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 Forum index » DIY Hardware and Software » fonik's place
PCBs & Panels for a 6HP Cascadable 4ch DC Mixer
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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
Audio files: 23

PostPosted: Thu Sep 12, 2013 5:51 am    Post subject: PCBs & Panels for a 6HP Cascadable 4ch DC Mixer
Subject description: taking orders until 29th of september
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i recently built myself a few simple 4 channel DC coupled mixers, nothing fancy.
and i think they would make a great beginners project.

nevertheless they could be helpful for anybody using eurorack format.
they are cascadable in the sense that you could route the sum of the 1st mixer behind the panel to an additional invisible 5th input of the 2nd mixer (and you could then of course route the sum of the 2nd mixer to the hidden 5th input of the 3rd mixer and so forth).
the sum output has a pot to set the attenuation, however, choosing the right resistor values you can apply gain to sum, too. i will explain that in the forthcoming documentation.

Building Documentation (230kb)

i will offer the PCBs, and 6HP front panels which would match the design for the thomas henry projects.

PRICES
bare PCB = 5.-EUR,
eurorack 6HP front panel = 7.-EUR
packaging&postage 4.-EUR worldwide (deutschland 2.-EUR)
(note: i am NOT taking any money upfront, just wait for me contacting you regarding payment - paypal in EUR will be preferred).

i will take orders until 29th of september,
then i will order the PCB and front panels. so they should be available and ready for delivery mid october.

BTW the sockets are the PJ301-B available from thonk/UK or earthenvar/USA, the potentiometers are 9mm.
the schematic is the common unity gain 2x inverting mixer scheme. simple straight forward. detailed documentation will follow soon.

the PCBs:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Cascadable DC Mixer 6HP (WIP) by fonitronik, on Flickr

partly stuffed:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Cascadable DC Mixer 6HP (WIP) by fonitronik, on Flickr

completed
Posted Image, might have been reduced in size. Click Image to view fullscreen.
DC Mixer Completed by fonitronik, on Flickr

behind the panel
Posted Image, might have been reduced in size. Click Image to view fullscreen.
DC Mixer Completed by fonitronik, on Flickr

_________________
Posted Image, might have been reduced in size. Click Image to view fullscreen.
cheers,
matthias
____________
fonitronik at
FlickR (pix) / SoundCloud (sounds) / YouTube (vids) / Vimeo (vids) / facebook (news)

Last edited by fonik on Tue Jul 08, 2014 3:08 am; edited 2 times in total
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StormB



Joined: Aug 15, 2013
Posts: 6
Location: Germany

PostPosted: Thu Sep 12, 2013 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
i want 2 PCB please
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Level5



Joined: Feb 16, 2007
Posts: 29
Location: Germany

PostPosted: Fri Sep 13, 2013 2:32 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm in with 4 PCB
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Fri Oct 04, 2013 6:44 am    Post subject: Reply with quote  Mark this post and the followings unread

2 full sets please, if I'm not too late...
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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
Audio files: 23

PostPosted: Fri Oct 04, 2013 6:50 am    Post subject: Reply with quote  Mark this post and the followings unread

CLOSED
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cheers,
matthias
____________
fonitronik at
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slo



Joined: Feb 18, 2007
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PostPosted: Tue Oct 29, 2013 4:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Shoot...I would have liked one of these

George
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Tue Oct 29, 2013 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Would it be possible to get the build docs for this?

Many thanks Wink

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LektroiD



Joined: Aug 23, 2008
Posts: 977
Location: Scottish Borders
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G2 patch files: 2

PostPosted: Thu Nov 07, 2013 7:55 am    Post subject: Re: PCBs & Panels for a 6HP Cascadable 4ch DC Mixer
Subject description: taking orders until 29th of september
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fonik wrote:


BTW the sockets are the PJ301-B available from thonk/UK or earthenvar/USA, the potentiometers are 9mm.
the schematic is the common unity gain 2x inverting mixer scheme. simple straight forward. detailed documentation will follow soon.

the PCBs:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Cascadable DC Mixer 6HP (WIP) by fonitronik, on Flickr



Assuming this is the final BOM, are the pots 100K Lin or Log?

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diablojoy



Joined: Sep 07, 2008
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Location: melbourne australia
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PostPosted: Thu Nov 14, 2013 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Assuming this is the final BOM, are the pots 100K Lin or Log?

considering its a DC mixer i would assume linear
matthias boards received many thanks.
edit : oh by the way seems i am joining the euro party, found 4 sets of 84HP rack rails and enough end plate in some old salvaged gear ( a large data switch )
so i guess i will have to use them for a small euro set up. Laughing

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fonik



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

PostPosted: Fri Nov 15, 2013 2:00 am    Post subject: Reply with quote  Mark this post and the followings unread

the docs.
http://modular.fonik.de/pdf/CascadableDCMixer6HP.pdf

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cheers,
matthias
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