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 Forum index » DIY Hardware and Software » Thomas Henry designs
XR-VCO build report and praise!
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Scott Stites
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PostPosted: Wed Aug 13, 2008 9:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Bottom of the pot is where the -15V is hooked up to the pot. It's the bottom tab of the pot as seen on the schematic. Very Happy
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a.b.o.z.



Joined: Feb 07, 2007
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Location: Zagreb, Croatia
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PostPosted: Wed Aug 13, 2008 9:40 am    Post subject: Reply with quote  Mark this post and the followings unread

got it, thank you sir.

I've found that 68k resistor is ok. Range is now from 2 to 10.

Thnx again


Ivan
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Scott Stites
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PostPosted: Wed Aug 13, 2008 9:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool
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zthee



Joined: Feb 20, 2008
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PostPosted: Thu Aug 14, 2008 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

I soldered a 100K resistor. It's perfect in one of the XR-VCOs - the other VCO could have used a 68K instead.

I'd say go for 68K - and you'll be on the safe side Smile
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a.b.o.z.



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PostPosted: Thu Aug 14, 2008 2:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've tried with 100k but skewing then started around 4-5.
With 68k started around 2 wich is better for me Very Happy
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slo



Joined: Feb 18, 2007
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PostPosted: Sat Dec 13, 2008 5:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Horrible little video I made of a XR-VCO I have been working on, (BugBrand PCB design) with Octave switching and LFO. As you can see it goes a tad sharp when switched , about 15 cents. Do you think I should try to correct that or is it good enough? Oddly when breadboarded, with the 2 mylar caps it switched perfectly. I can see it's going to be a wonderful addtion to my modular.

http://ca.youtube.com/watch?v=BOtrf-zPOFs
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Appliancide*



Joined: Jul 04, 2007
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PostPosted: Wed Dec 17, 2008 4:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Could a lf412 be be used instead of the 442 or would I be better off using half of a 444? I am going to try to breadboard this.

Paul

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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Thu Dec 18, 2008 12:31 am    Post subject: Reply with quote  Mark this post and the followings unread

*Appliancide* wrote:
Could a lf412 be be used instead of the 442 or would I be better off using half of a 444? I am going to try to breadboard this.

Paul


I'm very curious about this, as I'm going to be ordering some LF411 and LF412CN's for my 1V/oct. sequencers as well. (Lower offset V).
I'm also going to be building my first XR VCO within a few days, if all goes well. Smile

Mmmm. I'll see if I kin figure it, checking the datasheets for both. Smile
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