[NSRCA-discussion] NiMH Question

[Ed Alt]

I could be wrong, but I think they may have been using germanium diodes back then to get the lowest possible junction drop.  You've got to weigh the benefit of messing with all those solder joints, heating the cells etc against maybe just going with a redundant pack.  Plus you have to be pretty careful about routing the diode leads and bodies to avoid shorts and possibly having the thing wear against the insulating wrap on the cells.  You can get the weights right with smaller packs etc. and just do two to get your reliability up.

Ed

----- Original Message ----- 
  From: Bob Richards 
  To: NSRCA Mailing List 
  Sent: Friday, February 24, 2006 1:42 PM
  Subject: Re: [NSRCA-discussion] NiMH Question


  The diodes they used back then probably would not work as well in a modern system, since we have much more of a current drain with today's servos.

  I would suspect any good rectifier rated for the expected current would work.

  Bob R.


  Wayne Galligan <wgalligan at goodsonacura.com> wrote:
    What type of diode and would these be available from Radio Shack?

    WG

      ----- Original Message ----- 
      From: Bob Richards 
      To: NSRCA Mailing List 
      Sent: Friday, February 24, 2006 10:38 AM
      Subject: Re: [NSRCA-discussion] NiMH Question


      >>>NiCad's normally fail shorted and you have enough power to land. NiMh's normally fail open and you will need another airplane to go with your new battery.<<<

      Some of the old radios (Proline, for instance) had diodes across each cell in the airborne pack, in case a cell went open. Also, if a cell died (lost voltage) it would minimize the problem by preventing a cell from reverse charging.

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