Today's Message Index:
----------------------
1. 05:17 AM - Nav Audio Connection (Harold Lanfear)
2. 06:21 AM - Re: Z-12 Power Grid Behavior (user9253)
3. 06:36 AM - Re: Surface temperature sensor (user9253)
4. 07:02 AM - Re: Re: Designing a circuit question (Robert L. Nuckolls, III)
5. 07:14 AM - Re: Nav Audio Connection (Robert L. Nuckolls, III)
6. 08:27 AM - diode to relay (Chris Hukill)
7. 10:48 AM - Re: Nav Audio Connection (Stein Bruch)
8. 10:48 AM - Re: Re: Surface temperature sensor (J. Mcculley)
9. 04:51 PM - Re: diode to relay (Robert L. Nuckolls, III)
10. 06:03 PM - Re: Designing a circuit (Dennis & Anne Glaeser)
Message 1
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| Subject: | Nav Audio Connection |
I'm currently wiring the audio portion of my Garmin 430W into the
intercom. The company that did the harness simply labeled this wire as
"Nav Audio, for future use" When I traced the pinouts, I discovered
this wire to be the VOR / ILS Audio Hi & Lo wires. Can I connect these
to the same pins as the Com Audio without a problem?
I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs from my
Grand Rapids EIS and some warning systems so I could use this for the
Nav input as well, if that would be better.
Thanks for the help in advance.
Harold Lanfear
Message 2
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| Subject: | Re: Z-12 Power Grid Behavior |
> One can normally fly with E-Bus feed switch ON
Doing so will not hurt anything.
> since an alternator energized Main Bus is at a higher voltage than the battery
and it will feed the E-Bus thru the diode when operating.
Not true. The Main Bus and battery will be at essentially at the same voltage.
The diode will NOT conduct with the E-Bus switch closed because the diode has
been shorted out by the parallel current path through the E-Bus switch.
> So even if both alternators fail and battery contactor failed the E-Bus will
receive battery power without any action required from the pilot.
That is true as long as the E-Bus switch is closed.
> the Battery Contactor Relay is opened, isolating the battery from the Main Bus,
while either alternator is operating, the alternator will continue to provide
good power to the Main Bus and E-Bus without the battery in the circuit.
Probably, but not certain. It all depends on the components used.
> will there be any power quality or stability issues with the electrical system
without the battery in the circuit?
I do not think so, but am not sure.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295621#295621
Message 3
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| Subject: | Re: Surface temperature sensor |
Jim McCulley,
Good job making an economical and accurate multi-point temperature sensor and indicator.
I admire your ingenuity and resourcefulness.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295622#295622
Message 4
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| Subject: | RE: Designing a circuit question |
At 04:39 PM 4/24/2010, you wrote:
> > I'm fiddling with a variant of the circuit I
> > published to convert it to a solid state breaker
> > instead of current limiter.
> > I'll see if I can publish that variant tomorro evening.
> >
> > Bob . . .
>
>Hi Bob,
>
> If you are still working on this solid state design you talked
> about, I was wondering if it would be possible to incorporate a
> feature that allows the user to set for different loads.
> In other words, a 2amp setting, a 3 amp setting, etc,
> etc..........or did you intend on this, anyway?
>
> I'm really looking forward to what you come up with. I
> definitely plan on building it!!
Thanks! There is no greater validation of
an recipe for success than multiple experiences
by multiple chefs in their own kitchens.
I suspect there are some other folks on the list
who might have some ideas about how to synthesize
all silicon circuit breaker.
Getting it to trip at the right current isn't hard.
What we need to keep in mind about thermal circuit
breakers is their I(squared)*R tripping dynamic
that gives them some degree of immunity to inrush
tripping.
In the design study before us, we're dealing with
a PM DC motor that has a significant inrush
characteristic. so what we'll want to do for THIS
case is design a 'breaker' that is also a current
limiter but with some form of trip-delay . . . say
something on the order of 200 milliseconds.
I'm mulling over several ideas for minimizing
parts count while meeting design goals. Any
electron herders out there want to swap ideas?
Bob . . .
