Morning gang!
To recap - I got a £30 vinyl record player ( https://amzn.to/30ujDph ) so I could disassemble and upgrade.
It is USB powered, and sends audio via USB and phono.
OK? Here we go!
Thread 1/N?

This is it. Surprisingly weighty. Absolutely no frills. Can only play 33rpms (no 45rpm switch).
It runs about 4% fast, but the sound is pretty good!

Here's Sgt Pepper - from a 1967 mono pressing.
That's a lot better than I was expecting from a cheap player.
Obviously, vinyl isn't as good as MP3 - but they were simpler times.

This is the stereo panning on Here Comes The Sun.
Stick on a pair of headphones for the best effect.
I couldn't find a way to use ffmpeg to visualise the stereo separation.

Flip it over and remove the little rubber feet.
The grille is for cooling, I guess? Or maybe a different model has a speaker?
The other hole is the motor speed control (more on that later).

And these are the guts!
On the left, a thin switch which opens when the needle arm is sent back.
A motor at the bottom, belt driving the turntable,
And a *teeny* circuit board.
Wanna take a close up? Course you do!

Here's how the needle / cartridge is wired in. I was kinda hoping it would be socketed as I hate soldering / desoldering.
Might see if it's easier to put on a brand new arm? Or just cut and splice the wires.
Only has a common ground. No idea if that's normal?

Here's the board in all its glory.
Roughly the same size as a Pi - but there's lots of space inside.
Uses a H12000M crystal (I think).
The VR151 in the centre controls the speed of the motor.
Keywords: k-2217 280-002217-101-10

The main brains of the operation is this microchip.
JYK 2011C 123D1N942. I think.
I can't find anything about it. Any ideas?
JYK seem to be the OEM who make all sorts of record players.

The motor is *also* JYK branded.
It says it is capable of 3 different speeds. 1130, 1520, 2360 RPM.
Other models of this player have a 33/45 switch.
The ratio 1130:1520 is roughly the same as 33.3:45
I assume 2360 is for 78RPM records?
Keywords: EG-53SD-3F

I've no idea if I can drive that motor using PWM from a Pi.
Or if the variable resistor means I'll have to build a small circuit.
I *think* my first thing to try is getting analogue audio in directly from the needle - bypassing the pre-amp.
All suggestions welcome!

Hmm... After a day of playing, I think what I'm trying to do is impossible without buying more components.
So, flipping the project. Going to take the vinyl audio over USB and perform some realtime filtering. Then perhaps stream it over Bluetooth?

I've more vinyl questions for you lovely people.

How do you calibrate a record player's speed?
I have a dial I can turn to control the motor, but how do I know if it's exactly 33⅓ RPM?

I'm tone deaf and can't hear subtle changes in pitch.