[hpsdr] Penny controlled switched voltage outputs for LPF usage

[g4fre at g4fre.com]

  If anyone else needs to solve the problem of how to provide switched
voltage outputs for lpf control from penny rather than the onboard open
collector outputs I just uploaded my method to my web  site
www.g4fre.com/hpsdr_high_side.pdf

  Dave

  ww2r
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