[sdiy] OTA report

[Tim Parkhurst]

 Whoops! My bad. At least I got the URL right (okay, I used cut and paste).
I've got to admit that $4 is a very good price. That and a few extra
components and you've got a nice dual VCA. 

Tim (gold star for cut and paste) Servo
*****************

-----Original Message-----
From: James Patchell
To: Tim Parkhurst; synth-diy at dropmix.xs4all.nl
Sent: 4/7/05 6:44 PM
Subject: Re: [sdiy] OTA report

The Old Crow is not the one selling the CA3280's....that is me...and by
the 
way, I still have plenty of them.

At 11:31 AM 3/31/2005 -0800, Tim Parkhurst wrote:
>Hi All,
>
>Just wanted to report what I found from a recent Google search on OTAs
>
>Two interesting papers on theory and applications, both by
>Dr. William R. Grise
>
>Application of the Operational Transconductance Amplifier (OTA) to
>Voltage-controlled Amplifiers and Active Filters
>http://et.nmsu.edu/~etti/winter98/electronics/grise/wrg.html
>
>Operational Transconductance Amplifiers (OTA) for synthesis of
>voltage-controlled active-filter tuned oscillators
>http://et.nmsu.edu/~etti/fall98/electronics/grise/griseota.html
>
>*****************
>Mouser has the following:
>13600 (NJR brand)  16 DIP  .42 ea
>13600 (NJR brand)  16 DMP (surface mount) .53ea
>
>13700 (NJR brand)  16 DIP  .72 ea
>13700 (NJR brand)  16 DMP  .41 ea
>
>Digi-Key has:
>13700N  16 DIP  $1.43 ea
>13700D (NJR brand)  16 DIP  .99ea
>13700M (NJR brand)  16 DMP  .81 ea
>
>*****************
>The CA3280E is shown as ACTIVE at Intersil.com. Price is $3.03ea for
>quantities of 100 to 1000 (do I smell a group buy coming on?) Our own
Old
>Crow has them listed for sale at $4.00 ea,
>http://www.oldcrows.net/~patchell/parts/parts.html
>
>and Mouser has them at $5.23 ea (ouch).
>
>Search for 5517 at Mouser and Digi-Key turned up nothing. A Google
search
>was equally fruitless. Maybe I'm missing something basic here. Is this
OTA
>still available? Is it the same as the 13700 (just a different
munfacturer's
>number)? Anyway, I just wanted to share my findings with the group as
to the
>availability and health of the OTA. As you were.
>
>
>Tim (you can't spell tomato without ota...sort of) Servo
>
>"Imagination is more important than knowledge." - Albert Einstein
>
>
>--
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>
>
>
>
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         -Jim
***************************************************************
http://www.oldcrows.net/~patchell

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