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 Forum index » DIY Hardware and Software » fonik's place
PCBs/Panels for the TH VCF/VCA
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fonik



Joined: Jun 07, 2006
Posts: 3908
Location: Germany
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PostPosted: Tue Oct 20, 2015 3:54 am    Post subject:  PCBs/Panels for the TH VCF/VCA
Subject description: An Synthesizer for the 21st Century
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UPDATE:
Available via
THONK and SynthCube


_________________________________________________

Hi all,

in the past i did some PCBs and Eurorack front panels kits for various Thomas Henry projects: VCO, LFO, ADSR, however a filter was missing.

I got Thomas' permission to do a PCB/Panel combo for his 12db State Variable VCF/VCA module, which is based on a 2164 quad VCA IC. You might know this circuit from his book 'An Analog Synthesizer
for the 21st Century' (Thomas Henry 2006). Together with the other Thomas Henry modules available (thonk/synthcube) one could build a basic stand-alone Thomas Henry synth now.

I just built an prototype and it worked out quite fine. THere are a few klutches on the prototype, however it is understood that these corrections will be incorporated in the PCBs i will sell.

A front panel is in the works, too. I hope i can get all done before christmas.

Prices will be reasonable (IMHO), same ballpark as for my other Thomas Henry projects.

The sound of the filter is quite vanilla, it is selfoscillating and trimmable to 1V/oct. Sounds to follow.

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.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
TH-VCF-VCA-FP by Matthias Herrmann, on Flickr

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cheers,
matthias
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Last edited by fonik on Tue Sep 05, 2017 1:11 pm; edited 2 times in total
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donpachi



Joined: Jul 16, 2009
Posts: 77
Location: Marburg
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PostPosted: Tue Oct 20, 2015 9:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Looking forward to it cyclops
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Oct 22, 2015 2:29 am    Post subject: Reply with quote  Mark this post and the followings unread

raw video of the prototype


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cheers,
matthias
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donpachi



Joined: Jul 16, 2009
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PostPosted: Sat Oct 24, 2015 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
raw video of the prototype


Sounds fantastic! I'm in for two main PCBs, please Cool
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diablojoy



Joined: Sep 07, 2008
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PostPosted: Sat Nov 07, 2015 8:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

looks really good as usual Matthias
finances not great at the moment but will see if I can scrounge up the cash
for a few soon

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bubzy



Joined: Oct 27, 2010
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PostPosted: Sun Nov 08, 2015 1:18 am    Post subject: Reply with quote  Mark this post and the followings unread

tsk, always with the great projects :/

put me down fo 2 pcbs please matthias Smile

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bamboombaps



Joined: Oct 23, 2015
Posts: 60
Location: Glasgow

PostPosted: Thu Jan 14, 2016 5:56 am    Post subject: Reply with quote  Mark this post and the followings unread

seems a bit quiet for a fonik pcb order thread but just in case i miss out, ill have one of everything pls
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Jan 26, 2016 2:01 am    Post subject: Reply with quote  Mark this post and the followings unread

bamboombaps wrote:
seems a bit quiet for a fonik pcb order thread but just in case i miss out, ill have one of everything pls

haha. the big business could be found over at muffs these days, i guess.

i did not manage to order a prototype front panel yet. everthing is going very slow on my side. i cannot help it. life is very challenging sometimes.

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cheers,
matthias
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bamboombaps



Joined: Oct 23, 2015
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PostPosted: Tue Jan 26, 2016 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

I hear ya brother. Thanks for replying
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AlasdairMoons



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

PostPosted: Sat May 14, 2016 2:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

If still to be ordered, I'm in with one pcb ...
Like always .. only the main pcb, no frontpanel .. want it in my 5HE on +- 15v ..

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greetings from belgium, Sascha

my DIY-blog: http://ardvinnamodular.blogspot.be
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Jul 25, 2016 5:45 am    Post subject: Reply with quote  Mark this post and the followings unread

proto panel is in and fits perfecty. more soon.

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
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donpachi



Joined: Jul 16, 2009
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PostPosted: Mon Jul 25, 2016 1:12 pm    Post subject:   Reply with quote  Mark this post and the followings unread

Looks very nice Cool I definitely also want one of those panels/panel PCBs!
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Aug 24, 2016 9:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I had to make a decision: The PCBs and Panels are going to be sold via Thonk, SynthCube, ModularAddict and PerfectCircuit.
At least Thonk will sell single PCBs w/o panel and adapter PCB.

Should be in the shops in 3-4 weeks.

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cheers,
matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Sep 15, 2016 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

In anticipation of the PCBs/Panels hitting the retailers i just uploaded the build documentation.

Thomas Henry 2164 VCF/VCA

(from An Analog Synthesizer for the 21st Century)

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cheers,
matthias
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NoodleDriver



Joined: Jun 22, 2016
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PostPosted: Sun Sep 18, 2016 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Looking forward to this.
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NoodleDriver



Joined: Jun 22, 2016
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PostPosted: Tue Dec 20, 2016 10:18 am    Post subject: Some pics of my build Reply with quote  Mark this post and the followings unread

Very Happy


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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Dec 20, 2016 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Classic manual wiring and DIY panel. That's the right spirit!
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cheers,
matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Sep 05, 2017 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Available via
THONK
and
SynthCube

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cheers,
matthias
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StormB



Joined: Aug 15, 2013
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Location: Germany

PostPosted: Fri Sep 15, 2017 6:43 am    Post subject: 2164Vcf Reply with quote  Mark this post and the followings unread

Hi
i have build the 2164 VCA VCF with a Chip from COOLAUDIO
but i have Problem with the Reso,
if i turn the Poti 75-100 % clockwise the Reso overloaded and
the Audiosignal break
if i disconect the gnd from the Resopot the Problem is gone but
the Reso are not enough for self Oscillation
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fonik



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PostPosted: Fri Sep 15, 2017 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

hi SromB
i changed the resonance circuitry in comparison to the original, since it wokrd better this way. BTW i used the coolaudio part as well.
so you might check the original schematic from Thomas.

besides this, are you sure you use a 1M pot for the resonance?

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cheers,
matthias
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StormB



Joined: Aug 15, 2013
Posts: 10
Location: Germany

PostPosted: Fri Sep 15, 2017 11:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
i have build the VCA VCF from the Book
An Analog Synthesizer for the 21st Century
and I have Check every resistor and every connections
nothing is wrong the only difference is the Resopot
in the Book has the resopot no Connection to Gnd
in Your schematic goes a pin to ground

and I use 1 M pot for Reso
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Sep 15, 2017 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

BTW did you use my PCB?

StormB wrote:
nothing is wrong the only difference is the Resopot
in the Book has the resopot no Connection to Gnd
in Your schematic goes a pin to ground

Thomas' original schematic has the reso pot wired as rheostat, which was the way to do it in the old times, however, at some point it changed to the divider to GND configuration. if i am correct it was Craig Anderton who suggested the divider to GND long time ago...

anyways, it is the first time that i hear about any issue with the circuit.

did you check the potentiometer? when i built my klee2 back then i had a bad pot, and i replaced it just to learn that the new pot was bad, too (16mm alpha, shit happens).

or try to change the value of R24

and/or post in the original thread as well, since Thomas will most likely not track this sub-forum...

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cheers,
matthias
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