Today's Message Index:
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1. 10:37 AM - Re: OVM-14 MkIII (Jeff Luckey)
2. 07:46 PM - OVM14 MkIII, rev P1 (Robert L. Nuckolls, III)
3. 07:48 PM - Re: OVM-14 MkIII (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: OVM-14 MkIII |
Bob,
I want to turn on an idiot light that indicates an over-voltage trip event.
The attached quick-and-dirty schematic shows what I would like to do, howev
er I have not seen a final schematic for your latest OVM, so I'm working on
some assumptions.
Would this be possible, perhaps with a little hacking, with your new device
?
On Tuesday, September 19, 2023 at 11:02:34 AM PDT, Robert L. Nuckolls,
III <nuckolls.bob@aeroelectric.com> wrote:
As promised, I trimmed up a proposed schematic and part
values list for the MKIII OVM-14. I could not devise
a practical way to us a FET for the crowbar switch and
still retain the original 2-wire functionality. Did find
a suitable, sensitive-gate SCR that would work.
Got a few things to clean up on the drawing and
some notes to add. I'll get it published to the
List yet today or in the morning. Need you guys
to 'comb' it for bugs.
I think I can get the parts to fit on a board
not much bigger than the original OVM . . .
decided to stay with a board-under-heat-shrink
with flying leads. Simple, effective and low
cost.
This version has a feature I probably should
have included in the original series of
CB-OVM products . . . a press-to-test
function. Past products had to be 'bench
tested'. Given the very low parts count
and robustness of parts, it was exceedingly
unlikely that they would fail within the
lifetime of the airplane . . . yet . . . being
able to periodically verify functionality
without removing from the airplane would be 'handy'.
=C2- Bob . . .
=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2
-=C2-=C2-=C2-=C2-=C2-////
=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2
-=C2-=C2-=C2-=C2-(o o)
=C2-=C2- ===========o00o=(_)=o00o====
=====
=C2-=C2- < Go ahead, make my day . . .=C2-=C2- >
=C2-=C2- < show me where I'm wrong.=C2-=C2-=C2-=C2-=C2->
=C2-=C2- ====================
============
=C2-
=C2-=C2- In the interest of creative evolution
=C2-=C2- of the-best-we-know-how-to-do based
=C2-=C2- on physics and good practice.
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Message 2
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| Subject: | OVM14 MkIII, rev P1 |
Here 'tis.
You guys with sharp pencils and greased calculators
are encouraged to flush out the 'bugs'.
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.
Message 3
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| Subject: | Re: OVM-14 MkIII |
At 12:35 PM 9/20/2023, you wrote:
>Bob,
>
>I want to turn on an idiot light that indicates an over-voltage trip event.
>
>The attached quick-and-dirty schematic shows what I would like to
>do, however I have not seen a final schematic for your latest OVM,
>so I'm working on some assumptions.
What you've described will work . . . but do you
NOT have a low voltage warning light? What would
the ov light tell you that the lv light would not?
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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