Today's Message Index:
----------------------
1. 04:29 AM - Re: Re: Anti Corrosive Zinc Paste (Henador Titzoff)
2. 05:18 AM - Re: Re: Anti Corrosive Zinc Paste (Jared Yates)
3. 05:59 AM - Re: Re: Anti Corrosive Zinc Paste (Henador Titzoff)
4. 06:08 AM - Re: Feels like voltage to me (Eric M. Jones)
5. 06:10 AM - Re: Feels like voltage to me (user9253)
6. 11:12 AM - Re: Feels like voltage to me (Jay Hyde)
7. 11:12 AM - Re: Re: AEC9001 Schottky diode in Z-13/8 (Jay Hyde)
8. 11:19 AM - Re: Re: Anti Corrosive Zinc Paste (Jay Hyde)
9. 07:47 PM - Re: connect 1-5 volt fuel level sender to legacy type fuel ga (nuckollsr)
10. 08:09 PM - Re: Initial Software Code for the Open Source Wig-Wag Controller (nuckollsr)
11. 09:57 PM - Re: Re: connect 1-5 volt fuel level sender to legacy type fuel ga (Paul Millner)
Message 1
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| Subject: | Re: Anti Corrosive Zinc Paste |
Paul,=0A=0AI don't believe you're giving Hitler and Mussolini enough credit
. -If they were around today, no doubt they would be successful, big comp
any retired CEOs. Hitler's resume would have had the following "bullets:"
=0A* Implemented Sic Stigma=0A* Ran Germania Corporation for 12 years
until successfully sold to United States in hostile takeover for billions
of dollars=0A* Increased assets by annexing Polandia Corporation in a ho
stile takeover=0A* Milked Polandia Corporation out of all resources, the
n sold it to Russiatania Corporatioin for billions of dollars=0A* Plunde
red Romaniska Corporation in another hostile takeover to effectively utiliz
e its oil reserves and other resources=0A* Annexed Franconia Corporation
in order to increase world visibility and utilize resources to satisfy sto
ckholders=0A* Generated multiple patents during tenure that are in use w
orldwide today-=0A=0A* Ordered HR to implement ethnic awareness and cl
eansing=0A* Successfully relocated problem employees to test labs and ex
periment stations=0A* Successfully shut down corporation during a hostil
e takeover by USA to satisfy stockholders and increase profits=0A* Creat
ed synergistic environment to allow smooth transition to new corporate mana
gement and bowed out gracefully=0AHenador Titzoff=0A=0A=0A_________________
_______________=0A From: Paul Millner <millner@me.com>=0ATo: aeroelectric-l
ist@matronics.com =0ASent: Tuesday, May 22, 2012 3:52 PM=0ASubject: Re: Aer
oElectric-List: Re: Anti Corrosive Zinc Paste=0A =0A=0AUnfortunately, utili
ty hiring policies don't always select for the brightest bulbs, excusing th
e pun... which sometimes can be quite a challenge for their sophisticated c
ustomers who labor mightily, at times, to convince them that, for instance,
current *still* equals voltage times resistance, or similar advanced conce
pts.=0A=0AI once had to have days of meetings, and finally they had to fly
=0A their B+ student out from headquarters, to understand that it really
=0A was OK if we *gave* them a little power free from time to time to=0A
improve voltage regulation of their system in our neighborhood.-=0A
Fortunately, he brightened (there's that pun again) and said, "Oh, I=0A
get it!"- Revised contract language and relay settings were then=0A
only months of work process in coming.=0A=0AIt's kind of like government, t
hough... the cynic says you want your=0A best minds being entrepreneuria
l... not running the bureaucracies=0A like Hitler and Mussolini did... :
-)=0A=0APaul=0A=0AOn 5/21/2012 4:06 PM, Henador Titzoff wrote: =0AThanks, E
ric, I appreciate your analytic approach to our problems, with tests to det
ermine validity.=0A>=0A>=0A>Today I went to AutoZone and bought some Permat
ex Dielectric Grease in an 8 oz squeeze tube. -It should last me for seve
ral years.=0A>=0A>=0A>Also, today I saw three local electric utility guys g
et out of a Chevrolet souped up truck and start looking at one of their box
es. -Two of them seemed to know what they were doing, while one was study
ing what I was doing, which was studying what they were doing. I walked acr
oss the street and asked them what they were doing, and he said that Engine
