Today's Message Index:
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1. 01:20 AM - Re: Safe Wire Types (jhausch)
2. 01:36 PM - Faulty troubleshooting (user9253)
3. 08:15 PM - Re: HUD for GA aircraft (Deems Herring)
Message 1
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| Subject: | Re: Safe Wire Types |
THis has been very informative. Thanks to all who have replied. I expected folks
to say Tefzel was AOK, but did not expect to see good comments about PVC.
Again, thanks. very interesting to read (and learn)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380258#380258
Message 2
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| Subject: | Faulty troubleshooting |
I had recently commented about erroneous troubleshooting techniques.
Then I made the same mistake myself. While working on an aviation project in my
workshop, I had wires temporarily connected with dabs of solder or alligator
clips. Then everything quit working. I tested the 5 VDC bus and it measured
12 volts! Oh no, I thought the 7805 voltage regulator shorted out and ruined
my expensive 5-volt components with 12 volts. I removed the 7805 voltage regulator
from the circuit board and tested it. There was nothing wrong with it.
So I soldered it back in place and turned the power on. This time everything
worked fine. Hmm, why weren't the 5-volt parts fried when 12 volts were applied?
And where did that 12 volts come from? I checked the PC Board traces for
solder bridges, but there were none.
Later I realized what must have happened. The negative power supply wire to
the circuit board must have had a bad connection. So the board was not even powered
up. No wonder nothing worked. So why did my digital volt meter measure
12 volts on the 5-volt bus? Because the meter has high input impedance, it
was able to measure the minute voltage leaking through the 7805 voltage regulator.
By the way, the voltmeter common lead was connected to the negative supply
upstream of the bad connection. This situation is very similar to the diode
test that Eric Jones described with a battery and diode and voltmeter all connected
in series.
Joe
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Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=380330#380330
Message 3
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| Subject: | HUD for GA aircraft |
This: http://www.virtualhud.com/VirtualHud/VirtualHUD.aspx might be better
for single engine tractor planes.
Deems
From: peter@sportingaero.com
Subject: Re: AeroElectric-List: HUD for GA aircraft
The big deal about HUDs is that they are focused at infinity with
some fancy (heavy) optics. That way you look out the window and
everything is in focus=2C
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