Today's Message Index:
----------------------
1. 06:47 AM - Mechanics of adding resistors (MLWynn@aol.com)
2. 07:44 AM - Re: Mechanics of adding resistors (Robert L. Nuckolls, III)
3. 08:04 AM - Re: Mechanics of adding resistors (Christopher SeaStone)
4. 08:17 AM - Re: Diodes on Relays (Vern Little)
5. 01:00 PM - An icon and teacher of teachers has left us . . . (Robert L. Nuckolls, III)
6. 01:37 PM - Re: An icon and teacher of teachers has left us . . . (Richard Tasker)
7. 02:25 PM - Re: Mechanics of adding resistors (MLWynn@aol.com)
8. 03:12 PM - Re: An icon and teacher of teachers has left us . . . (Robert L. Nuckolls, III)
9. 04:17 PM - Re: Mechanics of adding resistors (Robert L. Nuckolls, III)
Message 1
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| Subject: | Mechanics of adding resistors |
Hi all,
I am wiring a Grand Rapids EIS 4000 into my RV 8. The unit has a 4.8V
"exciter" circuit. Two auxiliary inputs are for fuel tank sensors. I
understand from the wiring diagram here
_http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_s
M4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf_
(http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3Wb
vLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf)
that I wire a 470 ohm resistor between the 4.8V exciter circuit and the
wire to the fuel tank sensor. The other end of the fuel tank sensor goes to
ground.
Since there are two circuits, one to each fuel tank, I had thought to
solder or crimp the two resistors to the exciter wire and then strip a half inch
of the wire from the EIS unit to the fuel sensor. The ends of the
resistors would be soldered into the sensor wire and the joint covered in heat
shrink.
I began to wonder how much heat would be generated and if I need to protect
this from other wires. I wouldn't think there would be much heat since
there is little current in a sensor.
Can anyone shed some light on the mechanics of how I should set this up?
Regards
Michael Wynn
RV 8 Wiring
San Ramon, CA
Message 2
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| Subject: | Re: Mechanics of adding resistors |
At 08:41 AM 6/27/2011, you wrote:
Hi all,
I am wiring a Grand Rapids EIS 4000 into my RV 8. The unit has a
4.8V "exciter" circuit. Two auxiliary inputs are for fuel tank
sensors. I understand from the wiring diagram here
http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf
I tried to open that link but was not successful . . .
that I wire a 470 ohm resistor between the 4.8V exciter circuit and
the wire to the fuel tank sensor. The other end of the fuel tank
sensor goes to ground.
Since there are two circuits, one to each fuel tank, I had thought to
solder or crimp the two resistors to the exciter wire and then strip
a half inch of the wire from the EIS unit to the fuel sensor. The
ends of the resistors would be soldered into the sensor wire and the
joint covered in heat shrink.
Like this?
Emacs!
See: http://www.aeroelectric.com/articles/Homeless/Homeless_Components.htm
I began to wonder how much heat would be generated and if I need to
protect this from other wires. I wouldn't think there would be much
heat since there is little current in a sensor.
Correct. If there's a reason for selecting larger
than necessary for electrical performance, it's for
mechanical robustness. Consider 1/2 watt resistors
for this task.
Bob . . .
Message 3
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| Subject: | Re: Mechanics of adding resistors |
Hello Michael,
Just finished a similar install on a Dynon D180 and Rotax with multiple
resistors for current loop sensors. Choose a point in-line for the
resistors that you can mechanically support the wire bundle. Trim the
resistor leads to about 1/2" slip multiple layers of heat shrink tubing onto
the wires before assembly if unable to add heatshrink post assembly. I
soldered all connections. Heatshrink tubing over each resistor, then bundle
and larger heatshrink tubing. Be sure to extend the heatshrink tubing 1" or
further beyond the connection for mechanical support. The current the
resistors is limiting is in the 10s of milliamps range and thus almost no
power (heat) is dissapated.
Chris Stone
RV-8
Oregon
On Mon, Jun 27, 2011 at 6:41 AM, <MLWynn@aol.com> wrote:
> **
>
> Hi all,
>
> I am wiring a Grand Rapids EIS 4000 into my RV 8. The unit has a 4.8V
> "exciter" circuit. Two auxiliary inputs are for fuel tank sensors. I
> understand from the wiring diagram here
>
>
> http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf
>
> that I wire a 470 ohm resistor between the 4.8V exciter circuit and the
> wire to the fuel tank sensor. The other end of the fuel tank sensor goes to
> ground.
>
> Since there are two circuits, one to each fuel tank, I had thought to
> solder or crimp the two resistors to the exciter wire and then strip a half
> inch of the wire from the EIS unit to the fuel sensor. The ends of the
> resistors would be soldered into the sensor wire and the joint covered in
> heat shrink.
>
> I began to wonder how much heat would be generated and if I need to protect
> this from other wires. I wouldn't think there would be much heat since
> there is little current in a sensor.
>
> Can anyone shed some light on the mechanics of how I should set this up?
