Today's Message Index:
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0. 12:33 AM - November List Fund Raiser (Matt Dralle)
1. 05:15 AM - Re: Relays etc (gordonrsmith921@yahoo.com)
2. 05:28 AM - Re: GPS multiple feeds - how many? (Bill Mauledriver Watson)
3. 08:19 AM - Re: Re: p-lead signal conditioning or tach gen usage (Robert L. Nuckolls, III)
4. 08:25 AM - Re: Re: Relays etc (Robert L. Nuckolls, III)
5. 10:11 AM - What is the SD-8's regulator doing when not being used (David E. Nelson)
6. 11:04 AM - Re: What is the SD-8's regulator doing when not being used (Etienne Phillips)
7. 12:29 PM - Re: What is the SD-8's regulator doing when not being used (Robert L. Nuckolls, III)
8. 05:15 PM - Re: What is the SD-8's regulator doing when not being used (David Nelson)
9. 06:16 PM - Re: p-lead signal conditioning or tach gen usage (Craig Winkelmann)
10. 06:20 PM - Re: p-lead signal conditioning or tach gen usage (Craig Winkelmann)
11. 06:56 PM - Jabiru regulator wiring and 2nd ground (messydeer)
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Subject: | November List Fund Raiser |
A couple of years ago I implemented an automatic "squelch button" of sorts for
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Message 1
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Att'n: 'Lectric Bob:
You mentioned ". . . solid state relays even better."
I recall some time ago that you mentioned that you might design, build, market
solid state relays. Is that still a possibility for the future?
Gordon smith
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270760#270760
Message 2
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Subject: | Re: GPS multiple feeds - how many? |
I have a 396 (not in the '10) and all those other components but I can't
answer your question.
It occurs to me that a cost effective solution may be to simply add a
$150 external GPS from GRT. It can drive at least the EFIS and the AP.
And it would be permanently mounted like the EFIS and TT though I'm
sure you are planning to 'permanently' mount the 396.
Bill "just finishing up the panel and going back to fiberglass" Watson
RV10 40605
Phil White wrote:
>
> I am building an RV-10, and beginning to assemble and wire a panel.
> My main GPS is a Garmin 396. I need it to feed my GRT EFIS, a
> Tru-Trak autopilot, and a 406 MHz ELT. Will I have any problems with
> impedance matching, or signal degradation if all 3 are fed from the
> GPS directly? I don't know the input impedances of any of these fed
> boxes, or what sort of power the Garmin can generate on its RS-232 feed.
> I read the 2007 post about using a DB25 connector to facilitate the
> multiple connections, but wonder if one needs a buffer or amplifier of
> any sort to handle 3 outputs from one.
> Phil in IL
>
>
Message 3
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Subject: | Re: p-lead signal conditioning or tach gen usage |
At 04:18 PM 11/2/2009, you wrote:
><capav8r@gmail.com>
>
>Bob:
>
>I can eliminate the comparator circuit if I get the output of the
>squaring circuit to 5 VDC (TTL level). My thought is to use a Texas
>Instrument UA7805 Positive Voltage Regulator and connect it to an
>available 12VDC source in the aircraft. This should give me a
>stable 5.0 voltage source. At 5.0 VDC, the prior squaring circuit
>diagram used a 4.7K resistor on the collector to limit the current
>when the transistor is off. This should square off the signal and
>provide a TTL level input to the EFIS system in the aircraft.
>
>I can build this on a breadboard and test it in the lab and use a
>variable speed power drill to rotate the tach gen.
>
>If the above sounds reasonable, I'm off to order the parts from
>DigiKey. Thanks for all the help and advice.
Okay, how about this?
Emacs!
How "square" does the signal need to be? If you're driving the
"off the shelf" input to some tachometer originally designed to
attach to a p-lead or some other transducer, the tach should
take care of its own "squaring" internally. It may be that all
you need is to "clean" up the waveform to eliminate bumps and
warts on transitions that can be interpreted as "extra
edges".
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 4
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At 07:12 AM 11/3/2009, you wrote:
><gordonrsmith921@yahoo.com>
>
>Att'n: 'Lectric Bob:
>You mentioned ". . . solid state relays even better."
>I recall some time ago that you mentioned that you might design,
>build, market solid state relays. Is that still a possibility for the future?
>Gordon smith
Absolutely. That design is done and tooled. At
the moment, I don't have a production facility
free. We're still knee deep in house remodeling
and shuffling of furniture between four locations.
The goal now is to have the kids in my Wichita
house over the Thanksgiving week. Give them a
few weeks to get "settled in" and I'll be training
them to take over the AeroElectric Connection
production and order fulfillment.