ering was looking at a switch box to see how it functioned. -I asked him
what it was switching, and he said 12,000V. -I asked him how it got stepp
ed down to 240V and 120V, and he said he didn't know. -He asked one of th
e other guys, and they started looking around, finally spotting a box about
two doors down. -He said that box was a step down transformer. -I aske
d him if he knew what Penetrox or No-Ox-ID was, and he said no and asked me
what they were. I told him they were pastes with zinc used to coat aluminu
m wires to keep them from corroding, and he said he had heard of something
like that. -I'm not
sure where they dug up this fossil, but for an electric utility engineer,
he didn't know squat about his company's technology. -I'm now guessing he
was a mismanager.=0A>=0A>=0A>Henador Titzoff=0A>=0A>From: Eric M. Jones <e
mjones@charter.net>=0A>To: aeroelectric-list@matronics.com =0A>Sent: Monday
, May 21, 2012 9:00 AM=0A>Subject: AeroElectric-List: Re: Anti Corrosive Zi
<emjones@charter.net>=0A>=0A>I looked up Penetrox and there are
several types; some for=0A copper-to- copper, some for aluminum
-to-copper or=0A aluminum-to-aluminum. =0A>=0A>Some history here
is required: Years ago we experimented=0A with materials that c
ontained suspended copper or silver for=0A the purpose of heat s
inking large Xenon lamps, while=0A simultaneously conducting cur
rent (>20A). Here what=0A happened: KA-BLAM-O!!!=0A>=0A>So we sl
inked back to using zinc oxide in silicone oil and=0A no more pr
oblem. Why we thought suspended metal particles=0A was a good id
ea is obvious...and wrong.=0A>=0A>What happened was that the suspended meta
l particles=0A conducted current while simultaneously preventing
the really=0A big flat contacts from mating. And the current yo
u can=0A conduct with thousands of microscopic particles is quit
e=0A limited.=0A>=0A>So: Using goop with suspended metal particl
es is probably a=0A good idea at low current and modest voltage.
..like a=0A connection to aluminum antennae, or Al-Cu pigtails i
n homes=0A wired with aluminum. But it's probably a really bad i
dea=0A with high currents at low voltages. Of course this depend
s=0A on the size of the particles, the materials and hardness of
=0A the connectors and the pressure of the joint. =0A>=0A>But I
wouldn't use the metal-particle goop without thinking=0A about i
t carefully.=0A>=0A>--------=0A>Eric M. Jones=0A>www.PerihelionDesign.com
=0A>113 Brentwood Drive=0A>Southbridge, MA 01550=0A>(508) 764-2072=0A>emjon
es(at)charter.net=0A>=0A>=0A>=0A>=0A>Read this topic online here:=0A>=0A>ht
tp://forums.matronics.com/viewtopic.php?p=373466#373466 http://www.matron
ics.com/Navigator?- - - - - - - - MATRONICS WEB FORUMS -<-
- - - - - - - - - -============
=============0A>=0A>=0A>=0A>=0A>=0A> =0A=0A-- =0APl
ease note my new email address! millner@me.com
Message 2
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| Subject: | Re: Anti Corrosive Zinc Paste |
The other day I was communicating with an airplane builder about electrical
systems in an online venue other than this one. His ideas weren't
consistent with what I've come to understand as best practices, so I
suggested that he join the AEC list. His response was "the last thing I
need is that many email messages in my inbox every day." I thought it was
such a shame that he felt that way, and that in some sense, his safety of
flight would be jeopardized for reasons that amount to nothing more than
logistics. Is it his own fault because he didn't want to just delete the
unrelated messages? Is it the fault of the list moderators for not running
a tighter ship? I'm sure that those are both factors, but neither is
entirely responsible. Certainly there are many discussions that stray from
the electrical system topics that are still useful and educational (with
the recent paste discussion being one of many). Is it possible to have a
list that stays on topic, but still keeps the benefits of group interaction
and crowd-sourcing? I don't know, but I do know that I've seen online
communities grow strong, fail, and even be brought back from the brink.