Message 5
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| Subject: | Re: Nav Audio Connection |
At 07:11 AM 4/25/2010, you wrote:
>I'm currently wiring the audio portion of my Garmin 430W into the
>intercom. The company that did the harness simply labeled this wire
>as "Nav Audio, for future use" When I traced the pinouts, I
>discovered this wire to be the VOR / ILS Audio Hi & Lo wires. Can I
>connect these to the same pins as the Com Audio without a problem?
Yes. LO = ground, HI = nav audio source
>
>I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs
>from my Grand Rapids EIS and some warning systems so I could use
>this for the Nav input as well, if that would be better.
Normally one would gather all audio sources together into
a single mixer . . . so yes, that would be preferre.
Bob . . .
Message 6
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I am wiring my RV10 with an avionics bus relay. I will activate the
relay by switching the ground. I want to power the "activate power" lead
with both the main bus and the avionics bus, as to allow a back door to
the main bus thru the avionics bus, via the alternate ebus feed in the
event of a failed master relay, in-flight. I need to know the rating and
source for the diodes on the activate power leads. The small 50amp Bosch
relay only draws .1 amp to close.
Chris Hukill
Message 7
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| Subject: | Nav Audio Connection |
Hi Harold,
Not really a good idea to hook those together as they are meant for a
separate channel on either the mixer or audio panel/intercom so you can shut
the "ident" stream off when no desired. The LOW isn't that big of a deal
(Low mostly = ground).
Cheers,
Stein
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Harold
Lanfear
Sent: Sunday, April 25, 2010 7:12 AM
Subject: AeroElectric-List: Nav Audio Connection
I'm currently wiring the audio portion of my Garmin 430W into the intercom.
The company that did the harness simply labeled this wire as "Nav Audio, for
future use" When I traced the pinouts, I discovered this wire to be the VOR
/ ILS Audio Hi & Lo wires. Can I connect these to the same pins as the Com
Audio without a problem?
I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs from my
Grand Rapids EIS and some warning systems so I could use this for the Nav
input as well, if that would be better.
Thanks for the help in advance.
Harold Lanfear
Message 8
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| Subject: | Re: Surface temperature sensor |
Thanks, Joe, for the compliment! Hope you find the concept useful for
your purposes.
Jim
============================================================================================
user9253 wrote:
>
> Jim McCulley,
> Good job making an economical and accurate multi-point temperature sensor and
indicator. I admire your ingenuity and resourcefulness.
> Joe
>
> --------
> Joe Gores
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=295622#295622
>
>
>
>
>
>
>
>
>
>
>
Message 9
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| Subject: | Re: diode to relay |
At 10:20 AM 4/25/2010, you wrote:
>I am wiring my RV10 with an avionics bus relay. I will activate the
>relay by switching the ground. I want to power the "activate power"
>lead with both the main bus and the avionics bus, as to allow a back
>door to the main bus thru the avionics bus, via the alternate ebus
>feed in the event of a failed master relay, in-flight. I need to
>know the rating and source for the diodes on the activate power
>leads. The small 50amp Bosch relay only draws .1 amp to close.
The coil spike suppression diodes are
the least critical application you'll need
to address. Any current rating at any voltage
you can find is electrically adequate to
the task. However, 1N400x or 1N540x series
devices are suggested as MECHANICALLY robust
and relatively easy to find. Take your pick
of these Radio Shack parts.
http://aeroelectric.com/Pictures/Misc/RS_Diodes.jpg
Bob . . .
Message 10
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| Subject: | Re: Designing a circuit |
Joe Gores not only suggested using a reed switch to sense my prop end of
travel, he even gave me one to try! Today I went out and played a bit. I
found that 3 winds of 18AWG causes the switch to close just as the motor
starts to strain against the stop. So I used a dab of Goop to mate the wire
loops to the reed switch and used a piece of nylon tubing as a container.
I'm attaching a picture, but don't remember if those get through on this
list. Doing this was a lot easier than I had imagined. It work great on
the ground, but the weather here in MI was low IFR all day so no flight
testing.
I've already ordered the parts for the circuit Bob designed, so I'll be
playing with that soon as well. I'll be able to have both methods operating
in parallel.
Thanks guys!
Dennis
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