Today's Message Index:
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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
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Subject: | Re: Low Voltage Annunciator |
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
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Subject: | 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
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Subject: | 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
>
>
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