Dotcom Q112 mixer extra inputs (Q113) 8 Channels 1u! DIY

Moog, Synthesizers.com, MOTM, Modcan, Moon and others..... Go big!

Moderators: lisa, luketeaford, Kent, Joe.

User avatar
voicetospirit
Wiggling with Experience
Posts: 332
Joined: Mon Aug 09, 2010 11:58 pm
Location: Eugene

Dotcom Q112 mixer extra inputs (Q113) 8 Channels 1u! DIY

Post by voicetospirit » Fri May 20, 2011 3:51 pm

Image
Image

Being in a do it yourself mood, I decided to take on another project I’ve been toying around with. Also, since I know had extra panels from last project, I couldn’t resist. I started out with the Q116 Ring Modulator panel, measured up some new holes and drilled them out. Rogers silk screening didn’t want to come off with nail polish remover and I had some extra holes from the Q116 left over. So I covered the panel in blue painters masking tape and spray painted it black. I then cut the holes out with an x-acto knife. When i bolted in the pots and jacks some of the tape wrinkled, but for a prototype its beautiful. The Q112 pcb board is the same as the Q113, after troubleshooting a bad TL074 IC chip, I added the extra potentiometers and jacks. Works great and saves space!

I also liked the photo shoot form the last D.I.Y. So I took the pictures in the same spot.
-Mackenzie
Web Site : VoiceToSpiritMusic.com
Blog : Voice To Spirit Blog

User avatar
Christopher Winkels
Lord of Tweed Manor
Posts: 4519
Joined: Sun May 03, 2009 6:53 pm
Location: Milky Way

Post by Christopher Winkels » Fri May 20, 2011 4:40 pm

Nice work.

I sort of wish Dotcom would have done the 8-channel unit like this to begin with.

User avatar
dude
fuck yeah!
Posts: 9990
Joined: Sun Jul 05, 2009 2:08 pm
Location: northeastohio

Post by dude » Fri May 20, 2011 4:42 pm

this one is 5 out of 5 and your photos get me hot.

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Sat May 21, 2011 9:45 am

I upgrade both of my 4-channel mixers (Osc Aid and Q112) into 8 channel mixers. Now I have one for CV and one for audio (or however I want to hook them up of course). Mine are each 2MU, yours are nice and compact! :yay:
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

JohnLRice

Post by JohnLRice » Sat May 21, 2011 12:53 pm

Nice job! But why the out of order numbering scheme? :hmm:

User avatar
voicetospirit
Wiggling with Experience
Posts: 332
Joined: Mon Aug 09, 2010 11:58 pm
Location: Eugene

Post by voicetospirit » Sat May 21, 2011 12:54 pm

Bryan B wrote:I upgrade both of my 4-channel mixers (Osc Aid and Q112) into 8 channel mixers. Now I have one for CV and one for audio (or however I want to hook them up of course). Mine are each 2MU, yours are nice and compact! :yay:
Lets see a picture.

It may get a little tight at times, but I am trying to max the bang per U in
my 32u system. At some point it would be nice to silk screen a panel...
-Mackenzie
Web Site : VoiceToSpiritMusic.com
Blog : Voice To Spirit Blog

User avatar
Henfield
Better Chemistry through Sound
Posts: 1240
Joined: Thu Feb 12, 2009 12:20 am
Location: Detroit, MI

Post by Henfield » Sat May 21, 2011 1:04 pm

JohnLRice wrote:Nice job! But why the out of order numbering scheme? :hmm:
Probably because the Dotcom Mixers do not have an input level for Input 4 and Input 8.

JohnLRice

Post by JohnLRice » Sat May 21, 2011 1:07 pm

Henfield wrote:
JohnLRice wrote:Nice job! But why the out of order numbering scheme? :hmm:
Probably because the Dotcom Mixers do not have an input level for Input 4 and Input 8.
Aaahh, k, that makes sense! :oops:

User avatar
voicetospirit
Wiggling with Experience
Posts: 332
Joined: Mon Aug 09, 2010 11:58 pm
Location: Eugene

Post by voicetospirit » Sat May 21, 2011 2:20 pm

Henfield wrote:
JohnLRice wrote:Nice job! But why the out of order numbering scheme? :hmm:
Probably because the Dotcom Mixers do not have an input level for Input 4 and Input 8.
Nailed it.
-Mackenzie
Web Site : VoiceToSpiritMusic.com
Blog : Voice To Spirit Blog

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Sat May 21, 2011 4:08 pm

voicetospirit wrote:Lets see a picture.
I would love to, but I am sworn to secrecy (probably because it looks exactly like a Dotcom 8-channel mixer).
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Thu Jun 14, 2012 1:39 pm

Cool beans! Anyone else done this mod (that they are willing to admit to, that is?) :tu:
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Thu Jun 14, 2012 3:01 pm

It is an easy mod, just add jacks and attenuators (the PCB is an 8-channel mixer). I added up the cost of parts/labor and it about equals buying the 8 channel mixer from Dotcom. If you are handy you might as well put in some sweat to make things better.

