Re: Handyboard Expansion Sonar Issues jdunn@unm.edu wrote: >  > There is a very high probability that you plugged the foil cable in > backwards.  Doing so, even for a moment, will destroy the IC chips.  Please explain.  Now I'm worried about damaging my sonar board.  Since the foil cable has conductors on only one side, I didn't think that it was possible to plug it in "backwards" and still make an electrical  connection.   My understanding of the hookup is as follows: On the HB Expansion Board pin 1 (gnd) of the Polaroid connector is toward the top of the board.  On the Polaroid Ranging Module pin 1 is toward the left.  If the foil cable is connected so that the dotted edge of the cable is nearest the pin 1 end of each connector, I fail to see how there is any danger of damaging the sonar board. Thanks for your help.  - - -Nick - - -