Furby : pitched or fried ?

[haarp]

hi everyone

another one noobish question with my bad english

I already fried 3 furbies (luckily found in a flea market for 2€) by poking them anywhere
Now the last one is prepared to be bend ... or fry but I'd like to avoid that
I found different glitches and short loops but no pitch control I hadn't search so much out of the central and sound chips because I fried others by doing that)
Maybe you read my previous posts so you understood that I'm a real noob in electronic and I recently started circuit bending
So please, can you help me to find this pitch control with board scan or explanations

ps: there's a crystal oscillator near the sound chips, which is its use ?

[beatpoet]

Check out these links for furby bending tips:
http://kenholloway.blogspot.com/2007/02/very-very-simple-guide-to-furby-circuit.html
http://kenholloway.blogspot.com/2007/03/furby-circuit-bending-guide-part-2.html

I haven't opened one up myself, but these guides should be a good place to start...

[haarp]

thanks for your contribution but I already read these tutorials, they helped me to start but didn't tell anything about pitch control,
I dug the web for a while to find this bend but I can't find anything but pictures of few people who find a pitch, no boards scan

on the other hand I found this interesting pages
http://mechatronics.mech.northwestern.edu/design_ref/other/Furby_schematics.html
it doesn't help me to find my fu****'pitch ... maybe it will help someone of you ?

[the_zombiest]

the processor clock in a furby is controlled by a ceramic resonator. The only way to pitch these that I know of is to replace the ceramic res with an external oscillator. check this page for further info on oscillators.
Hope this helps.

[haarp]

ok, I'll try to build an osc like these, many thanks for your help