It is also worth noting that the Oscillator and Filter mixers are all the same PCB as well.
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Thu Jun 14, 2012 3:26 pm

Cool! I am heading over to RS Electronics tomorrow (Detroit-area supplier) for some other stuff and will pick up some attenuators as well. :tu:
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Thu Jun 14, 2012 3:44 pm

You will want some 2-pin and 3-pin MTA headers as well (.1 spacing).
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Thu Jun 14, 2012 3:45 pm

Bryan B wrote:You will want some 2-pin and 3-pin MTA headers as well (.1 spacing).
Will you adopt me? ;)
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Thu Jun 14, 2012 3:57 pm

Hahah, sure. Driving to Detroit is 10-12 hours for me, so not sure how much you will see me.

Keep asking questions, this place has answers.
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Thu Jun 14, 2012 5:28 pm

Bryan B wrote:Hahah, sure. Driving to Detroit is 10-12 hours for me, so not sure how much you will see me.

Keep asking questions, this place has answers.
No private jet for your adopted son. huh. ;)
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Sat Jun 16, 2012 7:05 am

OK, being serious now--what is the resistance rating for these pots/attenuators? Asking another way, what is pots can I order?
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Sat Jun 16, 2012 4:26 pm

You will want 100K, your choice for Audio or CV. I think the standard Dotcom pots are linear (not audio taper).
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Sun Jun 17, 2012 5:36 am

Thanks. BTW: On the dotcom website under parts, he lists a QP-P26 Pot, 1M - any idea which module uses this pot? Just curious.
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Henfield
Better Chemistry through Sound
Posts: 1240
Joined: Thu Feb 12, 2009 12:20 am
Location: Detroit, MI

Post by Henfield » Sun Jun 17, 2012 9:38 am

forceman wrote:Thanks. BTW: On the dotcom website under parts, he lists a QP-P26 Pot, 1M - any idea which module uses this pot? Just curious.
I believe that they are used for the Q109 Envelope Generator. I do not know what other uses they may have.

User avatar
Bryan B
Super Deluxe Wiggler
Posts: 1377
Joined: Wed Sep 23, 2009 6:09 pm
Location: Minneapolis, MN

Post by Bryan B » Sun Jun 17, 2012 12:17 pm

I haven't seen a 1M pot on any Dotcom modules that I have looked at, the search begins hahah.
doctorvague wrote:I like hiding out at Muff's. Let's build a fort out of some chair cushions and a blanket.
JP wrote:Hell I want to be able to turn my toaster on with a CV trigger.

User avatar
forceman
Learning to Wiggle
Posts: 49
Joined: Mon Apr 30, 2012 12:41 pm

Post by forceman » Sun Jun 17, 2012 4:37 pm

The search is on! Pity the fool..err...module..that has this 1M pot! ;)
Steve Force -- Detroit, Michigan

-----------> My links <--------------
My IT professional site
My musical gear Blog

User avatar
Henfield
Better Chemistry through Sound
Posts: 1240
Joined: Thu Feb 12, 2009 12:20 am
Location: Detroit, MI

Post by Henfield » Sun Jun 17, 2012 4:51 pm

forceman wrote:The search is on! Pity the fool..err...module..that has this 1M pot! ;)
Check out the last page of the Q109 data sheet: http://www.synthesizers.com/datasheets/q109adata.pdf. The PCB legend shows three 1M pots.

User avatar
megaohm
Super Deluxe Wiggler
Posts: 1897
Joined: Mon Jun 15, 2009 6:11 am
Location: Chicago, IL

Post by megaohm » Sun Jun 17, 2012 9:18 pm

Henfield wrote:
forceman wrote:The search is on! Pity the fool..err...module..that has this 1M pot! ;)
Check out the last page of the Q109 data sheet: http://www.synthesizers.com/datasheets/q109adata.pdf. The PCB legend shows three 1M pots.
The Q109 uses 1M audio taper for Attack, decay, and release.
The slew limit module might use one, too.
www.MegaOhmAudio.com

Will work for pistachios

Post Reply

Return to “5U Format Modules”