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bjorwal 09/12/2021
Ball-bearings without any librication. Added some oil and noise almost disappered. The blower works from 4 to 14 volts, but connecting 2 blowers in series resulted in no function. The movement start has to be simultaniously. Equalising with a 10 ohm 4watt resistor and a 10uF capacitor over each blower did the trick to have 2 blowers working in series.
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