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Thomas_Henry
Joined: Jul 24, 2009
Posts: 170
Location: N. Mankato, MN
Audio files: 3
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 Posted: Tue Jul 06, 2010 5:26 pm Post subject:
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Hi,
| widdly wrote: | | Would switching a larger capacitor in parallel with C3 allow for an LFO mode? |
Yes, but that is a very sensitive part of the circuit. (The cap is already being tapped by two buffers). I think it might screw up the VCO tuning, so I'd advise against it. The VCO does in fact go subsonic anyway.
| Quote: | | If I left out the sine circuit, am I correct to assume that the Pulse output circuit could be connected to the saw output instead? |
That would work. But if you listen to Scott's first recording on his Web site, I don't think you'll want to leave out the sine. I thought it was best part of his sample!
| Quote: | | Would a 1M pot work for the Rampoid skew control (R53)? |
Yes. Keep the leads direct and to the point, though, since that represents a greater impedance.
Thomas Henry |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Tue Jul 06, 2010 5:43 pm Post subject:
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| Thomas_Henry wrote: | Heya, Rykhaard,
Sure, go ahead and post your artwork here. That would be a real time-saving aid for the rest of the gang. Keep Scott posted as well; he'd probably want to include links to it in his write-up.
And thanks!
Thomas Henry |
:o Otay! :salut: Thank you greatly Thomas and again, as well as for the VCO itself! Just from listening to Scott's audio from it, I fully agree with others that this guy, is going to be a hit! :)
Now - as to how I lay things out for PCBs ... (this one being a little more difficult so far around the first TL074, being single sided) ... wont look pretty. :o But if portions of it may assist someone else in doing a much neater / tidier version, then I'm all for that as well. :)
Last edited by Rykhaard on Thu Mar 17, 2011 2:30 am; edited 1 time in total |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Wed Jul 07, 2010 1:53 am Post subject:
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A big thanks to Thomas for yet another masterpiece.  |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Thu Jul 08, 2010 4:30 am Post subject:
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| Rykhaard wrote: | | Thomas_Henry wrote: | Heya, Rykhaard,
Sure, go ahead and post your artwork here. That would be a real time-saving aid for the rest of the gang. Keep Scott posted as well; he'd probably want to include links to it in his write-up.
And thanks!
Thomas Henry |
Now - as to how I lay things out for PCBs ... (this one being a little more difficult so far around the first TL074, being single sided) ... wont look pretty.  But if portions of it may assist someone else in doing a much neater / tidier version, then I'm all for that as well.  |
K. My single sided PCB layout for the CD4046 1V/Oct. VCO, is completed. I still have to double verify it though before I post it's artwork here, with many great thanks and appreciation to Thomas, for his permission.
As with all of my PCBs, it may be considered ugly to many, but all of the components are labelled (in copper), except for a small # of the trimmer's names. (Their values are there.)
I'll verify the layout on lunch at work today, making any required corrections after work (including addition of the PCB's power input capacitors.) Once that's done, I'll post it to this thread for everyone to gander at. It may also be modified at will. I know others who are more familiar with layout rulings etc. that I'm unaware of, would do things differently. Once it's confirmed as correct at least, it'll give me the ability to make a bunch of Thomas's VCOs for myself. |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Thu Jul 08, 2010 3:53 pm Post subject:
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This circuit took a little longer than most do. That's otay though. I verified it at work; found bugs; cleared them up and well ... there're more errors to find yet, apparently. I've pulled the err'd PCB to find and repair the errors.
Last edited by Rykhaard on Thu Mar 17, 2011 2:34 am; edited 3 times in total |
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andrewF
Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4
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| Posted: Fri Jul 09, 2010 6:29 pm Post subject:
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Thanks Thomas for once again going where few dare to venture!!!
and thanks for sharing the layout Ryk
maybe its just me but the rampoid pad looks pretty close to the ground trace, no doubt it will test my P'n'P skill!
I have about twenty 4046s here & they are all TI  |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Fri Jul 09, 2010 6:35 pm Post subject:
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| andrewF wrote: | Thanks Thomas for once again going where few dare to venture!!!
and thanks for sharing the layout Ryk
maybe its just me but the rampoid pad looks pretty close to the ground trace, no doubt it will test my P'n'P skill!
