---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 11/03/09: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 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) ________________________________ Message 0 _____________________________________ Time: 12:33:57 AM PST US From: Matt Dralle Subject: AeroElectric-List: November List Fund Raiser A couple of years ago I implemented an automatic "squelch button" of sorts for the Fund Raiser messages. Here's how it works... As soon as a List member makes a Contribution through the Matronics Fund Raiser web site, he or she will instantly cease to receive these Fund Raiser messages for the rest of the month! Its just that simple. Don't you wish PBS worked that way! :-) I really do appreciate each and every one of your individual Contributions to support the Lists. It is your support that enables me to upgrade the hardware and software that are required to run a List Site such as this one. It also goes to pay for the commercial-grade Internet connection and to pay the huge electric bill to keep the computer gear running and the air conditioner powered on. I run all of the Matronics Email List and Forums sites here locally which allows me to control and monitor every aspect of the system for the utmost in reliably and performance. Your personal Contribution matters because, when combined with other Listers such as yourself, it pays the bills to keep this site up and running. I accept exactly ZERO advertising dollars for the Matronics Lists sites. I can't stand the pop-up ads and all other commercials that are so prevalent on the Internet these days and I particularly don't want to have it on my Email List sites. If you appreciate the ad-free, grass-roots, down-home feel of the Matronics Email Lists, please make a Contribution to keep it that way!! http://www.matronics.com/contribution Thank you! Matt Dralle Matronics Email List Administrator [Note that there are certain circumstances where you might still see a Contribution related message. For example, if someone replies to one of the messages, when using the List Browse feature, or when accessing List message via the Forum. The system keys on the given email address and since most of these are anonymous public access methods, there is no simple way to filter them.] ________________________________ Message 1 _____________________________________ Time: 05:15:16 AM PST US Subject: AeroElectric-List: Re: Relays etc From: "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 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=270760#270760 ________________________________ Message 2 _____________________________________ Time: 05:28:37 AM PST US From: Bill Mauledriver Watson Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 08:19:32 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: p-lead signal conditioning or tach gen usage At 04:18 PM 11/2/2009, you wrote: > > >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 _____________________________________ Time: 08:25:03 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Relays etc At 07:12 AM 11/3/2009, you wrote: > > >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 _____________________________________ Time: 10:11:20 AM PST US From: "David E. Nelson" Subject: AeroElectric-List: 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 _____________________________________ Time: 11:04:06 AM PST US From: Etienne Phillips Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 12:29:02 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: What is the SD-8's regulator doing when not being used At 12:29 PM 11/3/2009, you wrote: > > >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 _____________________________________ Time: 05:15:44 PM PST US From: David Nelson Subject: Re: AeroElectric-List: 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: > > > At 12:29 PM 11/3/2009, you wrote: >> >> >> 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 _____________________________________ Time: 06:16:19 PM PST US Subject: AeroElectric-List: Re: p-lead signal conditioning or tach gen usage From: "Craig Winkelmann" 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 ____________________________________ Time: 06:20:26 PM PST US Subject: AeroElectric-List: Re: p-lead signal conditioning or tach gen usage From: "Craig Winkelmann" 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 ____________________________________ Time: 06:56:28 PM PST US Subject: AeroElectric-List: Jabiru regulator wiring and 2nd ground From: "messydeer" 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 ------------------------------------------------------------------------------------- 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.