I would use a LM317 based powersupply and a potmeter to control the RPM.
But you can also implement the Manfred Huber design that you can find here:
http://www.teresaudio.com/manuals/schematic.gif
But you can also implement the Manfred Huber design that you can find here:
http://www.teresaudio.com/manuals/schematic.gif
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