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Old 05-09-2012, 12:01 AM   #18 (permalink)
OneSelfLost
Automagus Fiendus
 
Join Date: Aug 2010

I agree with Ando. The noise would be feedback from the motor brushes. Batteries don't supply a noisy voltage. Regulator circuits usually have caps on the input and output because they are regulating a rectified AC voltage. The caps filter out the ripple effect.
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