Old Floppy Drive Becomes New Turntable 329
vinyl1 writes "This must be the ultimate in retro-cool hardware hacking. The floppy drive is obsolete, but the turntable is not, and that got one guy to thinking. He provides a full tutorial on how to turn that worthless old floppy drive into a most desirable piece of audio gear."
That would make one *terrible* turntable (Score:2, Informative)
Why not simply buy a decent used turntable from eBay? It isn't as if they are all that expensive.
Re:What about the stylus? (Score:5, Informative)
Re:That would make one *terrible* turntable (Score:5, Informative)
Re:What about the stylus? (Score:3, Informative)
If you didn't know, a stylus is *not* an integral part of a turntable. It's a component (replaceable or not) of a *cartridge*. They're sold separately, just like tonearms so no ripping up involved.
This project only aimed to build a turntable(plinth, platter, bearing + motor), and not a tonearm or cartridge. They would be much more complex to DIY.
Re:That would make one *terrible* turntable (Score:5, Informative)
Re:Before anyone asks... (Score:4, Informative)
Someday I'll ge tired of saying "if you RTFA"...
Re:That would make one *terrible* turntable (Score:1, Informative)
cool DIY project, but: (Score:5, Informative)
Direct drive. There's a reason why DD turntables cost more. Those pulleys wear out, they slip, they stretch on start up and oscillate as they balance out. Why bother with a brushless motor if you're slapping it to a rubber band? Why praise the electronic speed control features of the floppy motor when you're wiring it to a system that by design can't regulate it? Give me torque. When I press that "go" button, I want it spinning perfectly at 33, 45 or maybe 78 RPM, now, not a quarter turn from now. I'm sure there's a way to wire a floppy to do just that, so get back at it!
cf. The Hold Steady, "Everyone's a critic and most people are DJs"
Re:Wow and flutter (Score:2, Informative)
Re:That would make one *terrible* turntable (Score:1, Informative)
What's more, a good turntable will go to great lengths to isolate motor vibrations from the platter. The prototype in the article could do a *much* better job. It's clever, but I see little reason to make the effort given the number of high quality turntables available used at low cost.
Re:That would make one *terrible* turntable (Score:5, Informative)
Re:There is something beautiful about ... (Score:2, Informative)
I just had a quick google, and found this [kempa.com] - apparently during the 70's and 80's there were a few such vinyls. Possibly the one you're thinking of was 'New Anatomy' by Inner City Unit?
Another cool example (also mentioned on the site I linked just above) was on a record called XL-1 by Pete Shelley (of The Buzzcocks). If the program encoded in the last track was run while the music played - OH WOW images and lyrics in time with the music!
Mirrordot (Score:5, Informative)
Re:/.-d (Score:2, Informative)
Re:I've always wanted to do something like this (Score:2, Informative)
How long does it take for the magnets to "recover" from each motion?
Electric motors do not work by interlocked mechanical devices. They work entirely through the EM force field. They self "clutch." The function of a clutch is prevent interlocking mechanical devices from damage. Take an electric model car and set it to running at slow speed. Now grab a tire. The motor will stop turning. You will feel the torque generated by the EM field. Rotate the tire against the force. Now let go of the tire and it will start turning again. If the motor operates the wheel by direct drive there isn't even anything to break.
If the motor is attached to a mechanical drive by a belt slippage of the belt provides additional clutching action, but this is highly undesirable because such clutching takes time; and what you want, as you note, is instantaneous reaction of the platter to the forces in the motor.
Torque is king.
KFG
Re:cool DIY project, but: (Score:5, Informative)
If you're wanting an audiophile deck for just putting a record on and listening, then you probably don't want DD after all.
Shooting from the hip. Ouch. (Score:2, Informative)
Here's [smartdev.com] the history and some review. The story on the site hosting that is also interesting.
At any rate, it looks like the guy who produces that laser turntable does so with proper permission from the owner of the original patent.
Never mind the precise control... (Score:3, Informative)
The result will be very smooth, precisely controlled speed.
Re:That would make one *terrible* turntable (Score:4, Informative)
For these kinds of DIY projects, I've been enjoying hackaday [hackaday.com] and the print version of Make Magazine [makezine.com] (although I see they have a fair bit of stuff on the site now.) Being able to buy something doesn't invalidate the many reasons for doing it yourself, or in this case, the entertainment value of seeing that someone else did it.
If I had more time (and didn't live with my girlfriend) I'd probably do lots more of these kinds of things.
Err...not quite... (Score:1, Informative)
Re:That would make one *terrible* turntable (Score:4, Informative)
So you get that cartoony effect where the sound starts out all slowed down and gradually reaches the correct pitch.
If you tried to scratch one of these, it's go like:
Rock the - rrrrrRRRRROOOOOCK the - rrrrrRRRRROoooock the beat!
Direct drive turntables are used by DJs and musicians because you can physically stop the record, or scratch it or whatever, and when you let it go, it'll return to the correct speed almost immediately, so it's like:
Rock the - Rock - Rock the beat!
Direct drive is better, but significantly more expensive, which is why it's cool that you can make them out of something as crappy as a floppy drive.
Re:Site /.ed, but... WTF?! (Score:2, Informative)
Re:I've always wanted to do something like this (Score:5, Informative)
Has no vibration from the motor transmitted to the platter/tonearm.
Has stable speed (startup speed is unimportant)
Typically you'll see them use fairly low torque belt drive setups (the belt helps with both vibration and speed flutters).
DJs are interested in a turntable which:
Starts fast (thus has high torque)
Has variable speed (pitch)
Doesn't mind being stopped, reversed, etc (there's no "accidental" about it!)
These are typically direct drive units, where the platter actually forms part of the motor itself. For example, in the classic SL1210, the coils are in the base of the unit, and the magnets are mounted right onto the (free spinning) platter. There are no gears, cogs, belts or anything else to wear out. The things are virtually indestructable. It's also worth noting that most of the movement of a record under a DJs hand is facilitated not by the platter but the slipmat - the platter continues turning underneath. This is very beneficial to the startup time, as when you release the record friction grabs it and it's up to full speed right away.
Re:Thats wicked (Score:3, Informative)
Comment removed (Score:2, Informative)
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