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3. Specification (Turntable)
The turntable is driven by a 3-phase, 6 pulse, inductance motor, with 8 pole Neodymium
magnets and 3 integrated Hall position sensors.
The electronic controller uses a high performance microcomputer, optimised for motor
control. The Hall position sensors on the motor provide accurate feedback to the micro
controller allowing very accurate and stable speed control, including 33 1/3, 45 and 78
rpm. The reference oscillator is a 10MHz quartz crystal, which is multiplied by 4 to
produce an internal microprocessor clock speed of 40MHz.
The driver stage has CMOS buffers/MOSFET drivers with 1.2 Amp peak drive capability.
The power output stage is six high power complimentary Mosfets in a 3 Phase Bridge
Driver configuration.
Closed loop speed control is implemented using a pseudo sine wave commutation
sequence and a proportional-plus-integral (PI) algorithm.
The design incorporates a 4 layer surface mount technology pcb with on-board user
adjustable speed variation control.
Speeds 33 1/3, 45 & 78 rpm
3.1 Dimensions (Turntable)
Width 370.0mm (14.57")
Depth 350.0mm (13.80")
Height 178.0mm (7.0") – To top of Arm
Platter Diameter 304.0mm (11.97")
Spindle to Arm 215.35mm (8.48")
Net Weight 16.0Kg (35lb)
Shipping Weight 18.25Kg (40lb)
3.2 Dimensions (Power Supply)
Width 170mm (6.75")
Depth 305mm (12.0")
Height 68mm (2.65")
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