dstamand Posted April 9, 2008 Report Posted April 9, 2008 That's was fast !! My idea is to take a real 12" vinyl and WaterJet cut the holes all around it like your acetate. It could be weird.Nice. Quote
dstamand Posted April 9, 2008 Report Posted April 9, 2008 Btw, M-Audio Xponent works like that but with two sensor per wheel. Quote
Screaming_Rabbit Posted April 9, 2008 Report Posted April 9, 2008 but with two sensor per wheel.... to get the quadrature, you need two sensors. Either in one housing or separated.Greets, Roger Quote
Sasha Posted April 9, 2008 Report Posted April 9, 2008 Works Great ;DBq3QkT22ieU(crossfader not shown)Hey rasteri, that seams great. So, what is the final resolution at the end.. 360?What is the diameter of disc?How it feels compared to record or other digital scratch solutions?What do you think now about resolution? Will you try to go higher?What are the plans?Please wright some more details about it as you seams pretty competent to review it. Thank you.Also, I would really like if you Simone, or somebody else could bring that Spanish scratch project on light.@dstamandWhat is the resolution of that Maudio disc? Quote
dstamand Posted April 9, 2008 Report Posted April 9, 2008 @dstamandWhat is the resolution of that Maudio disc?175 Quote
dstamand Posted April 9, 2008 Report Posted April 9, 2008 ... to get the quadrature, you need two sensors. Either in one housing or separated.Greets, RogerEither in one housing or separated... ok i see now.I'm stupid. :( Quote
rasteri Posted April 9, 2008 Author Report Posted April 9, 2008 Hey rasteri, that seams great. So, what is the final resolution at the end.. 360?What is the diameter of disc?How it feels compared to record or other digital scratch solutions?What do you think now about resolution? Will you try to go higher?What are the plans?The disc is 16cm in diameter, just smaller than a 7" piece of vinyl, which I'll try mounting underneath it on a spindle. I'm going to stick the whole thing on something like a harddisk motor.It feels very responsive, on the same level as a CDJ-1000. I'm a pretty good turntablist and I would be happy scratching on it for hours. There's a few problems to work out though, for example the cue point keeps slipping, and the disc isn't big enough (for me).The resolution seems fine, in fact I'm thinking about lowering the resolution as the sensor keeps missing grooves. Or maybe it's because the slits in the pattern aren't the right size for the sensors. This is the first time I've ever made an optical encoder... Quote
rasteri Posted April 10, 2008 Author Report Posted April 10, 2008 I've fixed the drifting problems :) (and stuck a DVD on top to make it easier to grip)It really feels/sounds like scratching on a tiny piece of vinyl, I really didn't expect it to work this well.Here's a freestyle session I recorded earlier - http://www.youtube.com/watch?v=voVn0QNAyG0 - the crossfader is MIDI too btw. Quote
Sasha Posted April 11, 2008 Report Posted April 11, 2008 rasteri, I`m so blown away by your video!!! :D For non-turntablist like me this sounds and looks very, very useful. Bravo! I`m going to build one myself just for fun even I`m out of scratching. It takes alot of practice to learn to do it properly and you actually never stop learning but it is fun to fool around with it. ;DSo, what was cosing drifting?What do you think about bigger disc, and increasing the resolution?Would it cosed to feel less as the vinyl because of the different moving speed?Do you adjusting the sensitivity somehow? MTE did something like that on hs Traktorizer, and I`ve always thought it is a great idea if you can "tune" the response somehow. Quote
MTE Posted April 11, 2008 Report Posted April 11, 2008 http://de.youtube.com/watch?v=voVn0QNAyG0we all wanna see it ;) Quote
stryd_one Posted April 11, 2008 Report Posted April 11, 2008 Hells yeh.Hah I almost forgot to ask...how'd you fix the drift? Was it the spacing or timing or did you drop the res? (or was it something we didn't think of the other day?) Quote
rasteri Posted April 11, 2008 Author Report Posted April 11, 2008 The drifting was caused by the DJ program I was using (mixvibes), it seems to ignore very small movements. This was naturally causing the audio to go out of sync with the wheel. Switching to Traktor 3 fixed it. There are 250 grooves in the encoder wheel, so that gives 1000 points per turn (one per edge transition). I'm going to mount the whole thing on a spindle and use a real piece of 7" vinyl as the scratch surface, maybe I'll use a bigger encoder wheel.The difference in sensitivity from a real vinyl doesn't really matter, I mean if you're a turntablist you're used to scratching on different speed platters anyway (33/45). Quote
stryd_one Posted April 11, 2008 Report Posted April 11, 2008 LOL I just ass|u|me d you were looking at the midi data and not just trusting the app :) Quote
rasteri Posted April 11, 2008 Author Report Posted April 11, 2008 Here's the code if anyone's interested.main.cmain.c Quote
stryd_one Posted April 11, 2008 Report Posted April 11, 2008 Sick, thanks for sharing rasteri!This just needs a brief wiki page and I'll move this thread to the User Projects subforum. Quote
Sasha Posted April 11, 2008 Report Posted April 11, 2008 Here's the code if anyone's interested....it is not "if anyone interested", rather for all of you interested. ;DThank you very much. How about some software description for us non-programmers. What it exactly doing? Also could you post some more hardware details? Did you just connected IR opto and crossfader on free DIN AIN pins, or maybe directly to the core? Quote
rasteri Posted April 12, 2008 Author Report Posted April 12, 2008 http://www.midibox.org/dokuwiki/scratchcontrollerIt's mostly just waffle right now but I'll have schematics up as soon as I can. Quote
Sasha Posted April 12, 2008 Report Posted April 12, 2008 Rasteri, thank you for the wiki.I just started to look around for those faders you listed. vestax CF-CC crossfader looks cheapest of all and it still cost $129.00 :oWhat is the impedance of that fader and what is the cheapest crossfader that can be used for scratching? Quote
rasteri Posted April 12, 2008 Author Report Posted April 12, 2008 The Infinium is about $30. It's non-contact. I've never used one though.The CF-PCV which I used goes for about $80. Contact faders tend to be more expensive - and crappier.You could probably use any fader that was nice and loose, but it won't last long if you use it for scratching.Here's a quick schematic.schematic.PNG Quote
rasteri Posted May 5, 2008 Author Report Posted May 5, 2008 Hey just to let y'all know I'm still working on this. Latest plan is to have a slightly-bigger-than-12" encoder wheel glued to a real piece of 12" vinyl. The LED/photodiode would then be mounted on a real turntable. I decided I'm not really good enough at construction to do it any other way.It also has the advantage of being portable to any club with a turntable. It could be mounted in the 45RPM adapter hole, or the lid hinges, for easy installation/removal. Easier than wiring up Serato in the middle of the previous guy's set, anyway. Quote
rasteri Posted May 24, 2008 Author Report Posted May 24, 2008 Now got a aluminum foil capacitive sensor on the wheel so the song keeps playing if you let go.bNtCZN97R3II think that's basically all we need, now to start building it into something that isn't made of cardboard and duct tape. (When I get paid). Quote
Wild_Weasel Posted May 25, 2008 Report Posted May 25, 2008 Hi rasteri!That is absolutely amzing work!!I would be happy if you could add some photos to the wiki, shematics and so on.Great work again, keep it up!Kind regardsMichael Quote
nILS Posted May 26, 2008 Report Posted May 26, 2008 [me=nILS Podewski]is waiting for a complete step-by-step how-To on the WIKI[/me] Sweet! I want one ;D Quote
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