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 Forum index » DIY Hardware and Software » Circuit Bending
My Monotron Modification
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Wed Mar 06, 2013 1:56 pm    Post subject: My Monotron Modification
Subject description: Korg Monotron
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Hello !!

Just started to mod my Monotron so i can use it with my modular synth when its finished.
I use a 9 pin sub'd connector that fits just fine in the Monotron.
With a flat cable i connected the sub'd with the points i need.
(Pitch, Gate, Cutoff, VCO out, LFO out, VA, GND, Vbias)
One wire spare.
Some pictures of the result so far.

Now check some schematics and test on breadboard.

Grt,
Chris


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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Wed Mar 06, 2013 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

UPDATE !!!

Here is the schematic and pcb layout that i want to test.
VCO out and LFO out works fine. (through my mixer, mono)
Spare wire i want to use for audio out. (not on the schema)

Grt,
Chris


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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Thu Mar 07, 2013 11:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello !!

I finished the artwork for the aluminium front and is in eurorack format.
Two layouts i designed, one with the sub'd connector and one complete
with the Monotron. (no ribbon controller)

THESE ARE THE RAW VERSIONS !!

When i have all the parts, a final check.

Grt.
Chris


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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Sun Mar 10, 2013 8:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Today i finished the front panels.
Art layouts are ok, sub'd connector a little bit higher so it fits better in the eurorack.
My second Monotron arrived for the other front panel.
The ribbon controller i will use later.
Here some pictures.

Grt,
Chris


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Cynosure



Joined: Dec 11, 2010
Posts: 623
Location: Toronto, Ontario - Canada
Audio files: 34

PostPosted: Sun Mar 10, 2013 8:46 am    Post subject: Reply with quote  Mark this post and the followings unread

The panels look great. Nice work Smile

Do we get to hear a sound demo after they are both complete?
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Mon Mar 11, 2013 7:05 am    Post subject: Reply with quote  Mark this post and the followings unread

How did you make that good looking panel?
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Mon Mar 11, 2013 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

For my eurorack front plates i always use anodized aluminum.
The artwork on the panel is done with "waterslide decal paper", you can get it for laser and inktjet printers.
After that i spray a thin layer of vernish to finish it.

Grt.
Chris
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Wed Mar 13, 2013 2:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here some pictures of the second panel with pcb from the Monotron, pots and jacks.

Grt,
Chris


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bunker



Joined: Mar 19, 2009
Posts: 57
Location: Manchester, UK

PostPosted: Tue Apr 16, 2013 4:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow! Looks amazing! A couple of questions if I may... What is the function of VA? I checked the schematics and it doesnt seem to be Vbias? I can see from your schematic that you're applying 3v via a voltage reg. Is that voltage normally derived on the main board? What are you bringing it out for? Keep up the good work!!
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Bloxelectric



Joined: Sep 23, 2013
Posts: 1
Location: U.K

PostPosted: Mon Sep 23, 2013 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just found this thread & at the time i am contemplating modding a monotribe or two.
Great work here, really organized looking. I'm an electrical novice but even i can make some sense of your work here. Thanks for all the effort posting here & i would be interested to know how the project is fairing up under the duress of use . Wink Nice one indeed.
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Infrablue



Joined: Dec 29, 2011
Posts: 122
Location: Utah

PostPosted: Mon Sep 30, 2013 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

This is GREAT work!
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5c4r7



Joined: Nov 12, 2013
Posts: 1
Location: Toronto

PostPosted: Tue Nov 12, 2013 7:51 pm    Post subject: Faceplate? Reply with quote  Mark this post and the followings unread

Hi There! First off, amazing work! I have to ask, where did you get your faceplate cut and how much did it cost? I sent your design to a company here in Toronto and they wanted $260 to make one for me. I think your mod is awesome and I would really like to make one for myself but, keeping costs down is somewhat imperative for me at the moment. Thanks and keep up the great work!
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new voodoo



Joined: May 06, 2013
Posts: 90
Location: RVA USA

PostPosted: Thu Nov 14, 2013 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am SO doing this. Like THIS WEEKEND..well, probably mid-week next week actually (have 37 other devices in the pipeline but I keep about 4 in circulation being made at same time)
PSYCHED!!
Ive kinda been waiting for a reason to use etchant & copper clads, etc Ive got all the stuff and just havent gtten to it yet. AND i have the monotron for it cause I bught one on a whim and its just been sitting aruond in the living room and to be honest-im tired of hearing "WHeeeUUUmmmmWHEEEEuuuOOOmmmp" whenever a friend decides to pick it up.
Since im in the middle of building a modular and need about 10u more of modules (want to end up filling a 100u case), its perfect!!
fantastic.
Cant say enough good about this.
so cool.
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