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OVM14 MkIII, rev P3

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Oct 02, 2023 9:09 am Post subject: OVM14 MkIII, rev P3

At 01:42 PM 10/1/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 Bob, I can't argue with your logic.  However, airplanes are toys for many of 

 us.  And builders like to equip their toys with more toys.  Take for instance 

 the VP-X Electronic Circuit Breaker System.  It has lots of nice features.  But a 

 builder could install fuses for much less money than the sales tax on the VP-X.  

 Even so, many builders elect to install the VP-X because they want the 

 extra features.  It is the same with the over-voltage module.  Some pilots 

 want the extra feature of an over-voltage indicator light.  Others might elect 

 to not install the light or reset button.

 	


   No argument there my friend. Certainly everyone here on

   the list is encouraged to fabricate the airplane

   of their dreams.



   I hope that what I bring to the List is several

   decades of experience in keep it simple, light

   as possible, low cost as possible, absolute

   conformance to a well stated design goal,

   more than passing homage to lessons learned

   and human factors.



   Yeah . . . the VPX system is a good case study.

   I'm recalling conversations with pilots while

   working the GP180 project at Lear. Over lunch

   one day, we were discussing the features of

   the latest EFIS/Navigation system being

   integrating into the proposed new airplane.



   One fellow opined that he was really pleased

   with some of our proposals, "Yeah, all that

   stuff gives us something to pass the time

   during hours of watching the ground

   crawl slowly below."



   I was tempted to suggest a pocket video game

   but I kept my mouth shut.



   I may come off as curmudgeonly in these

   discussions. For every one participating

   there are 10x present and future readers

   perhaps not so confident/capable of sorting

   out the issues. Some of these readers might

   be better served by crafting an airplane

   that behaves very much like their grandpa's

   C170. Not trying to be a hard-ass . . . just

   encouraging everyone to achieve personal

   goals with a foundation of understanding.



   Speaking of the test switch 'option', I

   have incorporated it onto the ECB as a

   maintenance aid. Latest iteration of the

   schematic attached. Also did a real estate

   survey. I think I can get this critter

   assembled and packaged it only 1/4" longer

   than the legacy design. Further, it has

   retained the simple, two wire integration

   feature of the older offerings. One can

   ignore the switch and have it work just

   like the first few hundred examples did.



   Opps, already spotted a 'bug'. R10 calculated

   value is 56.2K



   



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Mon Oct 02, 2023 10:46 am Post subject: Re: OVM14 MkIII, rev P3

Suggestion: Instead of having a wire or wires exiting the over-voltage module 

for an external switch, use an internal solid state switch that is magnetically 

operated.  These devices are small like a transistor and go by various names: 

digital magnetoresistive sensors, Unipolar Hall-effect sensor ICs, unipolar 

switches, Hall effect IC, Hall switch.  Some of these devices require either a 

north or south magnetic pole.  Others are bipolar.  They cost from less than a 

dollar on up.  For the annual OVM test, a magnet is held near a certain spot 

on the OVM.  The OVM could be mounted on one side of aluminum skin and 

the magnet held on the other side.  No external wires or switch required

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_________________
Joe Gores

Eric Page

Joined: 15 Feb 2017
Posts: 243

Posted: Mon Oct 02, 2023 12:34 pm Post subject: Re: OVM14 MkIII, rev P3

Bob, did my questions about your Rev P1 schematic slip by unnoticed? See the second post in this thread: http://forums.matronics.com/viewtopic.php?t=16781079



My 2nd question is resolved by Rev P3 but I'm still curious about questions 1, 3 and 4.



Please ignore my last question, below the dashes. I found the answer.



-Eric

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Oct 02, 2023 1:49 pm Post subject: OVM14 MkIII, rev P3

At 01:46 PM 10/2/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 Suggestion: Instead of having a wire or wires exiting the over-voltage module 

 for an external switch, use an internal solid state switch that is magnetically 

 operated.  	


 <snip>



  	  Quote: 	
		    No external wires or switch required

 	


   Hadn't considered that but it could probably

   work. Perhaps a reed switch. They'll operate

   on either magnetic polarity.



   Opted for the dip-switch. Gold, low-level

   contacts, environmentally robust. No external

   'tools' needed.



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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