Reworking a low-end record player into a classy design.
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The player is based on a Jensen JTA-230 Stereo Turntable, a low-end player I didn't feel bad destroying. I started with a rough idea- a player with a floating platter on top a nice piece of scrap wood I had around. From there, I've been using the Jensen as a known-working template, modeling parts by part, using similar dimensions.
Parts are designed in Autodesk Fusion 360 and printed on an Ultimaker 2.
TODO:
I've designed and printed the arm, which is most complicated piece. If fits snaps into the raised arm nicely, rotates well, and fits the needle.
The clasp that holds in the needle is a little brittle and might not stand up to swapping out the needle. Something to consider updating in future revs.
The sounds off the turntable needle directly contains a lot of scratchy, high-frequency noise. The output is also too strong for the LM386 amplifier directly. After some tinkering with low-pass filters, I found some appropriate values get a good sound. I brought out the bass a little more than the original record player, and at this point I find the sound more pleasing than original amplifier.
I will publish the circuit schematic along with the PCB.
Zach
GPPK
Matt Reimer
Dan Maloney
ken.do
Seems like a neat project, I am interested in building one.
The link that you included for the full write up does not work (Server not found error), could you either post the files on this page or give a link that works?
Also could you post a schematic and PCB files? If you post a schematic, I can design the PCB and get it printed. If it works I can throw the Eagle files on the page to help out with the project.
Cheer - Baird