The most prominent common feature that I see among failed or failing
groups is a lack of civility, and respect among members. That usually
starts with author anonymity, which thankfully we don't typically have
here. It usually continues with off-topic discussions that are
contentious, as political discussions always are. It seems inevitable that
one side or the other usually starts to make more noise, and the folks on
the other side gradually leave until all that's left is an echo chamber of
like-minded folks who keep coming back just so that they can be around
people who agree with them. I sure hope that this list isn't going to go
down a path that leads to this kind of end. I don't think that we're
anywhere close to that state yet, and that's why I bring it up- this is how
it starts, and like many other infectious patterns, early intervention is
certainly the most effort-effective solution. So as list members, what are
we going to do? Are we going to each take individual responsibility to
keep the group on topic? Are we going to let the list become what it may,
for better or worse, just so that we can get our points across? I'd like
to vote for option 1, and encourage others to do the same. I don't know
which is better or which will prevail. But I do know that I have enough
faith in Bob's work to bet my life on it, and I'd certainly like to have a
place where I can stay abreast of changes and updates to the system
designs, and the gradual changes to what we think of as best practices.
Wouldn't it be great if this list can continue to be that source? Isn't
that more likely to be the case if we can stay away from these kinds of
discussions, whether or not we agree with the points?
On May 23, 2012, at 7:22, Henador Titzoff <henador_titzoff@yahoo.com> wrote:
Paul,
I don't believe you're giving Hitler and Mussolini enough credit. If they
were around today, no doubt they would be successful, big company retired
CEOs. Hitler's resume would have had the following "bullets:"
- Implemented Sic Stigma
- Ran Germania Corporation for 12 years until successfully sold to
United States in hostile takeover for billions of dollars
- Increased assets by annexing Polandia Corporation in a hostile takeover
- Milked Polandia Corporation out of all resources, then sold it to
Russiatania Corporatioin for billions of dollars
- Plundered Romaniska Corporation in another hostile takeover to
effectively utilize its oil reserves and other resources
- Annexed Franconia Corporation in order to increase world visibility
and utilize resources to satisfy stockholders
- Generated multiple patents during tenure that are in use worldwide
today
- Ordered HR to implement ethnic awareness and cleansing
- Successfully relocated problem employees to test labs and experiment
stations
- Successfully shut down corporation during a hostile takeover by USA to
satisfy stockholders and increase profits
- Created synergistic environment to allow smooth transition to new
corporate management and bowed out gracefully
Henador Titzoff
------------------------------
*From:* Paul Millner <millner@me.com>
*To:* aeroelectric-list@matronics.com
*Sent:* Tuesday, May 22, 2012 3:52 PM
*Subject:* Re: AeroElectric-List: Re: Anti Corrosive Zinc Paste
Unfortunately, utility hiring policies don't always select for the
brightest bulbs, excusing the pun... which sometimes can be quite a
challenge for their sophisticated customers who labor mightily, at times,
to convince them that, for instance, current *still* equals voltage times
resistance, or similar advanced concepts.
I once had to have days of meetings, and finally they had to fly their B+
student out from headquarters, to understand that it really was OK if we
*gave* them a little power free from time to time to improve voltage
regulation of their system in our neighborhood. Fortunately, he brightened
(there's that pun again) and said, "Oh, I get it!" Revised contract
language and relay settings were then only months of work process in coming.
It's kind of like government, though... the cynic says you want your best
minds being entrepreneurial... not running the bureaucracies like Hitler
and Mussolini did... :-)
Paul
On 5/21/2012 4:06 PM, Henador Titzoff wrote:
Thanks, Eric, I appreciate your analytic approach to our problems, with
tests to determine validity.
Today I went to AutoZone and bought some Permatex Dielectric Grease in an
8 oz squeeze tube. It should last me for several years.
Also, today I saw three local electric utility guys get out of a Chevrolet
souped up truck and start looking at one of their boxes. Two of them
seemed to know what they were doing, while one was studying what I was
doing, which was studying what they were doing. I walked across the street
and asked them what they were doing, and he said that Engineering was
looking at a switch box to see how it functioned. I asked him what it was
switching, and he said 12,000V. I asked him how it got stepped down to
240V and 120V, and he said he didn't know. He asked one of the other guys,
and they started looking around, finally spotting a box about two doors
down. He said that box was a step down transformer. I asked him if he
knew what Penetrox or No-Ox-ID was, and he said no and asked me what they
were. I told him they were pastes with zinc used to coat aluminum wires to
keep them from corroding, and he said he had heard of something like that.
I'm not sure where they dug up this fossil, but for an electric utility
engineer, he didn't know squat about his company's technology. I'm now
guessing he was a mismanager.
