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.
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.
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.
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.
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.
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.
You can try. Post the pictures of your disassembled fader (including the PCB and whatnot) so we can see what kind it is.
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.
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.
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.
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.
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.
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.
Thanks for your answers.
Well, let's see what will happen. If I get a contract now - I will earn money for other mixer. If not - will try to put VCA circuit inside. And, IMHO, there is no need to trace PCB - I have sound lines on the wire coming to xfader.
I found VCA circuit here
BTW, are you Mike Reezy? That guy said that he designed PCB that I've found in page that you gave me.
Well, let's see what will happen. If I get a contract now - I will earn money for other mixer. If not - will try to put VCA circuit inside. And, IMHO, there is no need to trace PCB - I have sound lines on the wire coming to xfader.
I found VCA circuit here
BTW, are you Mike Reezy? That guy said that he designed PCB that I've found in page that you gave me.
No, I'm not Mike Reezy. He was a member of the DigitalVertigo board who helped me by posting a drawing of the top of the Focus Fader PCB. The post is here. With that (and a picture of the back of the PCB from the old mod section of Asisphonics.net), I drew a schematic in Eagle and built a Focus Fader clone from it. Mike Reezy was mistaken as I designed the PCB and still even have the original Eagle files.
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