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I looked at that page and appreciate that link.  I might try it out with the used 959 I just got.  I noticed that the bias voltage for the driver on that sheet said to set it to 5.80v. 

???

IIRC, the MAX voltage for the IRF-520 is supposed to be 4.5v.


Not a big deal, really.  Just wondering why.  A typo; or am I working from bad info?