Henador Titzoff
*From:* Eric M. Jones <emjones@charter.net> <emjones@charter.net>
*To:* aeroelectric-list@matronics.com
*Sent:* Monday, May 21, 2012 9:00 AM
*Subject:* AeroElectric-List: Re: Anti Corrosive Zinc Paste
emjones@charter.net>
I looked up Penetrox and there are several types; some for copper-to-
copper, some for aluminum-to-copper or aluminum-to-aluminum.
Some history here is required: Years ago we experimented with materials
that contained suspended copper or silver for the purpose of heat sinking
large Xenon lamps, while simultaneously conducting current (>20A). Here
what happened: KA-BLAM-O!!!
So we slinked back to using zinc oxide in silicone oil and no more problem.
Why we thought suspended metal particles was a good idea is obvious...and
wrong.
What happened was that the suspended metal particles conducted current
while simultaneously preventing the really big flat contacts from mating.
And the current you can conduct with thousands of microscopic particles is
quite limited.
So: Using goop with suspended metal particles is probably a good idea at
low current and modest voltage...like a connection to aluminum antennae, or
Al-Cu pigtails in homes wired with aluminum. But it's probably a really bad
idea with high currents at low voltages. Of course this depends on the size
of the particles, the materials and hardness of the connectors and the
pressure of the joint.
But I wouldn't use the metal-particle goop without thinking about it
carefully.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373466#373466
http://www.matronics.com/Navigator? - MATRONICS WEB FORUMS -<
=======================
*
*
--
Please note my new email address!millner@me.com
*
*
Message 3
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| Subject: | Re: Anti Corrosive Zinc Paste |
I agree with you wholeheartedly, Jared. -I apologize for posting the mess
age below. -Let's get back on topic.=0A-=0AHenador Titzoff=0A=0A=0A=0A_
_______________________________=0A From: Jared Yates <email@jaredyates.com>
=0ATo: "aeroelectric-list@matronics.com" <aeroelectric-list@matronics.com>
=0ASent: Wednesday, May 23, 2012 8:13 AM=0ASubject: Re: AeroElectric-List:
Re: Anti Corrosive Zinc Paste=0A =0A=0AThe other day I was communicating wi
th an airplane builder about electrical systems in an online venue other th
an this one. -His ideas weren't consistent with what I've come to underst
and as best practices, so I suggested that he join the AEC list. -His res
ponse was "the last thing I need is that many email messages in my inbox ev
ery day." -I thought it was such a shame that he felt that way, and that
in some sense, his safety of flight would be jeopardized for reasons that a
mount to nothing more than logistics. -Is it his own fault because he did
n't want to just delete the unrelated messages? -Is it the fault of the l
ist moderators for not running a tighter ship? -I'm sure that those are b
oth factors, but neither is entirely responsible. -Certainly there are ma
ny discussions that stray from the electrical system topics that are still
useful and educational (with the recent paste discussion being one of many)
. -Is it possible to have a list that
stays on topic, but still keeps the benefits of group interaction and crow
d-sourcing? -I don't know, but I do know that I've seen online communitie
s grow strong, fail, and even be brought back from the brink. -The most p
rominent common feature that I see among failed or failing groups is a lack
of civility, and respect among members. -That usually starts with author
-anonymity, which thankfully we don't typically have here. -It usually
continues with off-topic discussions that are contentious, as political dis
cussions always are. -It seems inevitable that one side or the other usua
lly starts to make more noise, and the folks on the other side gradually le
ave until all that's left is an echo chamber of like-minded folks who keep
coming back just so that they can be around people who agree with them. -
I sure hope that this list isn't going to go down a path that leads to this
kind of end. -I don't think that we're anywhere close to that state yet,
and that's why I bring it up- this is how it starts, and like many other i
nfectious patterns, early intervention is certainly the most effort-effecti
ve solution. -So as list members, what are we going to do? -Are we goin
g to each take individual responsibility to keep the group on topic? -Are
we going to let the list become what it may, for better or worse, just so
that we can get our points across? -I'd like to vote for option 1, and en
courage others to do the same. -I don't know which is better or which wil
