555 frequency divider in tim's digital octave fuzz

[krachbox]

hi,

could a 555-based frequency divider (like shown in the 555 mininotebook) used in Tim Escobedo's digital octave fuzz? the first xor puts out a square wave, right? so, send that to the divider to get an octave down and mix it with the original. how should i go about mixing the two?
thanks for any suggestions,

janis

[Seljer]

Not sure that would work, as that 555 circuit seems to be dependant on the input frequency, and not just dividing whatever it see in half (hence R1 to adjust), as well as the duty cycle...though that might still give some weird sounds.


I think ripping out the octave down section of an MXR Bluebox would work better:

[edit: I just realised that does 2 octaves down, you only need one half of it for one octave down...but since the chip has 2 parts you may as well use both....]

then something like an opamp mixer to mix in the fuzz/octave up/octave down (like the left section of http://generalguitargadgets.com/diagrams/mixer_sc.gif)
[edit2: no so sure on the mixer, just realised you'd have to adapt it a bit]

[krachbox]

thanks, actually I'm looking for weirdness. this sure needs some experimenting.

[zpyder]

krachbox:

where could I find this 555 mininotebook?

I'm interested in frequency dividing and detection circuits.  Actually I would eventually like to create a circuit that resolves fundamental frequency of a comples wave... a 555 frequency divider might give me a place to start or just some good brainfood

thanks
zpyder

[slacker]

is you want a really easy octave down try using a CD4024 just feed it a squarish wave from an inverter or even just a distorted guitar signal and you can get decent sounding 1 and 2 octave downs out of it.

[Paul Marossy]

where could I find this 555 mininotebook?

I believe that he is referring the "Engineer's Mini-Notebook Series" from RadioShack entitled "555 Timer Circuits". I think those have been OOP for a while now. I have that one on the book shelf at home. 

[zpyder]

Paul-

Yea...!  I believe I have one of those somewhere, covered in dust, and maybe in another city... Maybe I'll have to dig it up

zpyder