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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Fri 05/19/23: 1
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Today's Message Index:
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     1. 08:09 AM - Re: Re: Which Oil Pressure Switch?  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 08:09:34 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Which Oil Pressure Switch?

At 11:43 AM 5/8/2023, you wrote:

    Been out-of-pocket for a few days . . . returning
    to the 'oil pressure switch thread' . . .

>=C2  Either way works. But I'm mystified as to why
>=C2  the SureFly would depend on Slick operations
>=C2  to provide a tach signal . . .
>=C2  Bob . . .
>
>I suspect that what he's saying is that the 
>Surefly doesn't output a tach signal usable in 
>the same fashion as the mag p-lead signal. 
>Therefore, there's no signal to any electronic 
>tach if the mag is off. Pretty common situation 
>with aftermarket electronic ignitions for Lycs.


   Aha! but of course. Given that a hall-effect
   tach pickup has been added to the conversation,
   making that signal activate the hour-meter as
   well is easy. Of course, there's a further
   benefit that the tach/hour-meter functions
   are independent of conditions of either
   ignition system.

   I've sketched out an adapter circuit that would
   interface the square wave output of your tachometer
   pickup to the hour-meter.

   The suggested transistor is hugely 'too-robust'
   for the task but it's in a large package that
   yields to 'spider-web' assembly of the components
   directly to the transistor case before protecting
   in some suitable encapsulant (E6000, JB Kwik, etc.)

   Alternatively, this could be assembled on some
   form of prototyping board in which case, ANY
   logic level n-fet would be find.

   If you wish, I can hammer this together out
   of my junkbox. It would be fitted with flying
   leads for interposition between your tach and
   hour-meter.


   Bob . . .

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    In the interest of creative evolution
    of the-best-we-know-how-to-do based
    on physics and good practice.

 

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