l prevail. -But I do know that I have enough faith in Bob's work to bet m
y life on it, and I'd certainly like to have a place where I can stay abrea
st of changes and updates to the system designs, and the gradual changes to
what we think of as best practices. -Wouldn't it be great if this list c
an continue to be that source? -Isn't that more likely to be the case if
we can stay away from these kinds of discussions, whether or not we agree
with the points?=0A=0A=0A=0AOn May 23, 2012, at 7:22, Henador Titzoff <hen
ador_titzoff@yahoo.com> wrote:=0A=0A=0APaul,=0A>=0A>=0A>I don't believe you
're giving Hitler and Mussolini enough credit. -If they were around today
, no doubt they would be successful, big company retired CEOs. Hitler's res
ume would have had the following "bullets:"=0A>* Implemented Sic Stigma
=0A>* Ran Germania Corporation for 12 years until successfully sold to U
nited States in hostile takeover for billions of dollars=0A>* Increased
assets by annexing Polandia Corporation in a hostile takeover=0A>* Milke
d Polandia Corporation out of all resources, then sold it to Russiatania Co
rporatioin for billions of dollars=0A>* Plundered Romaniska Corporation
in another hostile takeover to effectively utilize its oil reserves and oth
er resources=0A>* Annexed Franconia Corporation in order to increase wor
ld visibility and utilize resources to satisfy stockholders=0A>* Generat
ed multiple patents during tenure that are in use worldwide today-=0A>=0A
>* Ordered HR to implement ethnic awareness and cleansing=0A>* Succes
sfully relocated problem employees to test labs and experiment stations=0A>
* Successfully shut down corporation during a hostile takeover by USA to
satisfy stockholders and increase profits=0A>* Created synergistic envi
ronment to allow smooth transition to new corporate management and bowed ou
t gracefully=0A>Henador Titzoff=0A>=0A>=0A>________________________________
=0A> From: Paul Millner <millner@me.com>=0A>To: aeroelectric-list@matronics
.com =0A>Sent: Tuesday, May 22, 2012 3:52 PM=0A>Subject: Re: AeroElectric-L
ist: Re: Anti Corrosive Zinc Paste=0A> =0A>=0A>Unfortunately, utility hirin
g policies don't always select for the brightest bulbs, excusing the pun...
which sometimes can be quite a challenge for their sophisticated customers
who labor mightily, at times, to convince them that, for instance, current
*still* equals voltage times resistance, or similar advanced concepts.=0A>
=0A>I once had to have days of meetings, and finally they had to fly=0A
their B+ student out from headquarters, to understand that it really=0A
was OK if we *gave* them a little power free from time to time to=0A imp
rove voltage regulation of their system in our neighborhood.-=0A Fortu
nately, he brightened (there's that pun again) and said, "Oh, I=0A get i
t!"- Revised contract language and relay settings were then=0A only mo
nths of work process in coming.=0A>=0A>It's kind of like government, though
... the cynic says you want your=0A best minds being entrepreneurial...
not running the bureaucracies=0A like Hitler and Mussolini did... :-)=0A
>=0A>Paul=0A>=0A>On 5/21/2012 4:06 PM, Henador Titzoff wrote: =0A>Thanks, E
ric, I appreciate your analytic approach to our problems, with tests to det
ermine validity.=0A>>=0A>>=0A>>Today I went to AutoZone and bought some Per
matex Dielectric Grease in an 8 oz squeeze tube. -It should last me for s
everal years.=0A>>=0A>>=0A>>Also, today I saw three local electric utility
guys get out of a Chevrolet souped up truck and start looking at one of the
ir boxes. -Two of them seemed to know what they were doing, while one was
studying what I was doing, which was studying what they were doing. I walk
ed across the street and asked them what they were doing, and he said that
Engineering was looking at a switch box to see how it functioned. -I aske
d him what it was switching, and he said 12,000V. -I asked him how it got
stepped down to 240V and 120V, and he said he didn't know. -He asked one
of the other guys, and they started looking around, finally spotting a box
about two doors down. -He said that box was a step down transformer. -
I asked him if he knew what Penetrox or No-Ox-ID was, and he said no and as
ked me what they were. I told him they were pastes with zinc used to coat a
luminum wires to keep them from corroding, and he said he had heard of some
thing like that. -I'm
not sure where they dug up this fossil, but for an electric utility engine
er, he didn't know squat about his company's technology. -I'm now guessin
g he was a mismanager.=0A>>=0A>>=0A>>Henador Titzoff=0A>>=0A>>From: Eric M.
