*Build Log* DIY 4 Chennel MIDI Mixer from scratch

**eataskdotcom** · 08-26-2010, 09:49 PM

After much research I finally ordered the first of my parts for my DIY midi mixer. Here is my parts list so far

DJ Tech tools $61.18
19x DJTT Green Knobs
4x DJTT Green Fader Caps
5x Purple Arcade Buttons

Mouser $47.97
3x 10K ohm Potentiometer
12x Toggle Switch
4x 10K ohm 75mm Slide Potentiometer

Radio Shack
8x LEDs with Panel Mount

Livid
1x Brain
2x 10 Pin Ribbon
1x 16 Pin Ribbon
1x 14 Pin Ribbon

EDIT:
Mouser $17.12 + Shipping
16x Center Detent Potentiometers

All Electronics (THESE DID NOT FIT

) $21.61
16x Center Detent Potentiometers

Its to bad the original website does not have a data sheet for the part, so i am not sure what type of shaft it had (i.e flattened D or serrated etc). From the picture it looks like its flat and plain so I will probably have to file down a side to make it into a flattened D so i can put the Dj tech tools knobs on them with out them slipping everywhere.

I though instead of buttons it would be cool to control filter on and off and PFL on and off with switches like these to give it a kind of home brew look. I would have a dedicated filter section on the top, for each channel, then the eqs then switches for PFL then the faders. And at the bottom to top it all off 5 arcade buttons just for fun. And on the side i will have 3 Knobs for master volume PFL volume and mix/PFL along with a few switches for shift functions. I decided not to put a cross faded because I never used one when I had an analog 4 channel mixer. Also was going to put on encoders for the gains but since this is going to sit in between my xone 1d and 2d I figured i would just use the encoders on them.

I hope to keep my progress posted and hopefully it this will prove helpful for others trying to do the same thing.

**photojojo** · 08-26-2010, 10:05 PM

Interested in watching this.

**theory28** · 08-26-2010, 10:31 PM

dont you need 5 fader caps, not 4? 4 for each line, and then 1 for the cross :S

sounds interesting!!!

**eataskdotcom** · 08-26-2010, 11:16 PM

Originally Posted by theory28

dont you need 5 fader caps, not 4? 4 for each line, and then 1 for the cross :S

sounds interesting!!!

As stated in the bottom of my post i'm not going to have a cross fader, but thanks for the concern

**eataskdotcom** · 08-27-2010, 12:13 AM

So I finally found some good panel mounted, center detent potentiometers, I will be posting the link to them in the OP.

**eataskdotcom** · 08-30-2010, 05:35 PM

Look what i got in the mail today! Unfortunately the knobs do not fit on my potentiometer, i neglected to notice that a 1/4" shaft is actually 6.35mm instead of needed 6mm *sigh* I found a website selling RK09L1220 Rotary pot. 10KBx2CC which is an alps 10K ohm linear duel potentiometer with center indent and flattened D shaft.

http://www.familygate24.com/alps/potentiometer/price/

I had to email them to get a quote on how much it would be. Shipped to the US it would be 39,48 EUR which is about $50. :\ this is quite a bit more then i wanted to spend, but i guess going the cheaper rout got me a bunch of potentiometers i cant use.