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Thanks for making mention of that Andrew! A LOT of stuff in there is closer than I liked, but I were trying to get away from as many jumpers as I could, juggling everything.
Even though I've printed (PnP) 4 off to cook for myself, I'm going to do another check of it. If there're changes I'll hopefully be able to replace the above one with the new one.
| Quote: |
I have about twenty 4046s here & they are all TI |
Aww no way! That really sux! |
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tjookum
Joined: May 25, 2010
Posts: 360
Location: Netherlands
Audio files: 26
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| Posted: Sat Jul 10, 2010 1:22 am Post subject:
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Coming over from the lunetta forum, the 4046 caught my eye. I now see this is a toally different beast, and Im liking what I see. This could very well be my first actual VCO.
Thanks thomas henry, this looks and sounds great!
Great work on the pcb ryk, must have been hard cramming it onto this single sided board. With my lack of experience on making pcb's, I guess I'll wait for the finalized version.
keep up the good work 
_________________
There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson
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drapdap
Joined: Oct 11, 2004
Posts: 204
Location: London
Audio files: 1
G2 patch files: 1
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| Posted: Sat Jul 10, 2010 10:25 am Post subject:
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Rykhaard!
i really hope you don't mind, but i converted your neat pcb for pnp, as i'm keen to try this one out, it still might be too funky for some, but i guess it goes for this one, just want to give it a try, i might make a proper pcb with power connectors if i've got one going, but i thought i'll share this, it's your work after all, i just cleaned it in vain so one can try it. Thank you Thomas, thank you Ryk! It will be next to my 566 vco's.
also, im really looking forward to the vcf Thomas and Scott been teasing us here... Any info on that? And there's also another cmos vco? 4069?
róbert
| Description: |
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Download (listen) |
| Filename: |
thomas_henry_4046_vco_122_pnp.pdf |
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2.13 MB |
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3138 Time(s) |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Sat Jul 10, 2010 2:14 pm Post subject:
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| drapdap wrote: | Rykhaard!
i really hope you don't mind, but i converted your neat pcb for pnp, as i'm keen to try this one out, it still might be too funky for some, but i guess it goes for this one, just want to give it a try, i might make a proper pcb with power connectors if i've got one going, but i thought i'll share this, it's your work after all, i just cleaned it in vain so one can try it. Thank you Thomas, thank you Ryk! It will be next to my 566 vco's.
also, im really looking forward to the vcf Thomas and Scott been teasing us here... Any info on that? And there's also another cmos vco? 4069?
róbert |
Whoa! That must have taken you a heck of a long time for editing! I don't mind at all! With Thomas's permission coming to me without my asking, I'm completely open to anyone changing it, in whichever way.
My only question: do you have a silk layer to show all of the values everywhere? (Maybe that's why mine looks so crowded, in comparison to yours, which looks so beautifully neat and tidy!
NOTE TO PNP USERS: (as I'm one of them as well.) If you'd like the PNP layout for printing, let me know and I'll post it here as well. You could always just reverse the image I had posted above, anyways. So, that may not matter. (Ahhh. But it will - the silkscreen layouts would have to be removed. Doh, on my part.
Anyhoo - lemme know if anyone wishes for the reversed output of it then, or, the original Express PCB file itself. I can mail it to you. ) |
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State Machine
Janitor
Joined: Apr 17, 2006
Posts: 2810
Location: New York
Audio files: 24
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| Posted: Sat Jul 10, 2010 3:10 pm Post subject:
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Rich
I am impressed with the layout. It looks nice and tight. Nice work on doing it on a single side. Very cool for the PCB DIY crowd. 
PS: Your MC14046 chips should be arriving soon man !
Scott Stites will be testing some RCA chips soon. I have shipped him 5 to run the experiment. The longer the list of chip manufacturers gets, the more options for folks here in our forum. Thanks Scott
Bill |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Sat Jul 10, 2010 3:17 pm Post subject:
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| State Machine wrote: | Rich
I am impressed with the layout. It looks nice and tight. Nice work on doing it on a single side. Very cool for the PCB DIY crowd.
PS: Your MC14046 chips should be arriving soon man !
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Much thank yous Bill! I haven't thought it were the neatest looking but as I've previously explained ...
