h a l f b a k e r yWhy not imagine it in a way that works?
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What about the hole in the middle? |
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And the thickness - if it is more than a few mm thick, the turntable needle geometry will be all messed up. |
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And the auto-lifting mechanism that a lot of turntables have - there might not be much room for audio tracks if the card is not mahoosive. |
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// What about the hole in the middle? // |
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I have had thoughts about these things. The
components can be embedded in a thinner package
rather than being mounted on a surface, with tracks
between them. After a cursory search, I haven't been
able to find info on the thickness of a 78 disc, but
apparently iphones are 6.9 mm thick. Is it too much
to hope for some kind of convergence there? |
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Next to that the hole in the middle is not
problematic. |
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Getting the inertial balance worked out we'll leave as an
exercise for the students. |
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This could be done with a USB sound card/speaker made in a disc format. It would need to be no thicker than a micro-USB "A" connector. |
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Could a transistor junction be changed to sense a massive needle passing over head? |
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The grooves could supply a baseline pattern affecting the higher internal computation, depending on where it is in the track. |
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// Could a transistor junction be changed to sense a massive needle passing over head? // |
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A Hall-effect device could do that, but not a bipolar or unijunction transistor. |
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Some types of FET might just be able to sense a nearby conductive object. |
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That's unnecessarily simple. Obviously what's needed is a device with three little robotic arms that wiggle the needle on the record player. |
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