Jones <emjones@charter.net>=0A>>To: aeroelectric-list@matronics.com =0A>>S
ent: Monday, May 21, 2012 9:00 AM=0A>>Subject: AeroElectric-List: Re: Anti
c M. Jones"=0A <emjones@charter.net>=0A>>=0A>>I looked up Penetr
ox and there are several types; some for=0A copper-to- copper, s
ome for aluminum-to-copper or=0A aluminum-to-aluminum. =0A>>=0A>
>Some history here is required: Years ago we experimented=0A wit
h materials that contained suspended copper or silver for=0A the
purpose of heat sinking large Xenon lamps, while=0A simultaneou
sly conducting current (>20A). Here what=0A happened: KA-BLAM-O!
!!=0A>>=0A>>So we slinked back to using zinc oxide in silicone oil and=0A
no more problem. Why we thought suspended metal particles=0A
was a good idea is obvious...and wrong.=0A>>=0A>>What happened was t
hat the suspended metal particles=0A conducted current while sim
ultaneously preventing the really=0A big flat contacts from mati
ng. And the current you can=0A conduct with thousands of microsc
opic particles is quite=0A limited.=0A>>=0A>>So: Using goop with
suspended metal particles is probably a=0A good idea at low cur
rent and modest voltage...like a=0A connection to aluminum anten
nae, or Al-Cu pigtails in homes=0A wired with aluminum. But it's
probably a really bad idea=0A with high currents at low voltage
s. Of course this depends=0A on the size of the particles, the m
aterials and hardness of=0A the connectors and the pressure of t
he joint. =0A>>=0A>>But I wouldn't use the metal-particle goop without thin
king=0A about it carefully.=0A>>=0A>>--------=0A>>Eric M. Jones
=0A>>www.PerihelionDesign.com=0A>>113 Brentwood Drive=0A>>Southbridge, MA 0
1550=0A>>(508) 764-2072=0A>>emjones(at)charter.net=0A>>=0A>>=0A>>=0A>>=0A>>
Read this topic online here:=0A>>=0A>>http://forums.matronics.com/viewtopic
.php?p=373466#373466 http://www.matronics.com/Navigator?- - - -
- - - - MATRONICS WEB FORUMS -<- - - - - - - - -
- -======================
===0A>>=0A>>=0A>>=0A>>=0A>>=0A>> =0A>=0A>-- =0APlease note my new email
address! millner@me.com=0A>=0A>=0A>ist" target="_blank">http://www.matro
nics.com/Navigator?AeroElectric-List=0Atp://forums.matronics.com=0A_blank">
=====
Message 4
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| Subject: | Re: Feels like voltage to me |
My dad told the story that when he was an engineer on the Westinghouse East Pittsburgh
"Atom Smasher" around 1940--One day he was on a platform that suddenly
became electrified. He was instantly shocked with about a million volts pulsing
at microsecond charging pulses (and at substantial current!).
When he screamed for help someone cut the power. He kidded my dad, "What's the
problem?...those were just microsecond pulses".
"Yes" said Dad, "But those were the most uncomfortable microseconds of my life..."
do not archive
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373648#373648
Message 5
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| Subject: | Re: Feels like voltage to me |
I have heard about navy electricians finding a blown fuse by using their hand as
a voltage tester. Evidently ships have banks of exposed fuses on panel boards.
The electrician would touch each fuse with his thumb and finger as he ran
his hand along the rows of fuses. When he received a shock in his hand, he knew
that fuse was bad.
I used a neon voltage tester at work on 3 phase 480VAC. If the neon light lit
up when touching the 2 ends of a fuse, then that fuse was bad. Another test
touches the top of one fuse and the bottom of the adjoining fuse. In this case,
the tester should illuminate if all is well.
The same principle is used in automotive (or aviation) fuses that illuminate
when blown. The LED that is in parallel with the fuse illuminates when the fuse
is blown because it is in series with the load. If the load is disconnected,
the blown fuse indicator will not work.
Joe
--------
Joe Gores
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| Subject: | Feels like voltage to me |
Correct; voltage does not kill, current flow does- ask any live line worker
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Paul
Millner
Sent: 23 May 2012 07:57 AM
Subject: AeroElectric-List: Feels like voltage to me
Touching at the same time has nothing to do with the relative safety, or
foolishness. of this approach. You could touch one finger, wait 30 seconds,
and touch the second without any increase in risk, or for that matter,
improvement in safety. In fact, going slower might just improve the safety
slightly... but don't do this anyway!
