• Item: Turntable Speed Controller  
  • Type: AC 24V output - Frequency and Voltage Regeneration  
  • Posted: 25 September 2015  
  • Builder: YNWaN  
  • Country: United Kingdom  
  • Comments: 2  


This design consists of an amplifier that generates the 24V output required for the turntable motor. It is designed to work with an AC motor. The USB connection on the back panel allows the unit to be connected to a computer where the frequency and voltage of the two speeds can be independently selected. It is also possible to slow start the motor to reduce belt slip and to have the buttons illuminate in a number of different configurations. In addition, there is a counter to help assist with the assessment of stylus use. The angle of phase can be adjusted in very small steps to minimise motor vibration

Reasonably generous heat sinking is required as the amplifier circuit runs quite warm. The output socket is a locking Jaeger connector. The input is a via fused and switched IEC socket. The front and rear panels are laser etched (by myself) – the front panel is anodised aluminium. Most of this design is custom (I did not design the circuit). The front speed selector buttons illuminate green (they flash momentarily when the unit is powered up).


  • leopard
  • 6 October 2015 at 11:18AM
  • Very very nice done! I do also think this is a commercial product. Aint it?
  • YNWaN
  • 7 October 2015 at 12:36PM
  • No, it isn't a commercial product. This is the only one I've built and it is for my own use - I'm not intending to make any more.

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