| General > General Technical Chat |
| 3M Magnetic Tape Viewer |
| (1/2) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |