[sdiy] NPN pair VCF?

[tarcan]

-----Original Message-----
From: David G. Dixon [mailto:dixon at interchange.ubc.ca]
Sent: 23 Nisan 2009 Per?embe 06:11
To: 'tarcan'; 'Dan Snazelle'; 'sdiy'
Subject: RE: [sdiy] NPN pair VCF?


> The Pin 2(7)of CA3280 may also be used for source current when when pin
> 1,(8) not used.

I must confess I haven't explored the CA3280 yet.  I'm still having way too
much fun with the LM13700.

I see that pin 2(7) connects to the emitters of the diff amp trannies.  Are
you suggesting that this could be rigged up to an external "do-it-yourself"
Yes. For example using a lm3086 as a current mirror with four source current
output you can drive four CA3280OTA(two CA3280 Chip) at once.

current sink in such a way as to provide current-sinking gain control?  Or
are there some other clever uses for these pins?