General > General Technical Chat
3M Magnetic Tape Viewer
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Halcyon:


Easily the coolest thing I've seen for a while!
jonovid:
interesting to know this is possible. 

maybe make your own? with some type of mechanical pinch roller raster scanning with a modified floppy or hard disk drive read-write head may just give you
a higher resolution magnetic tape viewer, maybe using an arduino, only time will tell. at $100 their is got to be a good reason to give it a try.

I do not have the reason to give it a go for now!
mcovington:
The patent for it:  https://patentimages.storage.googleapis.com/ac/a9/79/f5a1d301063d87/US3013206.pdf
RoadRunner:
I wonder why pattern appears to be a digital even though all tapes he tested are analog.  Does it only shows peaks at certain level.
TimFox:

--- Quote from: RoadRunner on March 02, 2020, 08:50:05 am ---I wonder why pattern appears to be a digital even though all tapes he tested are analog.  Does it only shows peaks at certain level.

--- End quote ---
Magnetic tape is not linear.  Recording bias current swings the magnetic material from positive saturation to negative saturation at a supersonic frequency. The signal current shifts the ratio of positive to negative, giving a net magnetization that yields the audio signal after low-pass filtering in the playback head and amplifier.
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