[sdiy] CMOS for linear circuits.

[Scott Gravenhorst]

I will be quite interested in your CMOS VCF.  I already use a CMOS VCO, 
(René Schmitz).  There are several designs for CMOS VCFs on the web, what
exactly do you plan?

I also made a CMOS sine waveshaper.  (and I've already posted that I have
no idea how accurate it might be or not be, but it does work and it's
output looks like a sinewave on a scope, it also sounds like a sine to my
ears).

A very good site for CMOS stuff is:

http://www5b.biglobe.ne.jp/~houshu/synth/

This is Osamu Hoshuyama's site.

ryan williams <destrukto at cox.net> wrote:
>Harry,
>
>thanks for the advice!
>
>harrybissell wrote:
>> The theremin is a VERY special case.... any interaction bewteen the 
>> oscillators will lock them and prevent beating, which will kill the 
>> theremin dead !!!
>
>good point, I really should have thought of this. Based on that alone, I
>am going to keep these gates on seperate chips just to be sure. I really
>want this thing to work when I go to build the second one.
>
>> CMOS 'linear' operation is really a bad idea all in all. If you only
>> need ~one~ amplifier and you have a spare gate... maybe.
>
>Ok, but I really liked the idea of a CMOS theremin. I am going to build 
>it this way, and if it doesn't work then I guess I will learn more from 
>the experience. It sounds like putting those 1MHz oscillators on the 
>same board with CMOS VCOs might be a problem. I'm just going to keep 
>them away from each other on the board and try to a good layout.
>
>> I don't call most simple RC delays, schmitt trigger oscillators
>> etc... "linear" CMOS. I think those are legitimate uses. Its when you
>> use feedback that its really 'linear'.
>
>I suppose, I just wrote the title of the message, and then wrote about
>something different. I am building CMOS VCOs and VCFs as well, so there
>is some of the 'linear'.
>
>-ryan
>

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