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 Forum index » DIY Hardware and Software » Thomas Henry designs
Layout for Thomas Henry's LM VCO
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softfin



Joined: Oct 11, 2006
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PostPosted: Thu Nov 08, 2007 3:30 pm    Post subject: Layout for Thomas Henry's LM VCO
Subject description: An Analog Synthesizer for the 21th Century
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Here's a layout for Thomas Henry's LM VCO.
The schematic can be found from his book An Analog Synthesizer For the 21th Century.

This is my most complex layout this far, so I can't promise with 100% certainty that it would be free of errors, but I've checked it various times and everything should be ok. I have also built it and verified it works.

C10 is off board and connected directly to the AC/DC switch.


Thanks to Thomas Henry and Magic Smoke Electronics for allowing me to post this, also thanks to Coriolis and Tim Servo for improvement suggestions.


LM_VCO.pdf
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 Filename:  LM_VCO.pdf
 Filesize:  965.3 KB
 Downloaded:  1546 Time(s)


Last edited by softfin on Thu Nov 08, 2007 4:33 pm; edited 1 time in total
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xpmtl



Joined: Aug 10, 2007
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PostPosted: Thu Nov 08, 2007 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Pin 16 of IC 1 is not connected to anything. Shouldn't it be tied to +15v via a 56K resistor?
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softfin



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PostPosted: Thu Nov 08, 2007 4:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for pointing that out!
It seems I accidentally deleted R30 during my last modification of the layout. It's now corrected Smile I also separated the pcb and overlay to two pages and improved the quality of the pdf.
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forbin



Joined: Jan 29, 2009
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PostPosted: Thu Jan 29, 2009 5:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the layout! Worked well...
http://forbinthesynthesizer.blogspot.com/
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softfin



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PostPosted: Thu Jan 29, 2009 10:16 am    Post subject: Reply with quote  Mark this post and the followings unread

forbin wrote:
Thanks for the layout! Worked well...
http://forbinthesynthesizer.blogspot.com/


Glad to hear that!

Btw, welcome to electro-music!
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CJ Miller



Joined: Jan 07, 2007
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PostPosted: Sun May 17, 2009 2:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

This VCO is very much like the first useful ones I made, but mine were only tri and square. I had made dozens of 555-based oscillators and also used those as linear VCOs. But my layout skills were so poor that my perfboard tries at better VCOs never worked - except as AM radios! I had never soldered any projects bigger than a couple of 555s and I was determined to make an ASM-1 VCO. This was before I had internet to ask anybody, eventually I did it like two years later.

I learned about the 13600 and thought that it looked like one of the most useful synth chips ever... I built a synth out of 13600 VCOs, VCFs, and VCAs. I never enclosed it, the boards just sat on the table. I only got around to experimenting with envelopes around when I moved and put it away, about 1999.

It's making me a nostalgic fool, but these are cool VCOs. Cheap, easy, and they sound great. Mine didn't track so well on the high end, but I was amazed that it even worked. They kept me from throwing in the DIY towel. Also, if you look at the 13600/13700 datasheet, you'll see that this is easily adapted to a quadrature VCO.
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adambee7



Joined: Apr 04, 2009
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PostPosted: Thu May 21, 2009 6:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Could you reupload the PDF. I've tried downloading it but it seems to be corrupted.

Cheers
adam
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Junk Rhythm



Joined: Jan 07, 2008
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Location: San Francisco, CA

PostPosted: Thu May 21, 2009 7:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

adambee7 wrote:
Could you reupload the PDF. I've tried downloading it but it seems to be corrupted.


Try downloading again. It just worked for me.
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adambee7



Joined: Apr 04, 2009
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PostPosted: Fri May 22, 2009 12:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Tried to dowload again but says file damaged or corrupted. I have updated acrobat but still computer says no. will try it on my mates pc later.
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fonik



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PostPosted: Tue May 26, 2009 5:28 am    Post subject: Reply with quote  Mark this post and the followings unread

adambee7 wrote:
Tried to dowload again but says file damaged or corrupted. I have updated acrobat but still computer says no. will try it on my mates pc later.

i have these issue here at work from time to time for a few weeks now. did adobe publish a new version again? i am still using AAS 5 here.

but i can open above file without errors!

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Tim Servo



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PostPosted: Wed Jun 03, 2009 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Tried with Acrobat 5, and could not open the file (errors). Tried with Acrobat 8 and it opened no problem!


Tim (definitely NOT an acrobat) Servo
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