4 thoughts on “MagicQuartz – Early Preview Video

  1. Vasilis Kafantaris

    hello friend,

    I am writing to you from Greece. In my own is an Acoustic Solid Royal turntable and propably I need a speed control for the motor. Is a 24V AC motor and it runs at 375 RPM. Does your magic quartz regulate the RPM of this motor? If yes, could you please inform me for the current price and how do I get from you?

    thanks in advance for your reply

    regards

    Vasilis

    1. sebmate Post author

      Hi Vasilis,

      thanks for your interest! In fact, MagicQuartz should work with your motor. With some modifications it should also work directly from its internal 24 Volts (i.e. without stepping this up to 220V and then stepping it down again).

      The MagicQuartz will be available as a DIY kit as soon as it is finished (hopefully soon). Unfortunaltely there will be no prebuilt units. I will try to keep the price low to make it attractive for DIYers – hopefully below 100€.

      Note that I have no experience yet with this type of turntable (i.e. those with extremely heavy platters, low voltage) and I would be very cautious not to damage such an expensive unit. MagicQuartz is designed for older “consumer grade” (but nevertheless high-quality) decks from the 60ies and 70ies.

      Also note that the speed is picked up at the turntable’s platter, and you model seems to have a very reflective one. This may not work.

      Cheers, and greetings from Erlangen in Germany
      Sebastian

      1. Vasilis Kafantaris

        Hi Sebastin,

        Thanks for your prompt reply.
        The platter indeed is heavy as it weights 16 kilos. This platter rotating by inertia so the motor just keeps the accuracy speed. In fact I added a flywheel to the turntable and now the speed needs regulation. I found your solution very attractive and cheep. The manufacture has a solution but it is very, very expensive. I will stay contact with you until the final product will publish. I think that sould work.
        If it is possible I can sent you a photo from my motor with the technical infos noted on it.

        regards

        Vasilis

        1. sebmate Post author

          Hi Vasilis,

          it might work with your turntable, but I would be VERY careful not to damage it. You need to have very good knowledge in electronics. Also note that I do take any responsibility if this damages your turntable.

          It might work if you remove the step-up transformer to drive your turntable directly from the internal 24V (or use 30V to compensate for the voltage loss due to the sine wave conversion). If you do this, it might be necessary to filter the output voltage. Otherwise, the 31kHz PWM is fed into your turntable’s motor (in the normal MagicQuartz, this is done by the transformer and a capacitor).

          I would love to see MagicQuartz driving such a “beast” turntable. I’m almost certain that MagicQuartz is better than the solution from your turntable manufacturer, software-wise. But be careful, as mentioned above … Please feel free to send me your pictures at sebastian (at) mate (minus) labs (dot) de.

          Sebastian

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