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Re: [Healeys] Fuel gauge damper's super capacitor

To: healeys@autox.team.net
Subject: Re: [Healeys] Fuel gauge damper's super capacitor
From: Kees Oudesluijs <coudesluijs@chello.nl>
Date: Thu, 15 Nov 2018 11:51:39 +0100
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <002a01d47ccb$067c9420$1375bc60$@alexarevel.plus.com>
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A large capacitor will slow down the build-up of the voltage, so the 
needle of the fuel gauge (which is a Voltmeter essentially) will 
fluctuate less. It works exactly the same as an air filled expansion 
vessel in a water mains to prevent knocking in the pipes due to sudden 
pressure build caused by a water shut of valve in e.g. washing machines, 
however the water is replaced by electrons

What worries me is the 5,5V which seems rather low in a 12-15V 
electrical system, but I am not an electronic man. I do not know what 
the maximum Voltage on the gauge is, but if it is more than 5,5V I 
imagine the capacitor could fail?

Kees Oudesluijs



Op 15-11-2018 om 11:07 schreef simon.lachlan@alexarevel.plus.com:
>
> Hi,
>
> Questions for the tech type super-gurus.
>
> See the attached article, something I picked up on the internet &/or 
> from this list.
>
> I?ve finally got round to doing it and have bought a pair of 
> super-capacitors (SC), below:
>
> https://www.ebay.co.uk/itm/2-Pcs-4-0F-5-5-V-Super-Capacitor-H-Type-Button-Smart-Capacitance-Universal/272412952404?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
>
> The article infers to me, at least, that the + terminal of the SC is 
> wired directly to the same terminal connection on the gauge as the 
> wire from the tank sender unit. The ? terminal is earthed. How does 
> that system work? Won?t the tank?s fluctuating signal, for want of a 
> better word, simply bypass the SC and carry on flickering the needle??
>
> And, assuming I ever get the wiring sorted out, will the SC get hot? 
> Mine has a metal case and I?ve had to thoroughly insulate it. I have 
> visions of the fuel gauge working nicely until the insulation catches 
> fire???
>
> Simon
>
>
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    <p>A large capacitor will slow down the build-up of the voltage, so
      the needle of the fuel gauge (which is a Voltmeter essentially)
      will fluctuate less. It works exactly the same as an air filled
      expansion vessel in a water mains to prevent knocking in the pipes
      due to sudden pressure build caused by a water shut of valve in
      e.g. washing machines, however the water is replaced by electrons<br>
    </p>
    <p>What worries me is the 5,5V which seems rather low in a 12-15V
      electrical system, but I am not an electronic man. I do not know
      what the maximum Voltage on the gauge is, but if it is more than
      5,5V I imagine the capacitor could fail?</p>
    <p>Kees Oudesluijs</p>
    <p><br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">Op 15-11-2018 om 11:07 schreef
      <a class="moz-txt-link-abbreviated" 
href="mailto:simon.lachlan@alexarevel.plus.com";>simon.lachlan@alexarevel.plus.com</a>:<br>
    </div>
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        <p class="MsoNormal">Hi, <o:p></o:p></p>
        <p class="MsoNormal">Questions for the tech type 
super-gurus.<o:p></o:p></p>
        <p class="MsoNormal">See the attached article, something I
          picked up on the internet &amp;/or from this list.<o:p></o:p></p>
        <p class="MsoNormal">I?ve finally got round to doing it and have
          bought a pair of super-capacitors (SC), below:<o:p></o:p></p>
        <p class="MsoNormal"><a
href="https://www.ebay.co.uk/itm/2-Pcs-4-0F-5-5-V-Super-Capacitor-H-Type-Button-Smart-Capacitance-Universal/272412952404?ssPageName=STRK%3AMEBIDX%3AIT&amp;_trksid=p2060353.m2749.l2649";
            
moz-do-not-send="true">https://www.ebay.co.uk/itm/2-Pcs-4-0F-5-5-V-Super-Capacitor-H-Type-Button-Smart-Capacitance-Universal/272412952404?ssPageName=STRK%3AMEBIDX%3AIT&amp;_trksid=p2060353.m2749.l2649</a><o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">The article infers to me, at least, that
          the + terminal of the SC is wired directly to the same
          terminal connection on the gauge as the wire from the tank
          sender unit. The ? terminal is earthed. How does that system
          work? Won?t the tank?s fluctuating signal, for want of a
          better word, simply bypass the SC and carry on flickering the
          needle??<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">And, assuming I ever get the wiring sorted
          out, will the SC get hot? Mine has a metal case and I?ve had
          to thoroughly insulate it. I have visions of the fuel gauge
          working nicely until the insulation catches fire???<o:p></o:p></p>
        <p class="MsoNormal">Simon<o:p></o:p></p>
      </div>
      <br>
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