Paul
On 5/22/2012 10:10 AM, rayj wrote:
> --> <raymondj@frontiernet.net>
>
> I really have to ask. Are you making the claim that in all the years
> "Sparky" used his fingers, He NEVER had his fingertips touch at
> different times? Assuming 60Hz, a difference in contact times of the
> the fingertips of 1/30 of a second would allow more than enough time
> for any affect that was going to take place between 1st and 2nd finger
> contact.
>
> Never more than 1/30 of a second, ever.
>
> I'm skeptical.
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| Subject: | Re: AEC9001 Schottky diode in Z-13/8 |
Nope- it should be named 'Damned funny and interesting stories!'
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jeff
Luckey
Sent: 23 May 2012 05:09 AM
Subject: RE: AeroElectric-List: Re: AEC9001 Schottky diode in Z-13/8
This thread should be renamed to "STUPID Electrician Tricks".
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Henador
Titzoff
Sent: Tuesday, May 22, 2012 17:33
Subject: Re: AeroElectric-List: Re: AEC9001 Schottky diode in Z-13/8
Seems to me that all this voltage touchly-feely stuff is actually machismo
at work. Why not just use appropriate meters or tools to determine if >0V
is present? This has the advantage of quantifying the voltage to a
reasonable level rather than counting the number of nads hairs standing up.
Henador Titzoff
_____
From: MikeDunlop <mdunlop001@aol.com>
Sent: Tuesday, May 22, 2012 6:16 PM
Subject: AeroElectric-List: Re: AEC9001 Schottky diode in Z-13/8
I can relate to some of these things, I started my working life as a
mechanic and would like to have had a prize for every time I got zapped by
touching the wrong end of a spark plug lead, 50k DC volts but no amps as
such, one of the mechanics could stand there all day holding on to a live
spark lead, I couldn't stand it... all it done was make me swear a lot
though.
On the other side of the coin, I had a friend who accidentally dropped a
spanner across a 14k AC buss bar in a power station and received horrendous
injuries including amputation of one arm.
Moral of the story... know what you're dealing with and don't take chances.
Miked (UK)
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| Subject: | Re: Anti Corrosive Zinc Paste |
J Most bright people are too busy inventing the next amazing thing to worry
about how the present amazing thing is being applied/ installed/ used.
I recently gave a birthday speech in which I noted that what one certainly
does NOT want in life is mediocrity, and that, considering my friends, I
could observe a paucity of mediocrity. I am most pleased to say that this
is the same on the aeroelectric list!
Jay
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Paul
Millner
Sent: 22 May 2012 09:52 PM
Subject: Re: AeroElectric-List: Re: Anti Corrosive Zinc Paste
Unfortunately, utility hiring policies don't always select for the brightest
bulbs, excusing the pun... which sometimes can be quite a challenge for
their sophisticated customers who labor mightily, at times, to convince them
that, for instance, current *still* equals voltage times resistance, or
similar advanced concepts.
I once had to have days of meetings, and finally they had to fly their B+
student out from headquarters, to understand that it really was OK if we
*gave* them a little power free from time to time to improve voltage
regulation of their system in our neighborhood. Fortunately, he brightened
(there's that pun again) and said, "Oh, I get it!" Revised contract
language and relay settings were then only months of work process in coming.
It's kind of like government, though... the cynic says you want your best
minds being entrepreneurial... not running the bureaucracies like Hitler and
Mussolini did... :-)
Paul
On 5/21/2012 4:06 PM, Henador Titzoff wrote:
Thanks, Eric, I appreciate your analytic approach to our problems, with
tests to determine validity.
Today I went to AutoZone and bought some Permatex Dielectric Grease in an 8
oz squeeze tube. It should last me for several years.
Also, today I saw three local electric utility guys get out of a Chevrolet
souped up truck and start looking at one of their boxes. Two of them seemed
to know what they were doing, while one was studying what I was doing, which
was studying what they were doing. I walked across the street and asked them
what they were doing, and he said that Engineering was looking at a switch
box to see how it functioned. I asked him what it was switching, and he
said 12,000V. I asked him how it got stepped down to 240V and 120V, and he
said he didn't know. He asked one of the other guys, and they started
looking around, finally spotting a box about two doors down. He said that
box was a step down transformer. I asked him if he knew what Penetrox or
No-Ox-ID was, and he said no and asked me what they were. I told him they
were pastes with zinc used to coat aluminum wires to keep them from
corroding, and he said he had heard of something like that. I'm not sure
where they dug up this fossil, but for an electric utility engineer, he
didn't know squat about his company's technology. I'm now guessing he was a
mismanager.
