Get more from your VCO!
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Get more from your VCO!

by isak on Sun Mar 04, 2012 3:50 am

Hi Vatos locos.

Did you thought about getting a Triangle wave out of your x0x...? now you can :D
i found this cool thing from http://www.musicfromouterspace.com/
you just take the output signal from the i/o audio output jack, switch to saw wave and it will turn to triangle wave.
here is the schematics..
Image

i did a stripboard layout, so if someone here want to verify my layout that would be great (its my first layout ever made, its ugly i know but i dont care, I LOVE IT :D ).
(if i have any mistakes in the layout please let me know, i'll fix them ASAP and upload the layout again)
Image

enjoy guys,
cheers,
Isak E.
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Re: Get more from your VCO!

by antto on Sun Mar 04, 2012 4:01 am

ehm, the x0x has something like a triangle already
it's part of the square-wave shaper, C11
Image

but this is not going to be interesting for the filter, since it doesn't have sharp edges (aka high-freq harmonics) it won't make the filter resonate as with the sawtooth or square
We are here too: irc.freenode.net >>> #x0xb0x
..:: c0nb0x v1.00 ::.. http://forums.adafruit.com/viewtopic.php?f=7&t=29282 (new control app - win/osx)
VCO Tuning: http://forums.adafruit.com/viewtopic.php?f=12&t=24759 (do it the EASY way)
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 4:19 am

but this is not going to be interesting for the filter, since it doesn't have sharp edges (aka high-freq harmonics) it won't make the filter resonate as with the sawtooth or square

this is why you gotta assemble my layout :mrgreen:
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 5:10 am

there are some mistakes in the stripboard layout

c3 and c5 should be in parallel with c4 and c6
the 12v and -12v lines need to be run up to the opamp
r8 should go to -12v

also note that the frequency out of this
will be half of what you put in
so your x0x will drop an octave

looks cool though
let us know how it sounds
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Re: Get more from your VCO!

by antto on Sun Mar 04, 2012 5:25 am

isak wrote:
but this is not going to be interesting for the filter, since it doesn't have sharp edges (aka high-freq harmonics) it won't make the filter resonate as with the sawtooth or square

this is why you gotta assemble my layout :mrgreen:

if it produces a "triangle" waveform - it still applies - it won't "excite" the filter
try it on any synth which has triangle and a resonant filter
http://www.box.com/s/0c9e1m3dum3s4ky7ij4o ...here's how it might sound
We are here too: irc.freenode.net >>> #x0xb0x
..:: c0nb0x v1.00 ::.. http://forums.adafruit.com/viewtopic.php?f=7&t=29282 (new control app - win/osx)
VCO Tuning: http://forums.adafruit.com/viewtopic.php?f=12&t=24759 (do it the EASY way)
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 6:58 am

thank you for correcting me guest :)

after correction (guest, is it ok?)

Image


also note that the frequency out of this
will be half of what you put in
so your x0x will drop an octave

what should i do for it to stay in the same octave?

if it produces a "triangle" waveform - it still applies - it won't "excite" the filter
try it on any synth which has triangle and a resonant filter

before i sold my sh101 i did a triangle mod it was f***** amazing!
when it went to the vcf section it was sound good.

guys,
how do i pull -12V from the x0x?
can i use it some how from J4 (with extra components i guess) ?

much thanks for your support :)
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 3:07 pm

i was mistaken about the frequency halving
it should be fine

the corrections are correct

i would suggest trying to run it the following way
connect x0x 12v to circuit +12v
connet x0x 5.333v to circuit gnd
connect x0x gnd to circuit -12v
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 4:46 pm

yesssssssssss.............. my first layout :D
i'm so happy about it :)

connect x0x 12v to circuit +12v
connet x0x 5.333v to circuit gnd
connect x0x gnd to circuit -12v

its interesting what your saying here...mmm...can i try doing that to any module that runs on (+)12V / GND / (-12V) ? i mean from J4..
if yes its saving me a lot of troubles.

another professorial question...
lets say i take only the x0x power supply circuit how many modules i can run with it if my wall wart is 9V AC~AC 1A?
lets say i wanna run
2 X VCO'S modules
2 X ADSR
1 X VCF
1 X VCA
2 X LFO
when i think about it i think i know the answer...
its depends on each module mA, right?
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 5:15 pm

you really cant run too much off the x0x powersupply
as its only just an opamp supplying the power
so probably 20ma max
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 6:16 pm

Now it's getting interesting :)

I have a regulated 12V from MFOS, i know that I can run few modules with it.
http://www.musicfromouterspace.com/anal ... SUPPLY.php
I want to run the x0x vco with it, I know it's possible I'm just not sure how to do it.
x0x vco needs 5.33V and 12V and GND.
I think I will need 7805 regulator with trimmer to get 5.33, am I right?
I know I will need more parts I'm not sure which parts.
Can you advice me please?
Maybe can you help with a small schem?

Thanks guest.
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 7:26 pm

i would just use an external powersupply
and not change the x0x powersupply
i think part of the sound comes from the weak powersupply
at least the 12v rail
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 7:30 pm

i would just use an external powersupply

this is what i want to do, but as i understand the VCO needs 2 kind of V.
1 - 5.33V
2 - 12V

how can i get them both with 12V power supply?
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 7:33 pm

if you have a 12v source
you can put another voltage regulator after it
as you suggested a 7805
and adjust it to make 5.333v
although if youre not altering the power for the x0x vco
then it doesnt need to be 5.333v
and just 5v will be fine
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Re: Get more from your VCO!

by isak on Sun Mar 04, 2012 8:04 pm

although if youre not altering the power for the x0x vco
then it doesnt need to be 5.333v

you mean if i only want the x0x vco as a sound generator?

guest, i want to make a synth that based on the x0x vco's, i love this vco, its sounds amazing.
i want to be able to control the vco with cv.

and adjust it to make 5.333v

how to i adjust it to 5.33V?
maybe its better to get 7806 and then trim it with a trimmer to 5.33?
is that a good idea?
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Re: Get more from your VCO!

by guest on Sun Mar 04, 2012 8:32 pm

if you are using an external cv
then you wont need exactly 5.333v
you can just retune it for 5v

but if you want to have 5.333v
then i would use an lm317
it is designed to be adjustable
http://diyaudioprojects.com/Technical/V ... ulator.png
r1 is usually 240ohms
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