I built a site for my vocoder project...

[danial stocks]

you can ditch HEAPS of stuff out of the envelope stage...
1... doesnt seem like you be needing the gate output....so  [going 
backwards] ditch the gate o/p amp, the trans, & 1 op amp before it.. can 
lose the input 741 as you are driving this from the op amp o/ps from the 
filter.., the env det is a full wave rectifier here.. if you at higher 
freq's you can get away with a half wave rect stage IMO, if you work oout 
the filter cap properly.. ie >200-300 hz you could prolly use 1/2 wave cct 
[saves an op amp..] 1/2 wave cct is not so good for low imp inputs, so the 
following stage is best be a unity gain follower, or you could kill 2 birds 
in 1 stone, use say 3k3 res to filter cap, this drives a 100K+ pot, then 
UGF.. so for the higher freq bands you could condense this to a 2 op amps.. 
on the lower bands you may want to use the full wave rect , so this would 
make it 3 op amps per unit.. in a 22 band sys this will save you at leat 88 
op amps! [22 quad pkgs! or 44 duals! lotta real estate] I also notice no dc 
offset cal in this system.. try for youself see if you need one, but I find 
a trimpot to trim out any little tiny dc offset in the op amps does increase 
performance at the low end a bit for ccts like these..
also I'd go for an OTA for VCA nice, quick, simple..
Cheers,
Dan
>Kevin Peek wrote:
>
> > Hello:
> >
> > I have built a site for my vocoder project.
> >
> > I have very little experience with circuit design or anything of that
> > nature.
> > I welcome any comments, corrections, criticisms, and otherwise.
> > I need feedback. These would be a major source of education for me.
> >
> > At least let me know if I am on the right track.
> >
> > http://pages.prodigy.net/kpeek1/VOCODERMAIN.html
> >
> > Sorry for the large images!
> >
> > Thanks.
> > Kevin
>
>--
>mark verbos
>
>"if you want something done right, build it yourself."
>
>verbos at mail.com
>
>watch out for...
>on my new label SIMPLE ANSWER "only a danger to myself"  and "Culture
>Shock" out now.
>also...
>"Impact 2000" on ReLoad, Belgium
>"Filthy Chicago" on 4x4, UK
>"American Outcast" on Armalyte, Sweden
>"Sequenced" produced with Thomas Heckmann on Wavescape, Germany
>I have moved to Berlin!
>
>

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