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OSC303 PWM mod. ?
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Author OSC303 PWM mod. ?
echoplex
Veteran Wiggler


Joined: 26 Feb 2011
Last Visit: 01 Sep 2014

Posts: 589
Location: Cologne | Germany

PostPosted: Fri Apr 29, 2011 12:14 pm    Post subject: OSC303 PWM mod. ? Reply with quote Add User to Ignore List

OSC303 by Din Sync is a great sounding oscillator!

The only thing I miss is the option of PWM.
Is there any modification to have the option of PWM?

I remember a thread in which somebody mentioned PWM modification on OSC303..
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Dirk95100
Wiggling with Experience


Joined: 20 Apr 2011
Last Visit: 21 Dec 2011

Posts: 311

PostPosted: Sat Apr 30, 2011 8:01 am    Post subject: Reply with quote Add User to Ignore List

http://forums.adafruit.com/viewtopic.php?f=13&t=6389&sid=fd2299771cc4b c74e952bee72c4cc369

I think Phono is lurking here to, so if he could chip in that would be Rockin' Banana!
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phono1337
2SK30A-O


Joined: 29 Nov 2009
Last Visit: 01 Sep 2014

Posts: 1001
Location: temple of x0x

PostPosted: Sat Apr 30, 2011 8:20 am    Post subject: Reply with quote Add User to Ignore List

Dirk95100 wrote:


I think Phono is lurking here to, so if he could chip in that would be Rockin' Banana!


im am lurking indeed, i also made the OSC303 lol

that old thread is valid since its the same resistor number, but i did post something on here more recently which is more relevant

http://www.muffwiggler.com/forum/viewtopic.php?t=31693&postdays=0&post order=asc&start=15

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echoplex
Veteran Wiggler


Joined: 26 Feb 2011
Last Visit: 01 Sep 2014

Posts: 589
Location: Cologne | Germany

PostPosted: Sat Apr 30, 2011 8:55 am    Post subject: Reply with quote Add User to Ignore List

Oh great, that sounds simple.
Have you already tried this and built one with PWM modification?

@Paul: adapting the modification using a LED&LDR Combo (which is a vactrol) is a cool idea but vactrols are not fast! They are slow and time-lagging..
So isn't this a problem using vactrols to make a cv control?
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phono1337
2SK30A-O


Joined: 29 Nov 2009
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Location: temple of x0x

PostPosted: Sat Apr 30, 2011 9:02 am    Post subject: Reply with quote Add User to Ignore List

echoplex wrote:
Oh great, that sounds simple.
Have you already tried this and built one with PWM modification?

@Paul: adapting this using a LED&LDR Combo (which is a vactrol) is a cool idea but vactrols are not fast! They are slow and time-lagging..
So isn't this a problem using vactrols to make a cv control?

edit:@paul: the audio links it his adaffruit forums don't work anymore cry


yeah its pretty old links ive moved a lot of stuff from my webspace recently, dont think i have them anymore.

There are several ways to do it, google voltage controlled resistor for some ideas.

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Kakihara
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Joined: 30 Mar 2009
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PostPosted: Sat Apr 30, 2011 11:36 am    Post subject: Reply with quote Add User to Ignore List

owwww nice!!! Gonna do that soon hehehe

g.

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Heathfinnie
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Joined: 14 Apr 2009
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PostPosted: Sat Apr 30, 2011 1:33 pm    Post subject: Reply with quote Add User to Ignore List

Wish I could still get one of these...
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phono1337
2SK30A-O


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Location: temple of x0x

PostPosted: Sat Apr 30, 2011 1:37 pm    Post subject: Reply with quote Add User to Ignore List

Heathfinnie wrote:
Wish I could still get one of these...


the CCCP version will be released later this year w00t

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sparks
Acid Connoisseur


Joined: 04 Jun 2009
Last Visit: 29 Aug 2014

Posts: 87
Location: Tidaholm

PostPosted: Sat Apr 30, 2011 2:00 pm    Post subject: Reply with quote Add User to Ignore List

I've got two of 'em badboys and they get more use then my other OSCs put together. Love em, by far the most Bang for the buck I put in my rack to
date.

They are pure BUTTAH SlayerBadger!

If history have thaught me anything I'll be on place 1-4 on the waitinglist for the 303VCF.
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Denis Goekdag
Wiggling with Experience


Joined: 02 Jan 2011
Last Visit: 28 Aug 2014

Posts: 342

PostPosted: Sat Apr 30, 2011 2:35 pm    Post subject: Reply with quote Add User to Ignore List

You could use a Doepfer universal Vactrol module I guess.

Another PWM-ish sounding option is to set two OSC303 very close to eachother in frequency, then patch their pulse outputs into the input and cv input of a fast VCA like the Azimuth. The beat frequency between the two OSC303 will then kind of be your PW mod frequency.

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