7
3. DIMENSIONS & WEIGHTS
Turntable mm (inch)
Width 452(17.80)
Depth 361(14.21)
Height(topoftonearm) 175(6.88)
Speed Control Unit
Width 150(5.90)
Depth 295(11.61)
Height 85(3.34)
Power Unit
Height 83(3.26)
Width 190(7.48)
Depth 243(9.56)
330(12.99)
Weight kg (Ib)
Turntable 18.73(41.29)
PowerUnit 4.04(8.90)
SpeedControlUnit 2.52(5.55)
Shipping 29.1(64.15)
4. DRIVE SYSTEM
The turntable is driven by a custom made bi-phase AC synchronous
motor.ThespeedcontrolunitusesadedicatedDSPenginetogenerate
two independent pure mathemacal sine waves which provide total
controloffrequency,phaserelaonshipandamplitude.Theseinturnare
matched (tuned)tothe motor foraccuracyto obtainthe bestpossible
performance. The output driver stage is a 2 channel, class AB Bi-polar
designwith low distoronandrelay coupled directlytothe motor. The
enredesignisimplementedusinghighqualitysurfacemounttechnology
onagoldplatedFR4PCB.
5. SPEED RANGE
Thespeedrangeis33
1
/
3
and45rpmwithindependentmemorysengsvia
a switched encoder.