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 Forum index » DIY Hardware and Software » PAIA Equipment
Idea - X-4046 VCO for Fatman
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JovianPyx



Joined: Nov 20, 2007
Posts: 1248
Location: West Red Spot, Jupiter
Audio files: 161

PostPosted: Sat Jun 02, 2012 1:22 pm    Post subject: Idea - X-4046 VCO for Fatman
Subject description: An adaptation of the Thomas Henry X-4046 VCO for the Fatman
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I had once tried to use a 4046 VCO on my Fatman and I never got it to work. I see the reason in the Thomas Henry X-4046 schematics found here.

I was looking at sheet-0001.pdf how the CV is turned into a current.

The schematic I've posted shows how I would connect the Fatman CV to this VCO and avoid the expo stuff.

Please note that this is 1) UNTESTED and 2) A very basic VCO.

Due to current chaos in my lab, I cannot yet try this, so if someone does and can confirm that it works and has a comparable range to the Fatman VCOs, please post.

Capacitor C is something you'll have to select. It might be from .001 uF to over .01 uF or more. The larger the cap, the lower the pitches it produces.

The output from pin 4 is square. If this works, it should be easy to add the Thomas Henry features to it.

Note that the 4046 is powered with Vdd=ground and Vss=-V. In the schmatic, -V is -12v and +V is +8v. Running this IC "below ground" is required in order to make the voltage to current converter work.


Linear_4046_VCO.gif
 Description:
Linear 4046 VCO Adapted for PAiA Fatman from Thomas Henry X-4046 Schematic
 Filesize:  5.64 KB
 Viewed:  2527 Time(s)

Linear_4046_VCO.gif



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Last edited by JovianPyx on Sat Jun 02, 2012 7:49 pm; edited 3 times in total
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Cynosure
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Joined: Dec 11, 2010
Posts: 692
Location: Toronto, Ontario - Canada
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PostPosted: Sat Jun 02, 2012 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool. Does this mean that you will soon be digging out the fatman and testing mods again?
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JovianPyx



Joined: Nov 20, 2007
Posts: 1248
Location: West Red Spot, Jupiter
Audio files: 161

PostPosted: Sat Jun 02, 2012 6:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cynosure wrote:
Cool. Does this mean that you will soon be digging out the fatman and testing mods again?


Smile That is likely I think. I have the portable dug out now, but no place to set it up at the moment.

_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
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