HP97 The journey begins
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11-01-2021, 05:35 PM
Post: #478
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RE: HP97 The journey begins
Hi all,
There appears to be an overseas mail delay problem so I still haven't seen the new 97 board yet. While I'm waiting I have been fiddling with the card read/write. I managed circuitry to mimic the write signals and an adjustable speed motor controller, so lately I've been looking into the reading. This is more complex as the signals are quite small from the magnetic head and are easy to get lost in noise. As I mentioned, I'm no analog wizz but I've managed to get the read signals direct from a card. The time bases are different but the attached image shows the original AC signal (upper) from a 67 and the one I captured in the mock up circuit (lower). Mine is looking correct and has reasonable amplitude but it has more noise superimposed which is understandable as it is just a breadboard circuit. Still some more head scratching to go as post processing this signal might give spurious data points. Still, it is encouraging. cheers Tony |
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