That will let me spend 100% of my time on development
of about a dozen new products. Here's the preliminary
data on a solid state relay.
http://www.aeroelectric.com/Catalog/AEC/9030/
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 5
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Subject: | What is the SD-8's regulator doing when not being used |
Hi Bob,
With the plane in a cruise configuration and 'Aux Alt' switch 'Off', is the
regulator sinking all the power that the SD-8 is producing?
Thanks,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
Message 6
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Subject: | Re: What is the SD-8's regulator doing when not being |
used
Hi /\/elson
Since there's no current flowing through the regulator, my guess is
that it's not doing anything... Converting the open-circuit voltage of
the SD-8 to 13.8V (or whatever yours is set to) doesn't dissipate any
energy until the current starts to flow.
Etienne
On 03 Nov 2009, at 7:40 PM, David E. Nelson wrote:
> >
>
>
> Hi Bob,
>
> With the plane in a cruise configuration and 'Aux Alt' switch 'Off',
> is the regulator sinking all the power that the SD-8 is producing?
>
> Thanks,
> /\/elson
>
> ~~ Lately my memory seems to be like a steel trap .... without any
> spring. ~~
>
>
Message 7
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Subject: | Re: What is the SD-8's regulator doing when not being |
used
At 12:29 PM 11/3/2009, you wrote:
><etienne.phillips@gmail.com>
>
>Hi /\/elson
>
>Since there's no current flowing through the regulator, my guess is
>that it's not doing anything... Converting the open-circuit voltage of
>the SD-8 to 13.8V (or whatever yours is set to) doesn't dissipate any
>energy until the current starts to flow.
>
>Etienne
Correct.
Bob . . .
---------------------------------------
( It's MATRONICS FUND RAISER MONTH! )
( Do your part to keep this marvelous )
( tool sharp and available to all our )
( brothers in the OBAM aviation )
( community. )
---------------------------------------
Message 8
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Subject: | Re: What is the SD-8's regulator doing when not being |
used
Thank you.
/\/elson
On Tue, 3 Nov 2009, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 12:29 PM 11/3/2009, you wrote:
>> <etienne.phillips@gmail.com>
>>
>> Hi /\/elson
>>
>> Since there's no current flowing through the regulator, my guess is
>> that it's not doing anything... Converting the open-circuit voltage of
>> the SD-8 to 13.8V (or whatever yours is set to) doesn't dissipate any
>> energy until the current starts to flow.
>>
>> Etienne
>
> Correct.
>
>
> Bob . . .
>
> ---------------------------------------
> ( It's MATRONICS FUND RAISER MONTH! )
> ( Do your part to keep this marvelous )
> ( tool sharp and available to all our )
> ( brothers in the OBAM aviation )
> ( community. )
> ---------------------------------------
>
>
Message 9
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Subject: | Re: p-lead signal conditioning or tach gen usage |
Bob:
In that case, I'll just run the output into the comparator circuit as the signal
input to the comparator goes to this:
signal in O-------
|
>
|
O---------O------> to comparator
| |
> ---
50K |
| |
gnd gnd
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270874#270874
Message 10
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Subject: | Re: p-lead signal conditioning or tach gen usage |
Bob:
Well that got messed up when it posted! Basically, signal in goes to a voltage
divider of 1K resistor and 50K resistor with a 5.1V Zener in parallel with the
50K resistor. The output goes to the comparator. Output of the comparator
goes to the EFIS as a TTL level signal.
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270875#270875
Message 11
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Subject: | Jabiru regulator wiring and 2nd ground |
Hi!
I am mounting my filter capacitor and alt disconnect relay on the cool side of
the firewall. Voltage regulator and battery would be FWF. One alternator lead
would go through the firewall to the COM terminal of the alt disconnect relay.
From the regulator, one ltblu wire, the red wire, and the yel wire would go
through the firewall to the filter capacitor. From the filter capacitor, there
would be one wire come back through the firewall to the starter contactor. This
is how I'd planned it a few months ago. The only changes were to downsize the
wires.
But today, I ran across the following on the US Jabiru website:
We suggest keeping the red and yellow wires ahead of the firewall. We run them
directly but separately to the battery.
This differs from how I have it, since my red and yellow wires are not kept fwf.
And they are not run directly to the battery, but go first to the filter capacitor,
starter contactor, battery contactor and then to the battery. Is there
any problem doing it how I have it?
I also noticed in the Z drawings with the Jabiru regulator, Bob shows two grounds,
one from the black wire and another drawn between the voltage regulator box
to the firewall. I'm wondering if this ground drawing should be deleted. The
voltage regulator metal case certainly contacts the firewall, fwiw.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=270882#270882
Attachments:
http://forums.matronics.com//files/dans_jab_3300_alternator_and_regulator_wiring_505.pdf
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