Today's Message Index:
----------------------
1. 06:24 AM - Re: Reference documents reorganization (Eric M. Jones)
2. 11:01 AM - Re: Re: Reference documents reorganization (Robert L. Nuckolls, III)
3. 11:35 AM - Noise Filter for 5 lead motor (revenson@comcast.net)
4. 01:25 PM - Re: Noise Filter for 5 lead motor (Robert L. Nuckolls, III)
5. 03:17 PM - Question for Robert N. (Scott Derrick)
6. 05:28 PM - Re: Question for Robert N. (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Reference documents reorganization |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
nuckollsr@cox.net
>>snip... If anyone had told me 10 years ago that I
would be trying to put my arms around 150 Meg of data with
only about half the planned works still unposted, I would
have found it difficult to believe.....<<snip
And had anyone told me I could keep a gigabyte in my Swiss army
knife.........
http://www.swissknifewarehouse.com/viswusbmekn.html
Jeezzzz.............
do not archive
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
(508) 764-2072
"Hey, it ain't rocket surgery!"
--anonymous
Message 2
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Subject: | Re: Reference documents reorganization |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 09:22 AM 9/7/2005 -0400, you wrote:
>--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
>
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
>nuckollsr@cox.net
>
> >>snip... If anyone had told me 10 years ago that I
> would be trying to put my arms around 150 Meg of data with
> only about half the planned works still unposted, I would
> have found it difficult to believe.....<<snip
>
>And had anyone told me I could keep a gigabyte in my Swiss army
>knife.........
>
>http://www.swissknifewarehouse.com/viswusbmekn.html
>
>
>Jeezzzz.............
>
>do not archive
ain't 'lectronics wunderful? I've got a guy working
on protocols to use these "pendrives" as removable
storage for a line of data acquisition systems I'm
working. The goal is to have my hardware write a
comma delimited, Windows readable file directly to
the memory module so we can import directly to a variety
of spread-sheet, analysis and graphing programs. Just
5 years ago, the only way we had to practically store
that kind of data on board the flight test aircraft was
with a portable digital tape recorder at 1000x the weight
and 200x the price.
Bob . . .
Message 3
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Subject: | Noise Filter for 5 lead motor |
1.53 RCVD_NUMERIC_HELO Received: contains an IP address used for HELO
--> AeroElectric-List message posted by: revenson@comcast.net
I've got a 12VDC heater fan motor I'd like to quiet down at the source.
I read Bob's document on Radio Shack inductor/capacitor noise filters and appreciate
the simple, clear hookup diagrams. But in addition to a power lead and a
ground, this motor also has three additional leads, one each for low, medium,
and high speeds that go to the switch.
Would it do any good to use a filter on the 12v and ground leads yet ignore the
speed control wires?
Roger.
Also, Radio Shack has discontinued the 270-055 and 270-051 noise filters.
I've got a 12VDC heater fan motor I'd like to quiet down at the source.
I read Bob's document on Radio Shack inductor/capacitor noise filters and appreciate
the simple, clear hookup diagrams. But in addition to a power lead and a
ground, this motoralso has three additional leads, one each for low, medium,
and high speeds that go to theswitch.
Would it do any good to use a filter on the 12v and ground leads yet ignore the
speed control wires?
Roger.
Also,Radio Shack has discontinued the 270-055 and 270-051 noise filters.
Message 4
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Subject: | Re: Noise Filter for 5 lead motor |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 06:34 PM 9/7/2005 +0000, you wrote:
>--> AeroElectric-List message posted by: revenson@comcast.net
>
>I've got a 12VDC heater fan motor I'd like to quiet down at the source.
>I read Bob's document on Radio Shack inductor/capacitor noise filters and
>appreciate the simple, clear hookup diagrams. But in addition to a power
>lead and a ground, this motor also has three additional leads, one each
>for low, medium, and high speeds that go to the switch.
>Would it do any good to use a filter on the 12v and ground leads yet
>ignore the speed control wires?
First, have you run this motor and confirmed that you truly
need a filter? Given that there are 3 speed control leads in
addition to a power lead, I'm thinking that the control leads
do not represent a high noise risk.
>Roger.
>Also, Radio Shack has discontinued the 270-055 and 270-051 noise filters.
Fooey.
You can purchase component inductors from folks like Jameco.
Go to Jameco.com and search on
Inductors, Toroid
You can assemble the inductors and capacitors into equivalents
of the Radio Shack parts. Packaging is always the hassle. If you
truly need a filter, I'd try a capacitor first. Something on the
order of 1000 uF per Amp of motor current draw. See
http://dkc3.digikey.com/PDF/T053/0977.pdf
Bob . . .
Message 5
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Subject: | Question for Robert N. |
--> AeroElectric-List message posted by: "Scott Derrick" <scott@tnstaafl.net>
Robert,
Hows your feeling about using 1/2" copper oil lines from my engine to the
nose cooler as a ground return?
Scott
Message 6
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Subject: | Re: Question for Robert N. |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 06:16 PM 9/7/2005 -0400, you wrote:
>--> AeroElectric-List message posted by: "Scott Derrick" <scott@tnstaafl.net>
>
>Robert,
>
>Hows your feeling about using 1/2" copper oil lines from my engine to the
>nose cooler as a ground return?
It's not a "new" idea. I had some long-ez builders using an aluminum
vacuum line as a ground return about 15 years ago. It would be interesting
to see how many are still flying with that arrangement and what prompted
any changes.
I think the risks are low IF integrity of the electrical connections
are high. This means sweat soldered, large area joints that would
assure both mechanical and electrical integrity of the conduit.
The drawing at
http://www.aeroelectric.com/Pictures//Conduit_Gnd.pdf
illustrates some techniques suggested for getting high currents onto and
off of a copper conduit ground system. Similar techniques would apply
whether you ran wires or hot oil down the conduit.
Of course, the run of copper between electrical connections would have
to be similarly robust in terms of fluid tightness and electrical integrity.
Standard copper tube fittings sweat soldered together should do the job.
There are probably a trainload of prohibitions with foundations running
the gammut of regulatory mandates to sky-is-falling hysteria. But if you
can bolt a wing on correctly, one should be able to build a run of
copper that
has similar integrity for electrons and hydrocarbons.
Bob . . .
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