Good designs of Expo Converters? Was: [sdiy] Multiplexed Expo Converter?

[cheater cheater]

O, neat! Didn't know about that!
That's actually pretty damn cool.

But I think also for the benefit of VCF and other things a single
shared EC could be cool as well...


On Sun, Aug 2, 2009 at 11:49 AM, Pete
Swarbrick<Pete.Swarbrick at panavision.co.uk> wrote:
>>Do you guys think that this could be >beneficial for bigger modulars?
>>Just one EC driving multiple things...
>
> You mean like Moog 901/921a&b  VCO banks ??
>
> ----- Original Message -----
> From: synth-diy-bounces at dropmix.xs4all.nl <synth-diy-bounces at dropmix.xs4all.nl>
> To: synth-diy <synth-diy at dropmix.xs4all.nl>
> Sent: Sun Aug 02 09:25:06 2009
> Subject: Re: Good designs of Expo Converters? Was: [sdiy] Multiplexed Expo      Converter?
>
> Wow, that's a lot of stuff! Thanks loads, Jerry. It'll keep me
> occupied for a longer while.
>
> Do you guys think that this could be beneficial for bigger modulars?
> Just one EC driving multiple things...
>
> Does the EC need to be close to the oscillator it's driving?
>
> The other important question is: where do you get good oversampling
> filters that would do a good job of reconstructing the S&H'd signal?
>
> Cheers
> D.
>
> On Sat, Aug 1, 2009 at 8:53 PM, Jerry Gray-Eskue<jerryge at cableone.net> wrote:
>>
>> Here are some write ups on expo converters:
>>
>> http://www.mik-music.org/ExponentialConverter&bl=y#A_common_exponential_conv
>> erter
>>
>> http://home.comcast.net/~ijfritz/sy_cir7.htm
>>
>> http://home.comcast.net/~ijfritz/sy_cir9.htm
>>
>> PAiA has a little different take on temperature compensation:
>>
>> http://paia.com/ProdArticles/9700faq.htm
>>
>> A good place to see various implementations are VCO schematics.
>>
>> - Jerry
>>
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of cheater cheater
>> Sent: Saturday, August 01, 2009 11:38 AM
>> To: synth-diy
>> Subject: Good designs of Expo Converters? Was: [sdiy] Multiplexed Expo
>> Converter?
>>
>>
>> Scott,
>> thanks for your answer. I didn't know expo FM was inharmonic, I'll
>> need to check that stuff out, it sounds really neat actually -
>> inharmonicity is one thing you can use to make sounds much more
>> interesting. On another note, PM is sort of like FM but not - it's
>> very fun - check it out if you ever get a chance. Patch something
>> across an accumulator cap or something (it would be more involved than
>> that to get real Phase Modulation but might give you some form of
>> foretaste)
>>
>> Guys, what are some good designs of Expo Converters?
>>
>> Cheers
>> Damian
>>
>> On Fri, Jul 31, 2009 at 8:08 PM, Scott Nordlund<gsn10 at hotmail.com> wrote:
>>>
>>>> 1. FM
>>>> I thought 'linear' audio rate FM was supposed to be much better. What
>>>> can you guys tell me about expo vs linear fm? I have seen some VCOs
>>>> with 'linear fm in', I guess that just bypasses the EC?
>>>>
>>>> Or is 'linear' audio rate FM better for the specific reason that
>>>> removing the EC makes the system simpler and hence easier to make very
>>>> good?
>>>
>>> Exponential FM is inharmonic, so it's generally less musically useful.
>>>
>>>> 2. PM
>>>> Correct me if I'm wrong, but I think PM again doesn't need an EC, does
>>>> it? Even if it's DC modulation...
>>>
>>> Analog phase modulation is used sometimes for radio signals, but I don't
>> if or how it could be implemented for musical purposes (I can't think of any
>> examples, phase shifters aside).
>>>
>>>> 3. AM/RM
>>>> I don't think AM needs EC.. at all... correct me if I'm wrong, please.
>>>
>>> You could run the two input signals through exponential converters, sum
>> them, then run that through a logarithm...
>>>
>>>
>>>
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