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 Forum index » DIY Hardware and Software » fonik's place
Thomas Henry's X-4046 VCO - New Edition
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23

PostPosted: Tue Jul 08, 2014 3:05 am    Post subject: Thomas Henry's X-4046 VCO - New Edition
Subject description: PCBs and Eurorack Front Panls
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from time to time people ask me about the Thomas Henry X-4046 VCO and if i would do another run. I think this is due to the fact that this VCO is rather unique. Thomas did an awesome job in utilizing this 4046 IC for a musical VCO with 1V/oct response - something this IC has not been designed for. and the result is a VCO with great features and character.

back in 2012 thomas approached me to try and test a VCO design using this chip. a design that he had developed, and worked on together with scott stites, who did a great job on the documentation fo this design. you will find all necessary information about this VCO here:
http://www.birthofasynth.com/Thomas_Henry/Pages/X-4046.html

i sold PCBs for this project in the past. however, there had been two PCBs, one for the actual VCO core, and another for the waveshaper (sine and pulse). these PCBs were a leftover from the breadboarding/testing. i sold them as they where...

now i decided to do a new design. the prototype PCBs came in recently, i assembled them and they work perfectly. if there was enough interest i would offer them together with a top notch front panel in professional quality, as i did for the 555-VCO.
there will be one PCB containing the actual VCO circuitry, providing MTA-100 footprints for easy manual wiring (if needed/desired), a combined footprint for super matched pairs or your hand matched 2N3904, and another additional adapter PCB carrying the front panel components (eurorack form factor), which could be mounted piggyback to the VCO PCB. the adapter PCB provides an LFO modification as well (mode switch, bi-color LED and LFO timing cap).
____

documentation could be found here:
X-4046-VCO_V2
(if you feel something is missing, just let me know...)
____

pricing:
Bare Main VCO PCB, 7.-EUR/ea
Bare Eurorack Adapter PCB, 7.-EUR/ea
Eurorack Front Panel, 15.-EUR/ea

shipping
international 4.-EUR
deutschland 2.-EUR
(you will pay half the shipping cost when ordering just a single PCB)


i am taking orders until 17 JUL 14
PCBs and panels will be ready for delivery early AUG then.
i am taking no money u ntil the boards/panels are in. i will then contact all who indicated serious interest.


Posted Image, might have been reduced in size. Click Image to view fullscreen.
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Posted Image, might have been reduced in size. Click Image to view fullscreen.Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.Posted Image, might have been reduced in size. Click Image to view fullscreen.

_________________
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cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source

Last edited by fonik on Fri Mar 09, 2018 4:30 am; edited 2 times in total
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StormB



Joined: Aug 15, 2013
Posts: 18
Location: Germany

PostPosted: Thu Jul 10, 2014 12:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
I´m want 2 PCB
Thank you
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feggster



Joined: Sep 12, 2011
Posts: 52
Location: uk

PostPosted: Tue Jul 15, 2014 8:00 am    Post subject: Reply with quote  Mark this post and the followings unread

great stuff!
I would like :
1x vco pcb
1x euro adapter
1x front panel

thanks. Very Happy
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dwhacks



Joined: Jul 18, 2014
Posts: 2
Location: montreal, CANADA

PostPosted: Fri Jul 18, 2014 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great!

I too would take:
1x main PCB
1x Euro adapter board
1x front panel
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AlasdairMoons



Joined: Dec 03, 2011
Posts: 105
Location: East-Belgium

PostPosted: Thu Jul 24, 2014 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Damn mist the timeline ....

if still possible 1 pcb and euro pcb for me .. please

greetings .. sascha

_________________
greetings from belgium, Sascha

my DIY-blog: http://ardvinnamodular.blogspot.be
my DIY Youtube-Channel: https://www.youtube.com/channel/UCWAR64-81C3FbK_Hejz2QHw
my Music-Channel:
https://www.youtube.com/channel/UCzTd_AEK6CVM4gn325wvjYQ
my Facebook:
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ioannis taf



Joined: Sep 19, 2013
Posts: 5
Location: GREECE

PostPosted: Mon Jul 28, 2014 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am late.again.
Sorry, but if it's possible,
please send me
3 x bare main vco pcb and
3 x bare eurorack adapter pcb (international shipping).
Thank you,
Ioannis T.
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Sony Crocket



Joined: Sep 27, 2010
Posts: 13
Location: Madrid, Spain

PostPosted: Sun Aug 03, 2014 7:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Went out for holidays and missed that one. Crying or Very sad

I know it´s too late, but if you order extra/spare pcb´s, I´d like a pair of main pcbs if possible.

Thanks a lot.

David
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drapdap



Joined: Oct 11, 2004
Posts: 204
Location: London
Audio files: 1
G2 patch files: 1

PostPosted: Sat Aug 09, 2014 3:24 am    Post subject: Reply with quote  Mark this post and the followings unread

We ALL missed it Matthias! Very Happy
would have taken 4 or so... did you close down the order for this?
did this happen? Very Happy

robert
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23

PostPosted: Mon Aug 11, 2014 1:04 am    Post subject: Reply with quote  Mark this post and the followings unread

there will be an option for you all, soon. stay tuned.
_________________
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cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
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aerogramma



Joined: Feb 27, 2008
Posts: 156
Location: Roma, Italy - London, UK
Audio files: 13

PostPosted: Mon Aug 18, 2014 9:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've missed it too! Crying or Very sad
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hodad



Joined: Jul 31, 2007
Posts: 41
Location: atlanta

PostPosted: Thu Aug 21, 2014 6:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just got my boards today--thanks!!

I'm wondering if you have docs for this revision yet. A BOM would be very helpful--or do all the parts/part numbers correspond to the parts list at scott stites's site?

Tom
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23

PostPosted: Fri Aug 22, 2014 12:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

documentation could be found here:
X-4046-VCO_V2
(if you feel something is missing, just let me know...)

_________________
Posted Image, might have been reduced in size. Click Image to view fullscreen.
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23

PostPosted: Fri Aug 22, 2014 12:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

you missed the boat?

no problem:
http://www.thonk.co.uk/shop/fonitronik-th-x-4046-vco/

_________________
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cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
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fonik



Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23

PostPosted: Mon Jan 04, 2016 5:03 am    Post subject:  
Subject description: HOT FIX
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ATTENTION

today i learned that the main board layout exceeds the manufacturers tolerances. my fault.

so by now one case has been reported where this led to an actual problem. the middle pin of the coarse pot connector is not only connected to the 100k input resistor (R29), but to the 2k PTC as well (at the opamps output node).

if this happens, everything but the coarse pot will work fine.

my proposal fo an easy fix (also see picture below):
- cut the trace from the middle pin of the coarse pot connector to R29 on the top layer.
- for R29 solder only the leg towards the IC to the board.
- solder a wire from the middle pin of the coarse pot connector to the unsoldered leg of R29.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

_________________
Posted Image, might have been reduced in size. Click Image to view fullscreen.
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
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