Analog audio recorded on a floppy

floppy_audio

[Jeri ellsworth] of fatmanandcircuitgirl.com has made an audio recorder out of a floppy disk and an old tape recorder. She’s able to record 15 seconds of audio directly to floppy disk. In the video after the break, she explains how it works, and why you hear the creepy reverb effect. The next step is to run this as a pedal effect for stage music, and she even mentions doing a larger hard drive version with the ability to seek tracks.

31 thoughts on “Analog audio recorded on a floppy

  1. I did this before only there was no modification needed to the drive. My idea was to make a sample mixing device but gave up because of the small sample sizes

  2. they stole my idea! i actually built a prototype of this exact project, but i guess they win because they made a video first. :(

    I used an arduino to drive the floppy motor and also used the guts of a tape player for the record and play just like this project. its freaking hard to solder to those flexible tape traces.

  3. I did this in the late 80’s on an Apple IIe computer and a 5 1/4 floppy drive. I think I got maybe 30-60 seconds of music to play from the pc speaker. The song was Motley Crue’s Shout at the Devil. At the time it was pretty awesome; everything was just beeps and tones from PCs back then…

  4. Those rev3 vids are so overdoing the commercials it’s unwatchable, ad, slow-to-the-point talk with overlaid ad, more ads, yeah thanks but no thanks.

  5. I had this idea long ago, only for video usage. I figured that if I made a write/pickup coil with a sewing needle wrapped with wire, it would work. But, back in ’95, floppy drives were expensive and off-the-shelf op-amps were a bit too noisy. I gave up after the parts list exceeded my budget of $20 (college student).

    Nice work. I wish I could have stuck with it way back when.

  6. i had a similar idea a few weeks back, but mine involves using a UV LED to “write” the data onto a piece of spinning ZnS:Mg GITD material, and an infrared LED to stimulate light emission for reading.

    the basic idea is that the signal degrades logarithmically depending on time since illumination, but upon IR irradiation it “releases” all of its stored energy in one burst.

    This would probably be capable of storing video (just barely) and if you set it up to do a repeating read/write/erase cycle it would store the video for quite a long time.

    :)
    -A

  7. I wonder if you slowed the disk speed you would get more record time. Also it would be cool to do this with an old hard disk. Multiple tracks on multiple platters!

  8. Back in the day we used an audio track on a special disk so we could align the heads on 5-1/2 and 3-1/4 inch disks for commodire systems

  9. @tom
    way ahead of you
    the problem that I’m running into is the crappy cheep head positioning system Iomega used. it is spring loaded so you have to pwm the coils constantly. will be very tough to get the turn table scratching fun too

  10. Some old telephone time services also worked with analog magnetic platters. The announcement was assembled by movable reading heads that selected the appropriate speech fragments from different tracks.

    1. The device depicted in this page (audioexmachina.wordpress.com/about/) does record on disk as well. Early units where produced on 1957, this one is a 1963. However, being a delay-unit for special effects, it continuously erases and re-records at each turn of the disk (370ms recording time for stock units, this one is modified for longer delays). BTW: I like floppy drive trick shown in the video.

  11. I had this idea years ago(like 20+) but I abandoned it when I realized that VCR’s had a better chance of doing what I wanted(multi-track recording at higher quality; for the record a VCR records audio FAR better than any 4 track recorder of the day). Then 2 years after I had my plans drawn up, Alesis released a multi-track recorder that used….VCR tapes. I don’t blame them, mind you, it just shows I was on the right path and they saw it as well.

    Kudos on making my old weekend project a reality though!!

  12. I did something like this back in the late 80’s. I used a 5-1/4 drive. Back then, the drive motors were motor/generator combos, and it was very easy to hack the speed controller (usually on its own PC board) to make the thing run at whatever speed you wanted.

    I cut extra windows on the floppy so that I could have multiple heads working the disk at the same time. Depending upon which heads were hooked up and what the rotational speed of the disk was, you could get some pretty interesting echo/chorus sounds. Fidelity was poor, however. I think that was largely due to the shape of the hysteresis curve associated with magnetic materials designed for digital data storage.

    Speaking of floppy drive motors- I installed one in a modified cassette deck and hacked the servo PCB, which allowed the transport to run at single/double speed, depending upon how an external switch was set. In combination with an outboard DBX unit, the sound quality was incredible, and it allowed me to do effortless ping-ponging with the Yamaha 4-track recorder I had at the time. I would record 4 tracks worth of music (drums, bass, and two guitars) and mix it down to the modified recorder. Then, I’d pop the tape out of the modified deck, reinsert it in the Yamaha, and have two open tracks left for vocals. Very clean, let me tell you.

  13. dammit! i designed the same thing, i haven’t built it yet. kinda gay to see somebody else already did it and made a video.

    i guess i’ll still do it. my design drops the voltage to the floppy disk motor though, so a lot more than 15 seconds can be recorded. it will affect the audio quality some.

    floppy drives spin at 300 or 360 RPM, but if you drop it to 25 RPM you can get a good 3 minutes on a floppy. enough for a short song.

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