[sdiy] OTA subs & schemos WAS CA3080s purchased - now available in small er lots

[James Patchell]

At 12:13 PM 5/19/2005 -0700, Tim Parkhurst wrote:
>So here are the questions I have about this whole 3080/OTA thing:
>
>1) What sort of adjustments or changes would you need to make to sub a 13600
>or 13700 into a 3080 circuit?
>
>2) The 13600 is closest to the 3080, and the 13700 is a little more like the
>3280... right?

         NO...the OTA section of the 13700/13600/NE5517 are the same...

         The CA3280 is different from all of those


>3) What adjustments or changes would you need to make to sub a 13700 into a
>3280 circuit?

         If the circuit used the features that are in the CA3280....you 
cannot make the sub..easily...the reverse is true as well.  I use both 
parts...each has unique characteristics that can be exploited to accomplish 
certain ends.


>4) Where are some schematics for transistor/IC based 'roll your own' OTAs?
>
>
>
>Tim (awaiting enlightenment) Servo
>
>"Imagination is more important than knowledge." - Albert Einstein
>
>****************************************************
>
> > -----Original Message-----
> > From: The Old Crow [mailto:oldcrow at oldcrows.net]
> > Sent: Wednesday, May 18, 2005 9:08 PM
> > To: Synth-DIY
> > Subject: RE: [sdiy] CA3080s purchased - now available in smaller lots
> >
> >
> >   I have about 300 CA3280s left from a purchase of 500 I made several
> > years ago.  I use them mainly to repair broken Prophet-5s.  It is also my
> > favorite OTA for DIY stuff.  Otherwise, I've gone back to transistors.
> > Much less anxiety over whether or not a chip I need is going away.
> >
> > Crow
> > /**/
> >
> > At 04:22 PM 5/18/2005 -0700, Tim Parkhurst wrote:
> > >You know, I'd love to see an inventory of what chips SDIY members have.
> >
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>
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         -Jim
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