Re: LM3900 - was :[sdiy] IN your mind, what is ....

[Roman]

IN my mind, the SSM2164 is da most versatile chip in the world!!!
all right, calm now...
Or maybe CA3080.
Here's why:
In polysynth I used 47 CA3080: for VCF, VC-EG, VC-mixer, and pot replacement. It can be used also for S&H
In modular I used SSM2164 for VCO, VC-EG, VCF, it can be used obviously for VCA, VC-delay, mixers etc.
So maybe not a chip, but OTA in general.
OTOH the most used analog IC is IMHO an opamp. Generic type. You can do almost everything with it adding some minor stuff (like matched pairs that can cost 50 times more than the opamp ;-) )
BTW, I've never used LM3900.

Roman

---- Wiadomość Oryginalna ----
Od: Tim Parkhurst <tparkhurst at siliconbandwidth.com>
Do: 'jhaible' <jhaible at debitel.net>, Grant Richter <grichter at asapnet.net>, Joel Kirchartz <joel_kirchartz at hotmail.com>, synth-diy at dropmix.xs4all.nl
Data: Thu, 29 Jan 2004 14:57:33 -0800
Temat: LM3900 - was :[sdiy] IN your mind, what is ....

>I've seen schematics for using the 3900 as a voltage controlled current
>source and/or sink (Forest Mimms book, I believe). Could this be the core of
>a voltage controlled EG? I'm thinking this is a VERY simple way to control
>the charging current for a cap, but am I oversimplifying things?
>
>Tim (oversimplified) Servo
>"Imagination is more important than knowledge." - Albert Einstein
>
>********************************************
>> -----Original Message-----
>> From: jhaible [mailto:jhaible at debitel.net]
>> Sent: Thursday, January 29, 2004 12:35 PM
>> To: Grant Richter; Joel Kirchartz; synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] IN your mind, what is ....
>> 
>> In Fredriksen's book "Intuitive IC Opamps"
>> he calls the LM3900 "the first Quad".
>> 
>> So maybe the main reason for its popularity was
>> that it simply was the first opamp that only took
>> 1/4 of a DIP 14 package?
>> 
>> (Fredriksen designed the 3900, and also these
>> other "classics", LM324 and LM339.)
>> 
>> JH.
>> 
>> 
>> 
>> -----Ursprüngliche Nachricht-----
>> Von: Grant Richter <grichter at asapnet.net>
>> An: Joel Kirchartz <joel_kirchartz at hotmail.com>;
>> <synth-diy at dropmix.xs4all.nl>
>> Gesendet: Donnerstag, 29. Januar 2004 21:13
>> Betreff: Re: [sdiy] IN your mind, what is ....
>> 
>> 
>> > The LM3900 current differencing amp.
>> >
>> > Probably more applications than a regular op-amp.
>> >
>> > Serge Tcherepnin built a large part of the Serge system from them.
>> >
>> > From: "Joel Kirchartz" <joel_kirchartz at hotmail.com>
>> > Date: Thu, 29 Jan 2004 14:49:31 -0500
>> > To: synth-diy at dropmix.xs4all.nl
>> > Subject: [sdiy] IN your mind, what is ....
>> >
>> >
>> > What is the most versatile chip (be specific) ?
>> > Why do you think so ?
>> >
>> > ~kirch
>> >
>> >
>> >
>> >
>> > Let the new MSN Premium Internet Software make the most of your
>high-speed
>> > experience. <http://g.msn.com/8HMAENUS/2743??PS=>
>> >
>> >
>> >
>
>
>
>
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