filter?

[Ben Stuyts]

> On 9 Feb 2023, at 12:42, René Schmitz <synth at schmitzbits.de> wrote:
> 
> On 08.02.2023 22:39, David G Dixon wrote:
>> Fair enough, but it's fairly straightforward to achieve scanning crossfade
>> with analog.
> Yes, I thought you were asking why it's not switching.
> 
> I guess one can say that in the 1930s Hammond did a mechanical way, because that was doable.

That just reminded me that I have an old Schaller Rotor Sound which does something similar with a ton of inductors. See attached schematic.

Ben




> 
> While an electronic way wasn't practical. Maybe there are 4 or 8 way beam deflection tubes that crossfade?
> 
> 
> Best,
> 
>  René
> 
> 
>> -----Original Message-----
>> From: René Schmitz [mailto:synth at schmitzbits.de]
>> Sent: Wednesday, February 08, 2023 4:58 AM
>> To: David G Dixon;synth-diy at synth-diy.org
>> Subject: Re: [sdiy] 20ms delay? analog allpass filter?
>> 
>> [CAUTION: Non-UBC Email]
>> 
>> HI David,
>> 
>> On 08.02.2023 00:12, David G Dixon wrote:
>>> That's cool, but why not use a 4-bit counter and a 16-channel digital
>>> switch?
>>> 
>> Because that would be hard switching, while the scanner does a crossfade
>> 
>> (plus some high pass action) as the rotor plates move over the stator
>> plates.
>> 
>> The whole thing is a complex variable capacitor.
>> 
>> 
>> Best,
>> 
>>   René
>> 
>> 
>> --
>> synth at schmitzbits.de <mailto:synth at schmitzbits.de>
>> http://schmitzbits.de <http://schmitzbits.de/>
>> 
>> 
> 
> -- 
> --
> synth at schmitzbits.de <mailto:synth at schmitzbits.de>
> http://schmitzbits.de <http://schmitzbits.de/>
> 
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