Today's Message Index:
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1. 09:09 AM - Re: Which Diode part number to use for dual power feed? (Robert L. Nuckolls, III)
2. 10:55 AM - Re: Which Diode part number to use for dual power feed? (plevyakh)
3. 04:34 PM - Autocad on the web (JohnInReno)
4. 06:10 PM - Re: Autocad on the web (Richard Tasker)
5. 07:28 PM - Re: Autocad on the web (Robert L. Nuckolls, III)
6. 07:49 PM - Re: coil tuning anyone? (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Which Diode part number to use for dual power |
feed?
At 07:36 PM 4/11/2011, you wrote:
>
>If the EIS is to be your primary voltage monitor and low voltage
>warning don't forget that it will read low by around 0.6 volts if
>powered through a silicon diode. That said I think any 1N5400 series
>(1N5401, 1N5402, etc.) would be sufficient as I think I only have a
>2 or 3 amp fuse on my EIS4000.
>
>Further with the diodes you will not get a low voltage warning from
>the main EIS voltmeter if the main supply fails. AUX inputs can be
>used for that purpose though.
>
>Another approach is a two position power switch if you really want
>it. I can see some comfort value in having a voltage reading if
>operating an electric dependent engine after an alternator failure
>but I did not consider it essential.
Excellent points . . .
Even when such multi-purpose instruments are operated
from the e-bus, normal voltage readings would be at
some level below real voltage readings. Which is not
a particularly relevant fact.
When architecture decisions are finalized, the effects
to CALIBRATION can and should be considered. Your
'normal' voltage readings for standard ops might now
be 13.5 volts as opposed to 14.2 . . . this is an
entry into the POH, not a fact that calls for any
agonizing over making tweaks to architecture or work-
arounds (like substituting switches for diodes).
If the EIS4000 is your only source for low voltage
annunciation, then you might consider running the
EIS from the main bus. If you loose the alternator
in cruising flight and your plan-B calls for
shutting down the main bus for ENDURANCE, I see
no increase in risks for having the EIS be dark.
Leave the engine settings alone and guess what?
They'll be the same when you bring the main bus
back up for approach to landing.
This discussion highlights the reason way we changed
the E-bus from "essential" to "endurance" some years
back. Essential goodies are those necessary to
get you back on the ground under present conditions.
Way back when, if your Narco VT-1 Super-Homer went
TU just before you intended to shoot a LOC approach,
your plan-B called for an airport in VMC . . . unless
you were really "uptown" with two VOR/LOC radios.
The point is that critical equipment be (1) backed
up with an independent substitute or (2) change
of flight plans to work around criticality of that
piece of equipment.
Providing multiple power sources in an already
failure tolerant architecture assumes that the
highest risk of failure is loss of power. Lots
of band-aid on top of band-aid while assuming
that the system itself is impervious to all other
failures.
Bob . . .
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Subject: | Re: Which Diode part number to use for dual power feed? |
After considering your points I simplified and stayed with the Z10/8.
My EIS4000 is on the Endurance bus along with my dual EFIS/AHRS. I'll flip the
EBus Alternate feed on prior to engine start, eliminating the brown out potential,
which will give the AHRS time to align prior to shaking the airplane around
with engine start....and have my EIS on line to show oil pressure right after
engine start.
I've attached my latest architecture version. If anyone sees an error in wiring,
please let me know. I'm learning tons here and greatly appreciate your inputs.
Thank-you.
Howard
--------
Howard Plevyak
GlaStar / North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=336722#336722
Attachments:
http://forums.matronics.com//files/printable_electric_glastar_w_dual_lightspeeds_architecture_v04_12apr2011_952.pdf
http://forums.matronics.com//files/electric_glastar_w_dual_lightspeeds_architecture_v04_12apr2011_108.pdf
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Subject: | Autocad on the web |
I just found this link for autocad that allows you to store and edit .dwg files:
https://www.autocadws.com/
Can one of you knowledgeable cad folks take a look and see if it is worth it for
casual use? It is a free service from AutoCad.
--------
RV4 - Purchased flying
RV-9A - soon
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=336756#336756
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Subject: | Re: Autocad on the web |
I took a quick look at it. I use AutoCAD at work and this seems to be
pretty much the same thing functionally.
It runs in a browser using Flash and is not as responsive as the copy of
AutoCAD on my desktop, but it does seem to work. I suppose it depends
on your internet connection speed.
It is certainly a whole lot cheaper than buying AutoCAD if you already
know how to use AutoCAD.
If you don't know AutoCAD, then I am not sure I would recommend this as
opposed to buying or downloading one of the inexpensive (or free) CAD
packages out there. If one is going to learn how to use a CAD package I
would certainly want to have it on my desktop.
If you need to do a quick drawing and know what you are doing, then this
is certainly a quick solution.
Dick Tasker
JohnInReno wrote:
> --> AeroElectric-List message posted by: "JohnInReno"<john@morgensen.com>
>
> I just found this link for autocad that allows you to store and edit .dwg files:
>
> https://www.autocadws.com/
>
> Can one of you knowledgeable cad folks take a look and see if it is worth it
for casual use? It is a free service from AutoCad.
>
> --------
> RV4 - Purchased flying
> RV-9A - soon
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=336756#336756
>
>
>
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Subject: | Re: Autocad on the web |
>
>If you need to do a quick drawing and know what you are doing, then
>this is certainly a quick solution.
>
>Dick Tasker
Agree on all points . . .
I fiddled with it a bit and became quickly frustrated with
the latencies associated with remotely accessed applications.
We've go 3meg down/.7meg up connectivity here.
For somebody starting out to learn a cad system,
there are some much faster ways to go for $50 down
to even free. TurboCAD opens, edits, prints and saves
all the AutoCAD files on the 'Connection website.
You can get where you want to go MUCH faster by modifying
an existing drawing than starting from scratch.
Bob . . .
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Subject: | Re: coil tuning anyone? |
>If you have any suggestions on
>what might make the following project work better, I'm all ears.
>http://www.easytreasure.co.uk/bfo.htm
I just reviewed this schematic again with some
attention to the audio section . . . the
thing has serious design flaws. We were
focused on the oscillators and I didn't really
do any kind of sanity check on the rest of it.
The guy who designed this obviously had little
knowledge of how to build stable, multi-stage
amplifiers from transistors.
You may be trying to build and troubleshoot
a circuit that is crippled right out of the
gate.
Bob . . .
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