Pitch Extractor

[Chris MacDonald]

Recently I have been trying out the LM1496 balanced modulator chip for
audio use.  This is hardly a new idea of course, the PAiA 4710 used one
long ago.  I don't think the performance is all that outstanding, but it
is inexpensive (89 cents each at Jameco).  If you're interested, I put
up a schematic of the circuit I've been experimenting with (your mileage
may vary).  There's a link to the file (pdf) on this page:

http://www.evenfall.com/diy/index.html

Also, Jameco still sells the AD633JN for $6.95, which meets your "under
$10" criteria.

Hope this helps,

Chris MacDonald


Scott Bernardi wrote:
> ...
> What do people
> use for multipliers?  AD633's seem very hard to locate; Arrow
> Electronics has ICL8013's listed on their website. I'd like to use
> something more accurate than OTA's, but also don't want to spend over
> $10 per chip.