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Old 16th April 2004, 04:34 PM   #1
JimmyB is offline JimmyB  Scotland
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Default Turntable AC Motor Supplies

Hi there,

I've had a good forum search but haven't found any mention of a turntable power supply for an AC Synchronous motor as in the Rega P9 or the HEED AUDIO Orbit.....

Has anyone got a design for such an appliance? I'm quite interested in building one as an alternative to the usual DC option (which I also have at home).

Rega & Heed seem to regenerate the pure 50Hz (60Hz) signal so essentially a waveform generator....is this an easy one?

regards & confused,

Jimmy
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Old 16th April 2004, 07:14 PM   #2
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Quote:
Rega & Heed seem to regenerate the pure 50Hz (60Hz) signal so essentially a waveform generator....is this an easy one?
There has been a lot of discussion. Go on searching. Whether it's easy depends only on your abilities. Not as easy as a gainclone; not quite as difficult as a tube phono
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Old 16th April 2004, 08:40 PM   #3
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Jimmy, this is rather easy:

1 Generate 50 Hz sinus from a microcontroller with DAC output, PWM output or from 8 I/O pins (and make your own DAC with R-2R technology), use a wien bridge, use a CMOS oscillator with a LP-filter. You have many options for generating sinus signals.

2 Feed the signal into an power amp, 5-20 Watts, approx 10-15 VAC into a 230/12 transformer backwards.
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Old 16th April 2004, 09:02 PM   #4
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1 Generate 50 Hz sinus from a microcontroller with DAC output, PWM output or from 8 I/O pins (and make your own DAC with R-2R technology),
That's exactly what i've done. If the controller has enough ports you can even generate a second phase and discard the cap.
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Old 17th April 2004, 08:09 AM   #5
JimmyB is offline JimmyB  Scotland
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New it would probably be embarassing asking the question!!

Thanks for the help, since I work for a company which designs & produces DAC chips, that sounds like the way to go (cheap as chips ).

regards,

Jimmy
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