The SinCos power supply for turntable synchronous motors is available now in our shop. It upgrades your old turntable to with an quartz-stabilized power and has many features that improve the audio quality of your turntable.
If you do not want to flash the microcontroller by yourself, there are also programmed microcontrollers available.
Note: This power supply supports only low-voltage synchronous motors. If your turntable is direct driven or uses a DC motor, you cannot use this circuit.