Here's to major hoping that others can use it and that others DO (use SOME PCB layout, anyways.)
This circuit to me, with the sounds from it that Scott had done, is one beautiful answer for LOW COST VCOs, with a great amount of sonic capability!
And many thank yous for those chips coming! I have a PnP done for 4 boards. If all come out well - there's twice my # of VCOs as soon as they're built / tuned!
Scott Stites will be testing some RCA chips soon. I have shipped him 5 to run the experiment. The longer the list of chip manufacturers gets, the more options for folks here in our forum. Thanks Scott
Bill[/quote]
Ooo! Here's to hoping, especially if RCA is still cranking them out! |
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Scott Stites
Janitor
Joined: Dec 23, 2005
Posts: 4127
Location: Mount Hope, KS USA
Audio files: 96
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Adam-V
Joined: Jan 29, 2007
Posts: 300
Location: Australia
Audio files: 1
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| Posted: Mon Jul 12, 2010 6:48 pm Post subject:
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Nice work guys!
Is anyone considering doing boards and/or kits for this?
Cheers,
Adam-V
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Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
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krellmusician
Joined: Mar 28, 2007
Posts: 11
Location: USA
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| Posted: Sat Jul 17, 2010 9:07 pm Post subject:
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| The 4046 has been one of my top 5 ICs since it first appeared in 1974. Amazing to see a full-featured VCO built around it! I'd be good for 2 or 3 boards (at least) if one becomes widely available. |
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slacker
Joined: Nov 18, 2007
Posts: 301
Location: England
Audio files: 11
G2 patch files: 1
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Tue Jul 20, 2010 4:34 pm Post subject:
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Wow! Excellent to see!
If you're looking for clearance from my layout - please! Go right ahead! I myself am quite surprised that the previous fanfare has almost completely died. |
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Thomas_Henry
Joined: Jul 24, 2009
Posts: 170
Location: N. Mankato, MN
Audio files: 3
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| Posted: Tue Jul 20, 2010 4:40 pm Post subject:
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Hello Slacker,
Yes, please do post your layout. Thanks!
And thanks for the confirmation on manufacturers. I'm still amazed at how rotten the TI chip is for this. It was a good thing I didn't use one myself or I probably would have given up early on.
| slacker wrote: |
A quick question for anyone who's built it, do the trimmers for the wave shaper sections need to be multiturn or are single turn Ok? |
Only the tuning trimmers need be multiturn. The waveforms are easy to tweak with ordinary trimmers.
Thomas Henry |
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tjookum
Joined: May 25, 2010
Posts: 360
Location: Netherlands
Audio files: 26
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| Posted: Wed Jul 21, 2010 9:55 am Post subject:
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| Quote: | | If it's Ok with everyone, I'd be happy to post a layout once I've built the rest of it and tidied it up a bit. |
yes please!
It looks like a nice and compact build, and with the veroboard this is going to be very cheap, good job
_________________
There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson
movies
noise |
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forbin
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Mon Jul 26, 2010 9:27 am Post subject:
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 course is something different than coarse, isn't it?
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cheers,
matthias
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Big Boss at fonitronik
Tech Buddy at Random*Source |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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| Posted: Mon Jul 26, 2010 11:48 am Post subject:
X-4046 VCO Page is Up |
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| fonik wrote: | | course is something different than coarse, isn't it? |
Of course, of coarse.
Tim (my pony has a sore throat, he's a little horse) Servo |
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forbin
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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| Posted: Tue Jul 27, 2010 12:48 am Post subject:
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Well my PCB worked OK -- apart from a missing resistor and a tiny short, which took a little while to find. I used an NXP (Phillips) 4046 and all seems well. Got the expected shapes after a little bit of tweaking. The triangle and sawtooth are a little hot being about +- 5.6V -- I am thinking about changing the feedback resistors slightly. Still need to trim the V/octave controls but I have misplaced my temco's... Also using the PLL discriminator for the extra sync mode still needs some more thought...
Hopefully will be able to tune this tomorrow after a rummage in the shed for the tempco's and post some graphs. I have a Fairchild 4046 as well so will try that for academic interest. |
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slacker
Joined: Nov 18, 2007
Posts: 301
Location: England
Audio files: 11
G2 patch files: 1
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