| Sell a simple, cost-effective, stable, accurate VCO? |
| Where have you been all my life -- this is exactly what I have been waiting for! |
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77% |
[ 21 ] |
| No, I have too many VCOs already. |
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0% |
[ 0 ] |
| No, I only like VCOs that drift and don't track over more than 3 octaves. |
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3% |
[ 1 ] |
| No, your external waveshapers are too weird. |
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7% |
[ 2 ] |
| No, we don't use VCOs around here. |
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7% |
[ 2 ] |
| What's a VCO, and why would I want one? |
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3% |
[ 1 ] |
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| Total Votes : 27 |
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| Author |
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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 Posted: Thu Dec 11, 2008 3:02 pm Post subject:
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Hmm how could i mis this tread?
Count me in! |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Thu Dec 11, 2008 10:02 pm Post subject:
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| Rykhaard wrote: | My 2nd VCO built for my current modular in early 2006 was a stripped down version of Ian's VCO that were up on his web page then. I even substituted cheaper opamps as I didn't have the 'big bux' then to buy the more expensive OP opamps.
And my self-made stripped down version of Ian's VCO from then (even with a metalized polyester film cap.) is working WONDERFULLY!
Many credits to Ian for that design back then. I was going to build more of them, but have since switched to Ken Stone / Ray Wilson PCBs for my VCOs.
I may be looking at the new sliders based one. Cost dependant though.
And now a stripped down version redone from Ian, I'll be watching the price for. If it's compatible with my wallet, I may then shift to them. (I'm again as I did in the 90's, building my own wave shapers, into a separate panel.) |
I AM flipping once again. Having switched back to Press N Peel, I did a new layout of my stripped down version of Ian's VCO from his web page (way back when) to build more of them with PnP. It'll save me money from ordering the other 2.
(I'll also be building more of Thomas Henry's triangle VCOs from his 3080 book as my 1st 2 are working wonderfully at 1V/oct. over 3 octaves, with 2 surface mount tempcos and a pair of standard 2N's trannies, just touching each other. They were mainly intended as VCLFOs, but with their stability, I'll be building more as well.)
But if Ian carries through with a stripped down and they're cheap, I may just go with a pile of them.  (Building my own waveform converters of course, as I had back in the 1990s.) |
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neandrewthal
Joined: May 11, 2007
Posts: 672
Location: Canada
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| Posted: Thu Dec 11, 2008 10:47 pm Post subject:
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I could be down for maybe 8 of these. I wan't to make dual osc 4 voice paraphonic pads with a quad sequencer 
However, my definition of a "minimal" VCO at least includes a 50% pulse wave, not that it matters 
_________________
" I went through quite a few trannies til I found one I liked" - Wild Zebra |
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Thu Dec 11, 2008 11:02 pm Post subject:
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| im interested in two most likely. atleast one. stable osc's is exactly what i need for travel!! |
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Luka
Joined: Jun 29, 2007
Posts: 1003
Location: Melb.
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Fri Dec 12, 2008 1:37 am Post subject:
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| am interested if the pcb is extremely compact |
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The Alison Project
Joined: Jul 21, 2006
Posts: 187
Location: Canada
Audio files: 2
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Sun Jan 04, 2009 4:52 am Post subject:
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Hmmm is this gonna die?  |
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loss1234
Joined: Jul 24, 2007
Posts: 1536
Location: nyc
Audio files: 41
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sun Jan 04, 2009 1:04 pm Post subject:
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| mono-poly wrote: | | Hmmm is this gonna die? |
It died a long time ago. DOA, basically. Very little interest generated by the poll. Extreme bashing by the troll. Perhaps Mr. Troll could whip something up for you. He knows what you need.
Ian |
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Sun Jan 04, 2009 1:36 pm Post subject:
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EdisonRex
Site Admin
Joined: Mar 07, 2007
Posts: 4579
Location: London, UK
Audio files: 172
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| Posted: Sun Jan 04, 2009 2:03 pm Post subject:
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| frijitz wrote: | | mono-poly wrote: | | Hmmm is this gonna die? |
It died a long time ago. DOA, basically. Very little interest generated by the poll. Extreme bashing by the troll. Perhaps Mr. Troll could whip something up for you. He knows what you need.
Ian |
21 yeas looking for about 50 or so boards was more interest than the first Klee generated, and that's sold its 3rd round of 100 out since. It's too bad that a good project gets scuttled by Internet noise.
Thanks for the ones you do put out, Ian. A lot of people appreciate your work.
_________________
Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Mon Jan 05, 2009 4:03 am Post subject:
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| Oh well. At least I can go back to my own miniature sawtooth only version PCB of Ian's then. |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Mon Jan 05, 2009 9:55 am Post subject:
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| frijitz wrote: | Here's the schematic, for anyone who would like to try it from scratch.
