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 Forum index » DIY Hardware and Software » Thomas Henry designs
X-4046 VCO Page is Up
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TekniK



Joined: Aug 10, 2008
Posts: 1062

PostPosted: Fri Mar 04, 2011 4:12 am    Post subject: Reply with quote  Mark this post and the followings unread

My mate told me the layout,yes its abouth the sine shape
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spitfire



Joined: Jan 06, 2011
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PostPosted: Sat Mar 05, 2011 4:23 am    Post subject: Reply with quote  Mark this post and the followings unread

my sine wave doesn't work at all
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Mar 05, 2011 5:31 am    Post subject: Reply with quote  Mark this post and the followings unread

so if no-one who built itwith ryk's layout wants to chime in, i recommend doing a debug as usual. grab out the original schematic from thomas henry and check the board against it, starting with the sin shaper portion. check all connections and values, transistor orientation an so on. i call this greenlining, since i use a green pen to check off everything on the schematic that is okay.
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Badcluster



Joined: Mar 07, 2011
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PostPosted: Mon Mar 07, 2011 7:19 pm    Post subject: Vco
Subject description: Vco
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Fonik can you share your PCB?

Tks
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magneticstripper



Joined: Jan 12, 2009
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PostPosted: Mon Mar 07, 2011 10:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

There is an error in the sine shaper with the connection of the 10k feedback resistor.
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Mar 16, 2011 3:22 pm    Post subject: Re: Vco
Subject description: Vco
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Badcluster wrote:
Fonik can you share your PCB?

Tks

i got a go from thomas! so i will start to work on it. for me i made two layouts, one for the core and one for the waveshapers. i could combine them (which would safe money and logistic efforts), or leave them seperate (which would allow the usage of the shaper for other saw core vco's).
suggestions?

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a100user



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PostPosted: Thu Mar 17, 2011 12:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Excellent news Fonik and a big thanks to Thomas too Very Happy
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whomper



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PostPosted: Fri Mar 18, 2011 6:26 am    Post subject: Reply with quote  Mark this post and the followings unread

I would very much like to have shapers stand alone as I am looking to add 2-3 shapers to my already crowded modular.
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fonik



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PostPosted: Fri Mar 18, 2011 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

this is how the PCBs look like (without any changes). if most would be fine with them i could make them available next month...

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mattias



Joined: Jan 26, 2010
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PostPosted: Fri Mar 18, 2011 12:13 pm    Post subject: Re: Vco
Subject description: save energy
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fonik wrote:
so i will start to work on it. for me i made two layouts, one for the core and one for the waveshapers. i could combine them (which would safe money and logistic efforts), or leave them seperate (which would allow the usage of the shaper for other saw core vco's).
suggestions?


I'm selfish and vote for the solution that consumes the least energy of fonik, so he can come up with further cool projects. Wink

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Danno Gee Ray



Joined: Sep 25, 2005
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PostPosted: Fri Mar 18, 2011 5:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

The way they are now would be good for me.

I second Mattias' sentiments !
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vtl5c3



Joined: Sep 08, 2006
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PostPosted: Sun Mar 20, 2011 9:30 am    Post subject:   Reply with quote  Mark this post and the followings unread

Frikkin Awesome!!! I'll order at least two sets.

fonik wrote:
this is how the PCBs look like (without any changes). if most would be fine with them i could make them available next month...

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diablojoy



Joined: Sep 07, 2008
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PostPosted: Sun Mar 20, 2011 9:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

good enough for me too mathias
will of course also take 2
perhaps a short announcement on your forum page listing a link back to here
for interest to be expressed if it's ok with thomas of course
i almost didn't see it
i think many might be interested and may miss it
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dnode



Joined: Aug 07, 2009
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Location: Nederland

PostPosted: Tue Mar 29, 2011 4:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I would definitely be interested in two boards! With separate waveshaper boards I would even buy two shapers extra!

Thomas, Scott and Matthias, great work!

grtz, dnode
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fonik



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PostPosted: Tue Mar 29, 2011 5:58 am    Post subject: Reply with quote  Mark this post and the followings unread

i just came back from a business travel and will take care of this project from now on...
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reve



Joined: Feb 23, 2008
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PostPosted: Tue Mar 29, 2011 11:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Awesome!

I'd be in for 2-8 cores depending on price and a couple shapers.

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raoulblues



Joined: Oct 31, 2007
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PostPosted: Thu Mar 31, 2011 10:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

2 of each for me as well, thanks Matthias
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fonik



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PostPosted: Thu Mar 31, 2011 11:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks, guys.
place orders her, please:
http://electro-music.com/forum/topic-47213.html

we should not pollute this thread with the PCB stuff, but use it for circuit related talk. Very Happy

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spitfire



Joined: Jan 06, 2011
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PostPosted: Sat Apr 23, 2011 6:56 am    Post subject: Reply with quote  Mark this post and the followings unread

hello again.

I get about one octave with my x4046. Is that because I didn't matched the transistors, or because not +-15V, but -+12V, or because my CD4046 is not the right IC ?
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MirlitronOne



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PostPosted: Mon May 02, 2011 5:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Scott, did you ever test the RCA 4046s? Apologies if I missed the results somewhere.
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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Thu May 26, 2011 2:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Now that I've come back to designing and building again a few weeks ago, I found the quad PnP printout of the 4046 VCOs of mine. I searched for the error mentioned (in the Sinewave section).
In case it matters to anyone that still has one of their's lying around with the non-working Sinewave output - there's a 10k feedback resistor at the opamp connected to the transistor pair. It's wired between (on the PCB) the + and - pins of the opamp. It should be the - and output pins instead.

As to the error mentioned about the power supply connections to the opamps being incorrect - all of those connections, were just double verified, as correct.

I'll be building at least 1 of these VCOs as well as soon as I finish the alpha version of my Moog 960 sequencer clone / upgrade. (Hopefully within a few days from now.)
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Sebo



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PostPosted: Thu May 26, 2011 4:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Rykhaard for the update, I etched a PCB from your layout, and will start to build the VCO soon.
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Aum Generator



Joined: Aug 15, 2011
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Location: Bratislava

PostPosted: Sat Sep 10, 2011 8:44 am    Post subject: Reply with quote  Mark this post and the followings unread

hello everyone
is there some easy way, how to build these with voltage controled SKEW of the rampoid?
( am going to build on fonik's pcbs)
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warpboy



Joined: Jun 09, 2010
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PostPosted: Fri Sep 23, 2011 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread

hello,
I'm currently trying to build 4046 vco with Ryk's layout.
I can see on the schematic many 10nF (2 by IC) but on the part placement I don't see where I've to soldier them....
I joined the schematic .

any idea ?

thank you

Fabien


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fonik



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PostPosted: Tue Oct 04, 2011 8:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Aum Generator wrote:
hello everyone
is there some easy way, how to build these with voltage controled SKEW of the rampoid?
( am going to build on fonik's pcbs)

replace the skew pot by two vactrols.
while the resistane of one vactrol increases the other has to decrease, so you would need additional opamp circuitry to drive the diodes.

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