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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
40106 Lunetta VCO
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synthmonger



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PostPosted: Fri Jul 16, 2010 10:43 pm    Post subject: 40106 Lunetta VCO
Subject description: meant to post this a while ago....
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Leave off the sync and sloppy sawtooth output if you just want a 1ms pulse wave. I'd suggest running it through frequency dividers for a better square.


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PostPosted: Fri Jul 16, 2010 10:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey thanks HEAPS for posting this! I've just been mucking around with some 4093's... this will be my next module. What's sloppy about the sawtooth? I guess I shall have to breadboard this and find out! I'm sure this will be a popular posting! Very Happy
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synthmonger



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PostPosted: Fri Jul 16, 2010 11:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

It needs a buffer if you want it to be a 'perfect' looking sawtooth.
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tjookum



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PostPosted: Sat Jul 17, 2010 1:43 am    Post subject: Reply with quote  Mark this post and the followings unread

nice design synthmonger, it reminds me of the WSG oscilators. Ill try it out on the breadboard next week, thanks for posting it.
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PostPosted: Sun Jul 18, 2010 5:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm... not working yet. Am I right in assuming I'll get no sound until I have something hooked up to the CV? I won't hear an oscillation until I have an input there? This is the first VCO I am trying to make, so apologies if the answer is obvious or I am doing something wrong. Also, why is there mentioned a low value cap, or omit? Surely it wouldn't oscillate without a cap would it?
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PostPosted: Sun Jul 18, 2010 5:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

ok getting some sound now. I guess the real issue here is that I don't really understand this VCO concept. Not sure what it has supposed to do. Embarassed That's ok, I'll just have to do a bit of research. At least I'm getting some noise out of it....
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PostPosted: Sun Jul 18, 2010 5:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

OK, Think I get it now! The tone is changing depending on the voltage being fed to the cv!!! Shit I'm stupid sometimes!!! Laughing I had the cv hooked up to the (+) rail just for a test... then I put a random resistor in between, and the tone changed. Another resistor at random gave a different tone again. So, what I'm thinking is the output from an R2R ladder with various outputs feeding the R2R, hooking the R2R output to CV in of the VCO..... Might try that. All this VCA VCO R2R RIP VD KGB CIA shit gets a bit confusing for my battered old brain!

...don't worry about me.... no cause for alarm! No need for the men in white coats.... just carry on with your soldering.... and forget everything I just said... Rolling Eyes
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Rykhaard



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PostPosted: Sun Jul 18, 2010 8:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

-minus- wrote:
OK, Think I get it now! The tone is changing depending on the voltage being fed to the cv!!! Shit I'm stupid sometimes!!! Laughing I had the cv hooked up to the (+) rail just for a test... then I put a random resistor in between, and the tone changed. Another resistor at random gave a different tone again. So, what I'm thinking is the output from an R2R ladder with various outputs feeding the R2R, hooking the R2R output to CV in of the VCO..... Might try that. All this VCA VCO R2R RIP VD KGB CIA shit gets a bit confusing for my battered old brain!

...don't worry about me.... no cause for alarm! No need for the men in white coats.... just carry on with your soldering.... and forget everything I just said... Rolling Eyes


Donchya love it when stuff clicks in? Very Happy AYE! Get the output of the R-2R cranked into there and start phreakin'! Very Happy

Your white cost is almost due back from the cleaners. I'll forward it to you, when it arrives. Wink
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synthmonger



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PostPosted: Sun Jul 18, 2010 9:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you have a potentiometer hooked up like it is in the schematic you'll get audio on either pins 1 or 2. The potentiometer acts as a voltage divider so you'll be able to sweep a few octaves. The CV input is just for additional modulation, you can add more by copying the CV input too.

Don't feed it negative voltages or anything above the supply voltage or you'll risk frying the chip.

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PostPosted: Sun Jul 18, 2010 11:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

HA HA! Thanks for the replies! White coat? Oh... you must mean my straightjacket! Laughing

I'm going to beadboard this up again... I was a bit messy first time around. I'll get a R2R feeding the CV input. Be back later... have to have a little lay down in my padded cell for a while... just got back from my walk to town for an IC buying spree.... Wink
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