[sdiy-interim] Anyone try Cool Audio Chips yet?

[Tim Parkhurst]

On 3/25/07, Tim J <bob_aloha at hotmail.com> wrote:
> So has anyone had a chance to give Cool audio ic's a chance?  Comments on
> the bbds and 2164 clones would be appreciated
>
>
> thanks,
> Tim
>

I've tested their 2164 clone in a Thomas Henry VCF design, and so far
I can't tell any audible difference. I have yet to make any
measurements of frequency response and range (and these will be rough,
as my primary tool is an o-scope), but it looks good so far.

As far as the legality of the chips, that's a VERY good question. I
would assume they have somehow secured legal rights to make these
chips, but perhaps it's not necessary if a) their clones aren't exact
copies of the circuitry and b) they're not copying anything still
protected by a patent.

How do other chip companies go about making clones / copies? There are
several companies that make 741s, 072s, 555s, etc, etc. Have they
licensed, or are they merely good at copying (within the limits
mentioned in the previous paragraph)? If CoolAudio is creating illegal
copies, then they certainly are being bold about it. My guess is that
they're using the same processes/tricks/loopholes/licensing agreements
that many many other chip companies use. However, as John B mentioned,
it certainly would be worthwhile to check this out before using
CoolAudio stuff in a commercial product.


Tim (or a clever clone) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein

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