Today's Message Index:
----------------------
1. 12:24 PM - Re: TSU'd Usb charger?? (Dj Merrill)
2. 12:49 PM - Re: TSU'd Usb charger?? (Tim Olson)
3. 12:53 PM - fuel gage/sender compatability (ashleysc@broadstripe.net)
4. 01:01 PM - Re: TSU'd Usb charger?? (Rene)
5. 01:13 PM - Re: TSU'd Usb charger?? (Tim Olson)
6. 01:49 PM - Re: Re: Interesting thread on overvoltage event (Jan de Jong)
7. 04:04 PM - Re: fuel gage/sender compatability (Robert L. Nuckolls, III)
8. 05:16 PM - Mitchell fuel gauge. (Tim Yoder)
9. 06:05 PM - Re: Mitchell fuel gauge. (Robert L. Nuckolls, III)
10. 06:53 PM - Re: fuel gage/sender compatability (ashleysc@broadstripe.net)
Message 1
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| Subject: | Re: TSU'd Usb charger?? |
I've been using this one in the plane and I haven't noticed any
interference:
https://www.amazon.com/gp/product/B00E1UWA4O/
-Dj
--
Dj Merrill - N1JOV - EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - https://deej.net/sportsman/
Glastar Flyer N866RH - https://deej.net/glastar/
Message 2
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| Subject: | Re: TSU'd Usb charger?? |
I use the exact same thing...SCOSCHE USBC242M, 12 Watts per port (2.4A)
4.8A total.
In fact, I probably own about 10 of them with the 2 that were delivered
to my house today. I've been using them in both of my aircraft now
for at least a couple years with no interference.
I don't think I'd buy TSO'd for anything, given that installing
a simple lighter/Aux jack is cheap and simple and technology
changes so fast. Why spend a couple hundred on a TSO'd box
that will probably be obsolete in 3 years anyway. My new
audio panels use USB-C ports, and I'm sure within a couple
years many other devices will be using USB-C too. Easier to
just buy a few new chargers to pop back in the jack.
I've said the same thing to people who when building their
plane put DVD players in the panel and headrest monitors
in the seats. 2 years after it was installed, nobody used
DVD anymore. Now you just load the movie on your ipad.
Tim
On 4/27/2017 2:22 PM, Dj Merrill wrote:
>
> I've been using this one in the plane and I haven't noticed any
> interference:
>
> https://www.amazon.com/gp/product/B00E1UWA4O/
>
> -Dj
>
Message 3
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| Subject: | fuel gage/sender compatability |
Calling all Electronics Wizards;
I have a fuel sender installed in each wing that ranges from 10 ohms full to 73
ohms empty. These are hard to get to, and I don't want to change them out unless
necessary. I have a dual fuel gauge capable of reading the fuel depth in two
tanks. It wants 40 ohms full and 240 ohms empty. Is there some type of "resistance
multiplier circuit that I could install between sender and gauge so that
they can be used together?
Cheers! Stu.
Message 4
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| Subject: | TSU'd Usb charger?? |
Tim, quit talking about me. BTW, anybody what some PSengineering video
screens? Hate to just throw them out....but nobody on e-bay wanted them.
Rene'
801-721-6080
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Tim Olson
Sent: Thursday, April 27, 2017 1:48 PM
Subject: Re: AeroElectric-List: TSU'd Usb charger??
I use the exact same thing...SCOSCHE USBC242M, 12 Watts per port (2.4A) 4.8A
total.
In fact, I probably own about 10 of them with the 2 that were delivered to
my house today. I've been using them in both of my aircraft now for at
least a couple years with no interference.
I don't think I'd buy TSO'd for anything, given that installing a simple
lighter/Aux jack is cheap and simple and technology changes so fast. Why
spend a couple hundred on a TSO'd box that will probably be obsolete in 3
years anyway. My new audio panels use USB-C ports, and I'm sure within a
couple years many other devices will be using USB-C too. Easier to just buy
a few new chargers to pop back in the jack.
I've said the same thing to people who when building their plane put DVD
players in the panel and headrest monitors in the seats. 2 years after it
was installed, nobody used DVD anymore. Now you just load the movie on your
ipad.
Tim
On 4/27/2017 2:22 PM, Dj Merrill wrote:
>
> I've been using this one in the plane and I haven't noticed any
> interference:
>
> https://www.amazon.com/gp/product/B00E1UWA4O/
>
> -Dj
>
Message 5
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| Subject: | Re: TSU'd Usb charger?? |
HA, funny Rene', I didn't even know that you did that too. :)
I know there were quite a few though.
If it's an avionics item, it's probably good for a few years.
But if it's consumer goods, well, now you know. :)
Tim
On 04/27/2017 02:59 PM, Rene wrote:
>
> Tim, quit talking about me. BTW, anybody what some PSengineering video
> screens? Hate to just throw them out....but nobody on e-bay wanted them.
>
> Rene'
> 801-721-6080
>
Message 6
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| Subject: | Re: Interesting thread on overvoltage event |
Bob, thanks a lot for the little experiment.
No descending into weeds necessary then.
Jan de Jong
> In the mean time, I subjected a fully charged ETX36 lithium battery to a 40v,
15A constant current source.
>
> Didn't take time to record and plot the data but my suspicions were correct,
these batteries WILL grunt some level of over-charge current.