Ian |
 Whoa!! Thank you greatly Ian! I shall begin PCB layout of it, to give it a go!  |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Mon Jan 05, 2009 10:06 am Post subject:
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| Rykhaard wrote: | | I shall begin PCB layout of it, to give it a go! |
Ryk --
You can possibly just modify the layout of the other one?
Ian |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Mon Jan 05, 2009 10:18 am Post subject:
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| frijitz wrote: | | Rykhaard wrote: | | I shall begin PCB layout of it, to give it a go! |
Ryk --
You can possibly just modify the layout of the other one?
Ian |
Mmmm? I'll have to gander at it. I haven't built one or looked at the schematic since I did the new layout for Press N Peel, but, if it's similar enough, that would save me a couple of hours at least.
A couple of questions, before I order parts - I would like to build the first one as close to your specifications as possible:
Digikey (my main supplier) doesn't list the VN0104 or VN0106 at all. Earlier in this thread, you'd mentioned the BS170, but not which suffix. Digikey is listing a whole range of them, in stock.
Another person in reply to you had mentioned the BS170-DS - but I couldn't find that suffix in the Digikey listing of the ones they have.
What parameters should I be watching for, when I choose which of the BS170's to order?
For the OPA2227 - had you used the OPA2227P or OPA2227PA? ($'d at $10 and $5 respectively, at Digikey.
Final question - you've done your tests with the LM394. IIRC - someone else had said in a different thread that the SSM2210 has minorly better specs. Would there be any troubles in my using it, instead? I keep a constant stock of them for VCOs, VCFs and VCAs.
(As to Digikey - I stick with them and Small Bear Electronics, as both come to me from the U.S. with no duty charges. They are both, my strong preferences, for non-local parts sourcing.)
Thanks for any thoughts. Otherwise, I have or have access to, everything else listed on the schematic. |
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Mon Jan 05, 2009 10:53 am Post subject:
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| Thanks for posting the schematic ian! Much appreciated. |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Mon Jan 05, 2009 11:39 am Post subject:
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| Rykhaard wrote: | | Digikey (my main supplier) doesn't list the VN0104 or VN0106 at all. Earlier in this thread, you'd mentioned the BS170, but not which suffix. |
VN0104 is available from Mouser.
I used just the plain P/N BS170-ND from Digi.
| Quote: | | For the OPA2227 - had you used the OPA2227P or OPA2227PA? ($'d at $10 and $5 respectively, at Digikey. |
2227PA ($3.96 at Digi) is fine. (10uV offset vs 5uV)
| Quote: | | ...you've done your tests with the LM394. IIRC - someone else had said in a different thread that the SSM2210 has minorly better specs. Would there be any troubles in my using it, instead? |
Should be fine.
Ian |
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Rykhaard
Joined: Sep 02, 2007
Posts: 1290
Location: Canada
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| Posted: Mon Jan 05, 2009 11:54 am Post subject:
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| Excellent! Many thanks Ian! I'll get those ordered as well as the 1% resistors that I haven't, in stock. Once I get a couple of 'in the middle backlogs' finished, I'll then set to work on yours. Greatly appreciated! |
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RF
Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28
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| Posted: Mon Jan 05, 2009 12:40 pm Post subject:
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| frijitz wrote: | Here's the schematic, for anyone who would like to try it from scratch.
Ian |
Thanks for posting it, Ian! There are many of us here who appreciate your work!
bruce
_________________
www.sdiy.org/rfeng
"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963) |
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Tue Jan 06, 2009 5:10 am Post subject:
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| Thanks for sharing Ian! |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Tue Jan 06, 2009 8:50 am Post subject:
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| RF wrote: | | Thanks for posting it, Ian! There are many of us here who appreciate your work! |
Thanks Bruce. As you can see, the design is just another modification of the Terry Michaels EN 62 circuit. Not exactly rocket science or anything. But certainly better performance than most of the other variants.
Ian |
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guatis
Joined: Jan 18, 2009
Posts: 10
Location: Philippines
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| Posted: Mon Jan 26, 2009 7:51 pm Post subject:
Sync? |
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Hi Ian,
What would be the best possible way to implement an external sync input on you SAW CORE? . Should it be something similar to the MFOS Vco? Any thoughts on this?
cheers
Ben |
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Fetafarmer
Joined: Jul 29, 2007
Posts: 32
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| Posted: Tue Jan 27, 2009 2:32 pm Post subject:
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| frijitz wrote: | | mono-poly wrote: | | Hmmm is this gonna die? |
It died a long time ago. DOA, basically. Very little interest generated by the poll. Extreme bashing by the troll. Perhaps Mr. Troll could whip something up for you. He knows what you need.
Ian |
Well, why should one person's statements be enough to kill off a project for a whole group of interested people? Chin up, my friend! And true, we can build from the schematic, but PCBs are convenient, and can really ease troubleshooting. I hope you won't write this one off yet : )
Cheers,
Kevin |
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