Henador Titzoff
From: Eric M. Jones <mailto:emjones@charter.net> <emjones@charter.net>
Sent: Monday, May 21, 2012 9:00 AM
Subject: AeroElectric-List: Re: Anti Corrosive Zinc Paste
<emjones@charter.net>
I looked up Penetrox and there are several types; some for copper-to-
copper, some for aluminum-to-copper or aluminum-to-aluminum.
Some history here is required: Years ago we experimented with materials that
contained suspended copper or silver for the purpose of heat sinking large
Xenon lamps, while simultaneously conducting current (>20A). Here what
happened: KA-BLAM-O!!!
So we slinked back to using zinc oxide in silicone oil and no more problem.
Why we thought suspended metal particles was a good idea is obvious...and
wrong.
What happened was that the suspended metal particles conducted current while
simultaneously preventing the really big flat contacts from mating. And the
current you can conduct with thousands of microscopic particles is quite
limited.
So: Using goop with suspended metal particles is probably a good idea at low
current and modest voltage...like a connection to aluminum antennae, or
Al-Cu pigtails in homes wired with aluminum. But it's probably a really bad
idea with high currents at low voltages. Of course this depends on the size
of the particles, the materials and hardness of the connectors and the
pressure of the joint.
But I wouldn't use the metal-particle goop without thinking about it
carefully.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
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| Subject: | Re: connect 1-5 volt fuel level sender to legacy type |
fuel ga
Paul, sorry to have let this dangle. Got distracted with graduation things last
week and was away from the computer. Now my SMTP service seems broken on matronics
so I'm using the web-access utility.
Your query prompts this idea. There's a joint-venture wig-wag controller project
going on that will take a jump forward tomorrow when I get some boards stuffed
and shipped. With a slight modification to the electronics, this same assembly
could become a signal conditioner that would accept your fuel level data and
drive it past a look-up table to output the the correct current for the gage.
All issues of calibration and linearity can be washed out.
I'll pray over this some more and see what the hardware might look like. We may
be able to find a byte-herder on the List who can do some code for you.
Bob . . .
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| Subject: | Re: Initial Software Code for the Open Source Wig-Wag |
Controller
The power FETS for the joint collaboration on a new Wig-Wag are here. I thought
I was going to get time to build some POC first articles last night . . . but
one of the light fixtures over my bench crapped.
TWO lessons learned: These $10 Wallmart fixtures are very unfriendly for replacement
of ballast. Further, if ballast replacement in less than 10 years is a modern
reality, then make sure your installation is friendly to the task of taking
the entire fixture down for replacement. The toggle bolts I used to hold a
two-fixture strip to the ceiling went through close fit holes in the fixture
(insert cursing and blood spatters here). NOW the bolt goes through a large clearance
hole courtesy of Mr. Dremmel and his magic cut-off wheels. The next replacement
will be easy.
Anyhow, I'll get the two POC items built this evening.
Bob . . .
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| Subject: | Re: connect 1-5 volt fuel level sender to legacy |
type fuel ga
Thanks Bob! Aloha from the big island of Hawaii...
Paul
On 5/23/2012 7:45 PM, nuckollsr wrote:
> --> AeroElectric-List message posted by: "nuckollsr"<bob.nuckolls@aeroelectric.com>
>
> Paul, sorry to have let this dangle. Got distracted with graduation things last
week and was away from the computer. Now my SMTP service seems broken on matronics
so I'm using the web-access utility.
>
> Your query prompts this idea. There's a joint-venture wig-wag controller project
going on that will take a jump forward tomorrow when I get some boards stuffed
and shipped. With a slight modification to the electronics, this same assembly
could become a signal conditioner that would accept your fuel level data
and drive it past a look-up table to output the the correct current for the gage.
All issues of calibration and linearity can be washed out.
>
> I'll pray over this some more and see what the hardware might look like. We may
be able to find a byte-herder on the List who can do some code for you.
>
> Bob . . .
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=373723#373723
>
>
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