>
> In this experiment, it took several seconds for battery voltage to rise above
16.0 volts. Risks to accessories in an airplane fitted with a PM (read small)
alternator and legacy ov protection (16.2v) are small. Indeed, if the system
loads are a significant fraction of the alternators maximum output, one might
well never trip a legacy ov protection system.
Message 7
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| Subject: | Re: fuel gage/sender compatability |
At 02:52 PM 4/27/2017, you wrote:
>
>
>Calling all Electronics Wizards;
>I have a fuel sender installed in each wing that ranges from 10 ohms
>full to 73 ohms empty. These are hard to get to, and I don't want to
>change them out unless necessary. I have a dual fuel gauge capable
>of reading the fuel depth in two tanks. It wants 40 ohms full and
>240 ohms empty. Is there some type of "resistance multiplier circuit
>that I could install between sender and gauge so that they can be
>used together?
>Cheers! Stu.
Yeah . . . sort of. It's called an 'operational
amplifier'. A versatile device that can 'watch'
your 10/73 transducer and convert it into
a VOLTAGE that mimics the voltages expected across
the 40/240 transducer when wired to the mated
instrument.
What we need is a measure of the transducer
bias current that comes out of the instrument when
terminated with a 40 ohm resistor, and then with
a 240 ohm resistor.
Knowing those values will allow us to calculate the
resistors that tell the op-amp how to apply its
magic. This technique will set the 'endpoints'
for the instrument . . . calibration at empty
and full. Accuracy of the readings between
these values will have to be deduced by filling
the tanks with the ship in a pitch attitude
consistent with level flight.
However, even without calibration, they'll be
sufficiently accurate to run your pucker factor
up as the needles drop below 1/4 full.
Bob . . .
Message 8
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| Subject: | Mitchell fuel gauge. |
I have a Mitchell fuel gauge that read 0-15 lbs and I need it to read 0-7
lbs. My fuel pressure is 3/4 to 3 lbs. Is there a way to to make the gauge
indicate half of the value across the 0-15 scale? Mitchell doesn't sell a
0-7 lb gauge.
Thanks for any help.
Message 9
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| Subject: | Re: Mitchell fuel gauge. |
At 07:15 PM 4/27/2017, you wrote:
>I have a Mitchell fuel gauge that read 0-15 lbs and I need it to
>read 0-7 lbs. My fuel pressure is 3/4 to 3 lbs. Is there a way to to
>make the gauge indicate half of the value across the 0-15 scale?
>Mitchell doesn't sell a 0-7 lb gauge.
>Thanks for any help.
I presume you're talking about gage with
and electronic transducer at the engine
and a 'specialized' meter at the panel.
It's not difficult to re-scale some instruments
and tailor them to other signal sources.
Here's a loadmeter I used to sell that was
made from a generic, 1 milliamp DC instrument.
http://www.aeroelectric.com/Catalog/AEC/9007/9007-120-1_Loadmet
These were easy to take apart, glue new scale
placards onto the existing plate, paint the
pointer and put it back together.
Then I tailored matching shunts for any value
of 100% from 10 to 100Amps.
Your task depends on what kind of transducer/
meter configuration you have. It MIGHT be
so simple as to reduce the value of a calibration
resistor such that the instrument reads 2x real
pressure.
If I were starting from scratch, I'd get a transducer
like this
http://tinyurl.com/m2noxox
and fit one of the meters like I showed above with
a 0-5 psi scale plate. Then, a handful of jelly
bean components would provide 5v regulated to
power the instrument and set scale-factor +
offset to match the transducer. Your Mitchell
hardware MIGHT be so adaptable but I
can't offer more concrete information without
having the parts on the bench to see how they
dance with each other.
Maybe someone on the List has dug into Mitchell's
electro-magic . . .
Bob . . .
Message 10
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| Subject: | Re: fuel gage/sender compatability |
Hi Bob;
Thanks for your help. I will get 40 and 240 ohm resistors, make the test, and get
back to you with the results via this mode.
Cheers! Stu.
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Thursday, April 27, 2017 4:03:16 PM
Subject: Re: AeroElectric-List: fuel gage/sender compatability
At 02:52 PM 4/27/2017, you wrote:
Calling all Electronics Wizards;
I have a fuel sender installed in each wing that ranges from 10 ohms full to 73
ohms empty. These are hard to get to, and I don't want to change them out unless
necessary. I have a dual fuel gauge capable of reading the fuel depth in two
tanks. It wants 40 ohms full and 240 ohms empty. Is there some type of "resistance
multiplier circuit that I could install between sender and gauge so that
they can be used together?
Cheers! Stu.
Yeah . . . sort of. It's called an 'operational
amplifier'. A versatile device that can 'watch'
your 10/73 transducer and convert it into
a VOLTAGE that mimics the voltages expected across
the 40/240 transducer when wired to the mated
instrument.
What we need is a measure of the transducer
bias current that comes out of the instrument when
terminated with a 40 ohm resistor, and then with
a 240 ohm resistor.
Knowing those values will allow us to calculate the
resistors that tell the op-amp how to apply its
magic. This technique will set the 'endpoints'
for the instrument . . . calibration at empty
and full. Accuracy of the readings between
these values will have to be deduced by filling
the tanks with the ship in a pitch attitude
consistent with level flight.
However, even without calibration, they'll be
sufficiently accurate to run your pucker factor
up as the needles drop below 1/4 full.
Bob . . .
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