---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 10/04/08: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:22 AM - 20 Amp Solid State Relay (C William Sallas) 2. 09:10 AM - B+C alternator problem (James Baldwin) 3. 10:38 AM - Re: Kitplanes article on an Elegant LED driver (PSYCHOSE) 4. 03:49 PM - Re: What is the best value battery right now? (Robert L. Nuckolls, III) 5. 03:58 PM - Re: Re: Kitplanes article on an Elegant LED driver (Robert L. Nuckolls, III) 6. 06:14 PM - Re: Kitplanes article on an Elegant LED driver (Brantel) ________________________________ Message 1 _____________________________________ Time: 12:22:12 AM PST US From: C William Sallas Subject: AeroElectric-List: 20 Amp Solid State Relay What is the status of AeroElectric's 20 amp solid state relay? ________________________________ Message 2 _____________________________________ Time: 09:10:13 AM PST US From: "James Baldwin" Subject: AeroElectric-List: B+C alternator problem Bob (and anyone using the LR-3 regulator), Before taking any drastic action like removing or replacing the LR3B regulator I downloaded the troubleshooting guide from B+C. With my new DVM I performed all of the suggested measurements and found the regulator to be doing as it should, no abnormalities. I called Bill at B+C and asked about the PTT (push to test) switch shown connected to pin 2 and what it did. It shorts pin 6 right to ground internally for the OV test. He suggested that the switch really wasn't needed and had given some problems to others in the past. In my case it was the intermittent switch that was blowing fuses no matter which value. So, if you have any problems with blowing the fuse or C/B shown connected to the alternator field circuit this might be a factor. Thanks to Bob for helping, the airplane is back in the air. JBB ________________________________ Message 3 _____________________________________ Time: 10:38:17 AM PST US Subject: AeroElectric-List: Re: Kitplanes article on an Elegant LED driver From: "PSYCHOSE" Thanks for your response Bob. Pardon my ignorance, but I surmise that the capacitances and 100 mH inductance included in your diagram are embedded in the "101" component we see in one of the photos. If this is correct, could you provide the part number of this device? Finally, did you or Brian get a chance to test your design for EMI in the RF range? regards, Normand RV8 wings -------- Normand Gingras RV8 wings Read this topic online here: http://forums.matronics.com/viewtopic.php?p 7372#207372 ________________________________ Message 4 _____________________________________ Time: 03:49:57 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: What is the best value battery right now? At 09:30 AM 10/3/2008 -0700, you wrote: > >I have an RV-8 with an IO-360 180 hp engine and need to replace the >current battery. I think it is a RG-25XC. In past topics I've seen the >Odessey PC-680 mentioned along with the Powersonic (?) PS-12180, Panasonic >LC-X1220P and a LC-RD1217P. > >Is there a current favorite that can be found for a reasonable price? If >so, please post name, model, and a good source. > >Thanks, > >John How do you quantify "value"? Lacking data beyond statements like "My brand Z battery has been in the airplane 5 years and it still starts my engine" what qualities in a battery are most important to you. Further, how much $time$ are you willing to spend to acquire, maintain and monitor that battery for ability to meet your design goals? If you're a day vfr airplane, don't care about alternator-out endurance and will accept a risk of having to hand-prop the engine or replace a battery off the home field, then anecdotal offerings of 5-year service life may be useful to you. On the other hand, if you have a design goal of x.x hours alternator- out operation of the endurance bus then meeting the design goal is driven not only by the demonstrated robustness of the battery but your willingness to do periodic capacity tests to make sure the design goals are not violated. Right now, periodic capacity testing involves either running your e-bus from the battery and seeing how long it takes to get down to 11.0 volts -or- doing on-purpose capacity measurements with some device like . . http://westmountainradio.com/CBA.htm that will allow you to do a precise evaluation of your battery's ability to perform. Here's where you have to make a judgement of value based on the economics of $time$. You buy a battery for $time$, buy a piece of test equipment for $time$ and then invest $time$ at each determination for continued airworthiness against your design goals. Nobody can advise you as to the trade offs without knowing your personal quantification on $time$. I've often suggested that the highest value batter is that which meets all design goals with a minimum expenditure of $time$. Consider that if you buy the least expensive battery you can find, say . . . http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=522-1014-ND http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=P231-ND http://www.batteryuniverse.com/Sealed-Lead-Acid/CSB/GH12170/GZ12180NB_CSB_GH12170_Sealed-Lead-Acid and divide the cost of acquisition by hours flown per year and simply replace it every annual, you now have a hard data number for the cost of meeting your design goals. Periodic replacement of an inexpensive battery eliminates the $time$ one is tempted to invest in a $high-quality$ battery, $test-equipment$ and the $time$ to exercise that equipment until the battery finally shows that it's no longer airworthy. That's a decision that nobody can make for you. Further, lacking that detail in a value-study, your choice of product made from the anecdotal influences here on the List are not much better than basing it on a television advertisement. You will find a host of experiences ranging from "that's a piece of trash" to "best battery since they started slicing bread". Nobody is lying to you. Maybe nobody is trying to persuade you. But if you NEED for the battery to perform to some expectations for alternator-out endurance, none of this will be useful data for getting the most return on expenditure of your flying dollars. Bob . . . ________________________________ Message 5 _____________________________________ Time: 03:58:02 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Kitplanes article on an Elegant LED driver At 10:36 AM 10/4/2008 -0700, you wrote: > >Thanks for your response Bob. > >Pardon my ignorance, but I surmise that the capacitances and 100 mH >inductance included in your diagram are embedded in the "101" component >we see in one of the photos. > >If this is correct, could you provide the part number of this device? > >Finally, did you or Brian get a chance to test your design for EMI in the >RF range? > >regards, The input and output filters are 100 uH, 1A inductors flanked both sides by 0.1 uF and 0.001 uF monolythic ceramic capacitors. The parts values are a WAG based on availability of high-current surface mount inductors and inventory. I was hoping to get a window of opportunity to run the assembly through the lab for a quick look-see at DO-160 conducted performance but it didn't come to pass. So I had to forward the assembly you see to Brian for A-B comparison in his as-installed environment. Successful mitigation of Brian's observed interference doesn't necessary mean we have the "golden design", on that noises have been attenuated sufficiently to meet his needs. If it works for Brian, I'm willing to publish the board artwork for the device along with the bill of materials and sources. Haven't heard from Brian yet. Bob . . . ________________________________ Message 6 _____________________________________ Time: 06:14:41 PM PST US Subject: AeroElectric-List: Re: Kitplanes article on an Elegant LED driver From: "Brantel" Hey guys, I received the prototype sometime this week. I have been on vacation and will test and report as soon as possible. Most likely will be Monday or Tuesday evening. Best regards, Brian C. 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