Latest posts from topic “First XOX Demo - used as a synth” Latest posts from topic “First XOX Demo - used as a synth” on “adafruit industries”. http://forums.adafruit.com/viewtopic.php?f=7&t=1621 Sun, 02 Jul 2006 03:07:53 -0400 mome rath Mon, 03 Jul 2006 20:58:34 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7940#p7940 http://forums.adafruit.com/viewtopic.php?f=7&p=7940#p7940
Good stuff as always, ReWire. And an instrumental at that!]]> kokoon Mon, 03 Jul 2006 14:58:01 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7910#p7910 http://forums.adafruit.com/viewtopic.php?f=7&p=7910#p7910
how about just raising separate voltages for everything but the CV?]]> guest Mon, 03 Jul 2006 13:00:06 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7903#p7903 http://forums.adafruit.com/viewtopic.php?f=7&p=7903#p7903 that should give the same 12v increase
with the 5.333v at 5.333v
assuming you cranked your 5.33v to 5.6v

the width pot will keep the x0x in tune
but it wont ouput 1v per octave to slave other synths to
which is probably not a concern for most people]]> kokoon Mon, 03 Jul 2006 11:16:09 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7902#p7902 http://forums.adafruit.com/viewtopic.php?f=7&p=7902#p7902
what value would you recommend for R178 or R179 replacement? i don't wanna fry the 74AC174... maybe put a trimpot there?]]> guest Mon, 03 Jul 2006 07:09:16 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7895#p7895 http://forums.adafruit.com/viewtopic.php?f=7&p=7895#p7895 would have an effect on the vcf
but here is my current theory

the 12v is a fucntion of the 5.333v via r178 and r179
so as you turn up the 5.33v you are also turning up the 12v
so the gate voltage and subsequent envelope votlages
are all higher
so the vca gets turned on a bit more
and the vcf gets a bit more control voltage
and the gain in the feedback gets turned up a bit
so the frequency response is higher and more resonant

turning up the 5.333 shouldnt have too terrible an effect
the only chip which will care much is the 74ac174
it is run off the 5.333 but only recieves 5v signals
from the microcontroller
since the inputs arent schmitt trigger inputs
there is a chance that the output stage wont turn on fully
and could be sourcing a lot of current internally
this would merely get the 74ac174 really hot until it fried
a pain to replace but not expensive

the other draw back is that the cv is no longer 1v per octave
and that it may not be entirely linear anymore
if the output stages arent working correctly

if r178 was increased or r179 decreased
you could get the same increase in the 12v
without having to change the 5.333v]]> kokoon Mon, 03 Jul 2006 05:37:39 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7894#p7894 http://forums.adafruit.com/viewtopic.php?f=7&p=7894#p7894 that thing with the PS trimpot works perfectly for me, i haven't noticed any degradation in lower end... can you explain what you're hearing a bit more?
if it was possible i'd push that trimpot even a bit further but i'm not sure how it'd effect circuits other than the VCF (digital? VCO?)
i haven't got the slightest idea what it does technically but it sounds right. maybe i'll smoke the machine soon because of that... can anyone say anything about this?]]> REwire Mon, 03 Jul 2006 01:57:37 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7891#p7891 http://forums.adafruit.com/viewtopic.php?f=7&p=7891#p7891
evilxsystems wrote:How much did you pay for it?


$500 for it used, last run. I paid $1000 for my broken 303, this was chump change.

I am thoroughly confused about what's the easiest most perfect way to get the resonance right. I keep reading different suggestions, from trimpots, changing transistors, resistors, testing beta values etc.
Someone needs to just spell it out clearly.]]> CoolColJ Sun, 02 Jul 2006 18:57:19 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7884#p7884 http://forums.adafruit.com/viewtopic.php?f=7&p=7884#p7884

personally I prefer the filter feedback method to boosting resonance]]> evilxsystems Sun, 02 Jul 2006 15:09:09 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7879#p7879 http://forums.adafruit.com/viewtopic.php?f=7&p=7879#p7879
just curious]]> REwire Sun, 02 Jul 2006 10:50:43 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7875#p7875 http://forums.adafruit.com/viewtopic.php?f=7&p=7875#p7875 sash Sun, 02 Jul 2006 03:59:17 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7872#p7872 http://forums.adafruit.com/viewtopic.php?f=7&p=7872#p7872 sash Sun, 02 Jul 2006 03:57:23 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7871#p7871 http://forums.adafruit.com/viewtopic.php?f=7&p=7871#p7871 I have my x0x327 kit still unbuilt and I plan to decrease R108 to 2k (not 1.8k as proposed) and increase R 112 to 22k, but will use a socket for R108 (if it's too whistling, i'll go back to 2.2k).
I heard also that the 2sc536F transistor at Q11 should be the highest beta (hfe), let's try...]]> REwire Sun, 02 Jul 2006 03:07:53 -0400 http://forums.adafruit.com/viewtopic.php?f=7&p=7870#p7870 http://forums.adafruit.com/viewtopic.php?f=7&p=7870#p7870 First XOX Demo - used as a synth
http://REwire.12inch.com/Audio/Demos/RE ... OX_ROX.mp3 (mp3 128mbps 3:27)

Thanks for checking it out and hope this shows the range of the XOXBOX.
Dan

P.S. I went to see how my 303 was doing today and heard it for a moment and went ,"Ick - that's what the real thing sounds like, so nasally and weak!"]]>