Today's Message Index:
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     1. 02:09 PM - Re: Failed brownout battery experiment (Eric M. Jones)
     2. 03:04 PM - Re: Failed brownout battery experiment (user9253)
 
 
 

Message 1


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Time: 
02:09:33 PM PST US
Subject: 
Re: Failed brownout battery experiment
From: 
"Eric M. Jones" <emjones@charter.net>
      
      
      
      > Since the Dynon normally is powered through a separate terminal, I believe that
      DS-1 can be eliminated and DS-3 can be shorted. Since this circuit will only
      be needed for less than a second during engine start, does R1 need to have such
      a high wattage rating? 
      > Joe
      
      
      Joe, I think DS1 and 3 are needed. Bob?
      Does R1 need to be 35W? This is a TO-220 resistor, so it's pretty small. When the
      circuit is first charged (or after sitting) the capacitor current is a dead
      short. So no, 35W is excessive, but it has to be high wattage. 1.4A x 1.4A x
      10 W. You might get by with a lot smaller part.
      
      Make sure you note that Bob N. pointed out that the Supercaps needed to be pulse
      rated, so I've changed them.
      
      --------
      Eric M. Jones
      www.PerihelionDesign.com
      113 Brentwood Drive
      Southbridge, MA 01550
      (508) 764-2072
      emjones(at)charter.net
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=407385#407385
      
      

Message 2


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Time: 
03:04:03 PM PST US
Subject: 
Re: Failed brownout battery experiment
From: 
"user9253" <fransew@gmail.com>
      
      
      Thanks Eric
      This circuit might have to be powered on when ever the D-180 is on (instead of
      through the start swtch) in order to give the capacitors time to charge.  According
      to an online time constant calculator, it could take up to 2.5 seconds.
      http://easycalculation.com/engineering/electrical/capacitor-energy-rc-time-constant.php
      
      --------
      Joe Gores
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=407391#407391
      
      








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