[sdiy] New System Solution Diagram - Analog Music Synthesizer

[Harry Bissell Jr]

--- Ian Fritz <ijfritz at earthlink.net> wrote:

> Fighting words!  I totally disagree with you.  What
> is important in a noise 
> transistor is lack of 1/f noise.  I once selected
> through a batch of 50 
> 2N3904's to find the flatest spectrum.  The weakest
> signal one was the 
> best.  I made the mistake of  paying for a 2N2712,
> and it is terrible.  A 
> strong output, but a horrid spectrum.  I never
> thought of trying a 
> supertransistor, but I should have.
> 
>    Ian

Triple Muah-ha-ha then.  I jumped on National Semi
about it.  Here is their reply...

Hello Harry,
Thank you for taking the time to send your comments on
the Analog Music Synthesizer system diagram.  You are
correct, the low-noise transistor pair
LM394 is not a good choice for a noise source.  Based
on your feedback, we are are updating the query that
produces the parts list, so that it only 
shows the LM3046 general-purpose transistor array.  In
a noise generator, one of the LM3046 transistors could
be a noise source, hooked up as a zener or as a diode,
depending on the circuit used.

Regards,
Wanda Garrett
Web Business Group
National Semiconductor Corp.

Now I have to say... Ian may have some valid points.
OTOH National Semi WILL agree with my opinion, as
they want to SELL the product as "low noise" and not
imply that they might be "high noise"

H^) harry