---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 08/07/12: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 01:20:54 AM PST US Subject: AeroElectric-List: Re: Safe Wire Types From: "jhausch" 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 _____________________________________ Time: 01:36:51 PM PST US Subject: AeroElectric-List: Faulty troubleshooting From: "user9253" 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 -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=380330#380330 ________________________________ Message 3 _____________________________________ Time: 08:15:09 PM PST US From: Deems Herring Subject: RE: AeroElectric-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.