---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 06/27/11: 9 ---------------------------------------------------------- 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 _____________________________________ Time: 06:47:32 AM PST US From: MLWynn@aol.com Subject: AeroElectric-List: 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 _____________________________________ Time: 07:44:12 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 08:04:19 AM PST US Subject: Re: AeroElectric-List: Mechanics of adding resistors From: Christopher SeaStone 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, 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 _____________________________________ Time: 08:17:57 AM PST US From: "Vern Little" Subject: Re: AeroElectric-List: 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 . . . ------------------------------------------------------------------------- ------- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 5 _____________________________________ Time: 01:00:06 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: 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 _____________________________________ Time: 01:37:17 PM PST US From: Richard Tasker Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 02:25:36 PM PST US From: MLWynn@aol.com Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 03:12:38 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: An icon and teacher of teachers has left us . . . At 03:33 PM 6/27/2011, you wrote: > > >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 _____________________________________ Time: 04:17:50 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.