Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th February 2007, 11:20 PM   #1
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Default DIY Contactless Fader

I have Numark DM1050 mixer. Mostly, using it for battles. Xfader gets noisy after a short time. Want to make it optical or magnetic. I've found some info about guy named GNUZ. But couldn't find his circuit. Maybe someone have it here. If you have, please. let me know. It will be usefull for me. As well i have an idea to make magnetic fader using microcontroller. Now I'm trying to figure idea in the words. Will post it soon.
  Reply With Quote
Old 11th February 2007, 09:16 PM   #2
gnuZ is offline gnuZ  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: n/a
Here it is.

I still use it to this day, and it's just as loose and sharp (cut-wise) as it was when I first put it together.
  Reply With Quote
Old 12th February 2007, 07:05 AM   #3
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Can you send it to me by mail? Your link have a problem. I registered but still can't get access to it. My mail is slamlmd (doggy) yandex.ru.
  Reply With Quote
Old 12th February 2007, 07:31 PM   #4
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Finally I received that. UNBELIEVABLE WORK! That's really cool!
What do you think, can I put it in my Numark DM1050 mixer? I've disassembled my fader and I have photos of it. I don't know whether it's VCA or not.
  Reply With Quote
Old 13th February 2007, 06:31 AM   #5
gnuZ is offline gnuZ  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: n/a
You can try. Post the pictures of your disassembled fader (including the PCB and whatnot) so we can see what kind it is.
  Reply With Quote
Old 13th February 2007, 07:35 AM   #6
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Here is the photos of fader and mainboard of mixer.
http://dreams-are-real.com/soft/1.JPG
http://dreams-are-real.com/soft/2.JPG
http://dreams-are-real.com/soft/3.JPG
http://dreams-are-real.com/soft/4.JPG

And if you look carefully at photo 3 you will find that resistive surface is shaped. And that shape gives a cutting curve,

As well on PCB photos - switch is a Hamster switch, and other one is curve switch (linear, scratch). The chip just next to switches is AN6884 (peak indicators). Chips near the equalizers is NJM4558LD (preamps). Thank you for help.
  Reply With Quote
Old 15th February 2007, 05:05 AM   #7
gnuZ is offline gnuZ  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: n/a
At first I thought that this fader is analog due to it having 4 separate wipers but looking at the underside of the PCB it has the inputs connected, so I'm thinking that it's a VCA fader but with separate left and right control wipers. I could be wrong though. I guess the only way to know for sure is to trace the signal traces and/or use a multimeter to check if the fader attenuates a DC voltage.
  Reply With Quote
Old 15th February 2007, 09:57 AM   #8
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Alright, I will try tonight.
  Reply With Quote
Old 16th February 2007, 06:10 AM   #9
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
I'll tell you whole story. Firstly, when I touch xfader pins on other side with mixer on - I got hum, big hum in speakers. Then I tried to measure voltage on it. But my multimeter couldn't see any DC voltage. So maybe it's a sound, I didn't found it coz' my multimeter can measure AC only around 200V.
When I took xfader's metal plate away from contact with mixer's metal case - I got hum.

Seems analog? So what can I do to put your fader inside? There must be a way.
  Reply With Quote
Old 20th February 2007, 05:42 AM   #10
gnuZ is offline gnuZ  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: n/a
Sorry, but there's not much you can do besides buy a brand new VCA-based mixer. Trying to retrofit a VCA circuit into an analog mixer isn't impossible, but it requires that you trace the schematic from the PCB (which will take quite a bit of time if you're not experienced in it) and implement the VCA into whatever already exists. I'd just save up for a better mixer if I were you.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to ID volume & fader pots? jol50 Car Audio 54 18th January 2008 05:26 AM
Help using Simple PCV fader as a sound kutter (VCA?) Mike Reezy Analog Line Level 5 12th February 2007 06:43 AM
Pioneer Fader start kamskoma Everything Else 2 8th December 2006 09:11 PM
6-channel balance and fader Fragen Parts 0 23rd November 2004 02:25 PM
White led fader VoLCoM Parts 11 27th December 2003 09:52 PM


New To Site? Need Help?

All times are GMT. The time now is 10:45 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2