[sdiy] Digital Noise, FYI

[Dave Manley]

On 2/15/2011 11:01 PM, David G. Dixon wrote:
>> For those interested in the digital noise-making I referred to in the
>> eVilBay thread, current design is:
>>
>> 555 ->  CPLD ->  10-bit parallel load DAC
>>
>> ...where the CPLD is set up to be a 10-bit version of that described in
>> Don Lancaster's TTL Cookbook, pages 277 through 281 ("The Pseudo-Random
>> Sequencer.")
>>
>> Settings for "proper" noise and "weird Space Invaders" noise by changing
>> the 555 frequency :-)
>
> That's an awesome circuit, from an awesome book.  It's high on my to-do list
> as well.

For those of us without the book - does he supply the 'polynomial'?  I assume it
is just some LFSR variant - a shift register with some XOR gates connected in
a few places?

-Dave