Today's Message Index:
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1. 12:47 PM - Re: MANL's (current limiters) (Robert L. Nuckolls, III)
2. 01:03 PM - Re: Re: Cost effective technology (Robert L. Nuckolls, III)
3. 02:30 PM - Education is EXPENSIVE but information is FREE (Robert L. Nuckolls, III)
4. 04:45 PM - Re: Education is EXPENSIVE but information is FREE (Eric Page)
5. 06:10 PM - Re: Re: Education is EXPENSIVE but information is FREE (Robert L. Nuckolls, III)
6. 08:27 PM - aeroflash strobe repair (C&K)
Message 1
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Subject: | Re: MANL's (current limiters) |
At 10:38 PM 7/20/2018, you wrote:
>
>Are MANL standard size, standard specs other than Amp rating? I
>have one and would like to have one or two on hand, but really don't
>know how to source without some sort of spec -- Thanks!
>
>P.S. 'Lectric Bob if you read this, I am trying to match the one I
>received from you in the care package recently. How do I spec it
>othe than Amps?
>
The MANL series of limiters are commercial-off-the-shelf
products. They are made by virtually every top tier
line of suppliers but with different part/model numbers.
Here's a MIDI spec sheet from Littlefuse . . .
https://goo.gl/hiUBir
Bottom line is that unlike 'fuses' that are more
carefully crafted for thermal dynamics, these
critters are more like "fusible links" . . . they
are expected to clear hard faults (hundreds to
thousands of amps of fault current).
For our purposes, anything you can find with
an appropriate rating and 30MM hole spacing
will do fine. Most automotive applications call
for really fat rascals . . . 60 amps or more.
So Smiley Jack's Car Parts Emporium is problematic,
try these.
https://goo.gl/dXkrH4
Bob . . .
Message 2
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Subject: | Re: Cost effective technology |
At 10:08 PM 7/20/2018, you wrote:
Great discussion and certainly worth consideration of the points
alluded to here and specifically mentioned on the VAF forum
thread. I do believe if I ever built another EAB airframe, I would
be up to the challenge of doing the wiring to cover my systems and
intended usage with way more insight than what I had prior to this
first project.
Ohhh that we were born with hindsight . . . but
not all is lost. Your project is not 'crippled'
or even less 'safe' . . . you are 100x more likely
to experience a bad day in the cockpit for reasons
OTHER than having made a less than elegant design
decision on the electrics.
For now, my system is what it is, and the aircraft will be operated
with consideration for the fault/failure potential. The risk I
accept can be somewhat mitigated through thorough and particular
attention to maintenance, favorable flight conditions, conservative
operational usage and pilot training/proficiency. Eventually, I may
even retrofit this airframe with a different engine and/or panel
which would allow me to redesign the electrical system as well.
There you go! The understanding garnered from these
discussions will do more for reduction of risk
than all the advice in the world . . . advice
can be contradictory, mis-applied and/or just
plain wrong. Understanding is what lets you
sift the sands of the whole and save back
the nuggets of knowledge that keep the wheels
on your wagon (or should I say wings on your
airplane?).
I'm recalling some discussions we had here
on the list about some plug-n-play, gee-whizz
boxes nearly 20 years ago . . .
https://goo.gl/L1U42b
https://goo.gl/bMJVeL
There was a time that I was mulling over the
notion of offering a po' boys version of that
Cessna gee-whiz box I cited a few days ago . . .
but after sifting through the options and
identifying the ways my own path to electric
Nirvana failed to cover the kinds of options
addressed in the z-figures, I pitched the project.
Bob . . .
Message 3
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Subject: | Education is EXPENSIVE but information is FREE |
Had a request for recommendation on a beginner's
study text in electronics. Went on a netsearch
for a copy of my favorite teaching texts . . .
Electronics Fundamentals Circuits Devices and
Applications 8th Edition By David M Buchla
and Thomas L Floyd
and stumbled onto this website:
https://goo.gl/kJZ2Nf
Not only did it offer a .pdf copy of what I was
looking for . . .
https://goo.gl/Jad7Zk
. . . it seems that this repository offers
a huge selection of technical reference and teaching
texts. Check it out.
I'm going to put a copy on my Kindle. It never
hurts to review . . .
Bob . . .
Message 4
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Subject: | Re: Education is EXPENSIVE but information is FREE |
Excellent find, Bob! For anyone who wants electronics study material in an online
format, check out these two sites:
https://www.electronics-tutorials.ws/
https://www.allaboutcircuits.com/textbook/
Ive found both to be well-written and comprehensive. The second site also features
a very active forum with a solid core of members who answer questions and
offer help with all manner of projects.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481794#481794
Message 5
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Subject: | Re: Education is EXPENSIVE but information is |
FREE
At 06:44 PM 7/21/2018, Eric Page wrote:
>
>Excellent find, Bob! For anyone who wants
>electronics study material in an online format, check out these two sites:
>
>https://www.electronics-tutorials.ws/
>
>https://www.allaboutcircuits.com/textbook/
>
>I=99ve found both to be well-written and
>comprehensive. The second site also features a
>very active forum with a solid core of members
>who answer questions and offer help with all manner of projects.
>
>Eric
Thanks for those expansions. I'm a member but inactive
on all about circuits . . . spent some time there in the
past but there's only so much time I can devote to the
keyboard . . . the List is where I concentrate my efforts
now.
But yes, all about circuits is a really good place
to extend one's technical horizons!
Bob . . .
Message 6
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Subject: | aeroflash strobe repair |
I just had another aeroflash 151-0011 strobe power supply fail.
Interestingly it was the second one I've seen with an open 330K resistor
that was preventing triggering.
On 12 volts the unit would almost immediately charge up to 400 volts and
then shutdown until the voltage decayed.
On about 6 volts the unit would charge continuously to about 300 volts
and you could hear the trigger fire but the signal was not getting to
the white wire going to the flash tube.
Across the 330K resistor measured about 450K in circuit and it was in
fact open. It was the larger (1/2 watt) of the two 330K resistors that
failed.
Simple fix but of course the usual safety cautions of respecting high
voltage and capacitors applies. Mine self discharged quickly but yours
might not.
Ken
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