>
> Regards
>
> Michael Wynn
> RV 8 Wiring
> San Ramon, CA
>
>
> *
>
> *
>
>
Message 4
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| Subject: | Re: Diodes on Relays |
I=99ve successfully used these automotive types with built-in
supression (resistors):
http://search.digikey.com/scripts/dksearch/dksus.dll?Keywords=255-2161-
ND&site=US&WT.mc_id=tbr_srch&WT.mc_ev=click
Also available with diodes, but the resistor type is polarity
insensitive.
Vern
From: Robert L. Nuckolls, III
Sent: Sunday, June 26, 2011 10:21 PM
Subject: RE: AeroElectric-List: Diodes on Relays
At 08:57 PM 6/26/2011, you wrote:
Bevan;
MOST small relays are NOT polarity sensitive. For the most part, the
only ones that are, are the ones containing spike suppression diodes or
LED indicators. The relay coil itself doesn=C2=92t care about polarity.
The B&C relays are most likely generic basic relays without any sort
of diodes such as the ones linked to by John at the start of this
thread.
Correct. The only relay I used to sell that did
have the built in diode was a starter contactor . . .
and it was available either way. There was some
notation like 'coil suppression' stamped on the
bottom of the one with a diode.
I'm aware of no relays other than mil-spec devices
and a few 'upper crust' industrial relays that
commonly sport the built in suppression.
This one clearly does not . . .
While the schematic on the enclosure for this one shows
a diode and clear (+) mark for the coil polarity.
If the relay you have in hand DOES include coil
suppression, then it will be clearly marked as such
in some manner on the outside. Otherwise, relay
coils are not polarity sensitive.
Bob . . .
-------------------------------------------------------------------------
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Checked by AVG - www.avg.com
Message 5
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| Subject: | An icon and teacher of teachers has left us . . . |
See:
http://www.edn.com/article/print/518496-Analog_guru_Jim_Williams_dies_after_stroke.php
Would that we all achieve 1/10th of what this man has
accomplished both as a creator of new ideas and as
teacher of how those ideas work . . .
Bob . . .
Message 6
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| Subject: | Re: An icon and teacher of teachers has left us . . |
.
Actually, we lost two analog icons...
http://www.edn.com/article/518568-Analog_engineering_legend_Bob_Pease_killed_in_car_crash.php
Dick Tasker
Robert L. Nuckolls, III wrote:
>
> See:
>
> http://www.edn.com/article/print/518496-Analog_guru_Jim_Williams_dies_after_stroke.php
>
> Would that we all achieve 1/10th of what this man has
> accomplished both as a creator of new ideas and as
> teacher of how those ideas work . . .
>
>
> Bob . . .
>
>
Message 7
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| Subject: | Re: Mechanics of adding resistors |
Thanks, Bob
You are right on top of everything, as usual.
Michael Wynn
Do Not Archive
In a message dated 6/27/2011 7:45:17 A.M. Pacific Daylight Time,
nuckolls.bob@aeroelectric.com writes:
At 08:41 AM 6/27/2011, you wrote:
Hi all,
I am wiring a Grand Rapids EIS 4000 into my RV 8. The unit has a 4.8V
"exciter" circuit. Two auxiliary inputs are for fuel tank sensors. I
understand from the wiring diagram here
_http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_s
M4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf
_
(http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf) I tried
to open that link but was not successful . . .
that I wire a 470 ohm resistor between the 4.8V exciter circuit and the
wire to the fuel tank sensor. The other end of the fuel tank sensor goes to
ground.
Since there are two circuits, one to each fuel tank, I had thought to
solder or crimp the two resistors to the exciter wire and then strip a half
inch of the wire from the EIS unit to the fuel sensor. The ends of the
resistors would be soldered into the sensor wire and the joint covered in heat
shrink.
Like this?
See: _http://www.aeroelectric.com/articles/Homeless/Homeless_Components.htm
_ (http://www.aeroelectric.com/articles/Homeless/Homeless_Components.htm)
I began to wonder how much heat would be generated and if I need to
protect this from other wires. I wouldn't think there would be much heat since
there is little current in a sensor.
Correct. If there's a reason for selecting larger
than necessary for electrical performance, it's for
mechanical robustness. Consider 1/2 watt resistors
for this task.
Bob . . .
Message 8
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| Subject: | Re: An icon and teacher of teachers has left us . |
. .
At 03:33 PM 6/27/2011, you wrote:
><retasker@optonline.net>
>
>Actually, we lost two analog icons...
>
>http://www.edn.com/article/518568-Analog_engineering_legend_Bob_Pease_killed_in_car_crash.php
>
>Dick Tasker
Just damn . . . the gods are not smiling on us these days.
Bob . . .
Message 9
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| Subject: | Re: Mechanics of adding resistors |
At 04:21 PM 6/27/2011, you wrote:
>Thanks, Bob
>
>You are right on top of everything, as usual.
It's worthy of note that others had the same
advice. If more than one individual has been-there-
done-that, it MUST be a practical recipe for
success.
Bob . . .
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