OK, How about some other transconductance amplifier. I'm sure National has
a new low voltage version. Or maybe the old guitar gadget favorite the
CA3080(LM3080) is still available. Hmm. I don't see any other parts in the
1993 National Opamp book(the newest I have at home). I'll see what else I
can find.

Actually, you can use just a plain JFET transistor but the control voltage
is not as linear. Not a problem if you use a lookup table.

Cheers,

Bob



At 11:12 AM 11/25/2000 -0200, you wrote:
>Hello Bob Blick,
>
>> If you get the data sheet for the National Semiconductor LM13600 there is
>> an application with a voltage controlled lowpass filter. It uses one half
>> of the chip, six resistors and one capacitor.
>
>    This chip is very interesting, althought National says it's obsolete.
>Can't find a substitute. :(
>
>    Regarads,
>
>    Brusque
>
>-----------------------------------
>Edson Brusque
>Research and Development
>C.I.Tronics Lighting Designers Ltda
>(47) 323-2685  /  (47) 9993-6453
>Blumenau  -  SC  -  Brazil
>-----------------------------------
>
>--
>http://www.piclist.com hint: The PICList is archived three different
>ways.  See http://www.piclist.com/#archives for details.
>
>
>

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.