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This is just a quickie art project doobrey - absolutely no
utility.
There are postcards which can be played on record
players, embossed with a spiral groove on which one
places the stylus. There are also sound cards which have
the disadvantage of having blobs of solder on one side
and components
on the other. Take two blocks of
plastic, stamp a groove recording on each side and
encase a sound card in it, and you have a record which
can be used as a sound card/sound card which can be
used as a record. In fact you could even have the sound
card provide some kind of functionality to the record
player by bluetooth and stuff going on to process audio
inside it, but in general the idea is to have a sound card
which you can plug into a PC which you can also put on a
turntable and play.
That's it.
[link]
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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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