---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 12/23/15: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:57 AM - Re: Low Voltage Annunciator (racerjerry) 2. 07:48 AM - Re: Re: Oscilloscope for Android Phone (Sam Marlow) 3. 08:03 AM - Re: Re: Oscilloscope for Android Phone (Sam Marlow) ________________________________ Message 1 _____________________________________ Time: 05:57:03 AM PST US Subject: AeroElectric-List: Re: Low Voltage Annunciator From: "racerjerry" I can tell you that the Eric Jones 13V Idiot Light has saved my bacon quite a few times - or at least has saved me from dangerous hand-propping by reminding me to turn the master switch OFF. For $50 you can't get a better low voltage warning indicator - no construction required. As long as you do not hardwire or permanently mount Eric's ingenious little device, it is even legal to install it on a certified aircraft. The light also has an extra wire to connect to an optional audio alarm or panel annunciator. I fabricated a mount for the low voltage warning light module from a 3/4 x 1/16 x 2 inch long aluminum angle (aircraft aisle of home stores) and Velcro mounted it to the top of my glare shield; with the light aimed directly at me but offset to the co-pilot side. The warning light is installed in My Cessna 172K and powered from the cigarette lighter receptacle; providing me with a perfectly legal (nothing permanently attached to airframe) and very valuable low voltage warning as well as alerting me should I ever forget to turn the master switch off at shutdown another warning indication that I had long desired. On later Cessnas, I believe that this second function is indirectly achieved through their over-voltage warning light; however my 1969 (& earlier) does not have an over-voltage sensor. http://periheliondesign.com/moreproductsfiles/LV_Annunciator%20Manual.pdf Please note that I have no connection to Mr. Eric M. Jones or his company www.PerihelionDesign.com other than being a very satisfied customer. -------- Jerry King Read this topic online here: http://forums.matronics.com/viewtopic.php?p=451375#451375 ________________________________ Message 2 _____________________________________ Time: 07:48:12 AM PST US From: Sam Marlow Subject: Re: AeroElectric-List: Re: Oscilloscope for Android Phone Thanks! rampil wrote: > > Look at something like this: > > http://www.amazon.com/gp/product/B004KKTUV6/ref=pd_lpo_sbs_dp_ss_2?pf_rd_p=1944687542&pf_rd_s=lpo-top-stripe-1&pf_rd_t 1&pf_rd_i=B00BY8LVCS&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0XBWZ07S1VW2QD6H2E6M > > a purpose built o-scope is much more likely to solve you problem than > an outrigger box for a phone > > -------- > Ira N224XS > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=451089#451089 > > ________________________________ Message 3 _____________________________________ Time: 08:03:12 AM PST US From: Sam Marlow Subject: Re: AeroElectric-List: Re: Oscilloscope for Android Phone I tracked it down to a bad alternator, by the old, switch parts until you find it! Not ideal, but it worked...... Thanks! rampil wrote: > > Hi All, > > Im not sure what signals Sam is looking for with his desire for an > oscilloscope. There is no description of the interference with his EFIS > and autopilot. Without some detailed sort of characterization of the > symptoms you can't even guess what bandwidth you might need in a scope > to track down the noise. Is it audio range, power inverter range, RF, etc? > > The android apps mentioned by Jetboy seen to be spectrum analyzers for > audio range only, so far as I can tell, not oscilloscope apps. > > Sam: what wires are you planning to look at with a scope? Power? > Digital I/O lines, analog I/O? If you are thinking about splicing a headset > cord on to a avionics power line, remember that 12 V will smoke an Android. > Real scopes generally have voltage divider probes and and are usually > tolerant of much wider voltage ranges to start with. > > -------- > Ira N224XS > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=451285#451285 > > ------------------------------------------------------------------------------------- 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.