New filter schematic

[Michael Lloyd]

Chris (and others who could answer):

I've seen some circuits using multiple "3080 type" OTAs that share a single
current limit resistor (R12 in your design), some that use individual
resistors per OTA and some that use no resistors at all! Is there anything
magical going on that affects the decision of how to do it? I've read that
the current control input was VERY unforgiving of mistakes and had a couple
of bad experiences with shorts, killing the device. So I usually use a
seperate resistor for each OTA current control input. Plus the extra
resistors help in the layout from time to time. I'd appreciate anybody elses
thoughts.

Michael

----- Original Message -----
From: <cmacdon at ix.netcom.com>
Subject: New filter schematic


> I've been working on a PCB layout for this and hope to have a prototype
> board manufactured sometime soon.  Thanks for everyone's help on this
> and I would welcome comments or suggestions on the new schematic.
> -Chris MacDonald