---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 03/15/05: 29 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:52 AM - Alternator Control (Richard Garforth) 2. 02:29 AM - Re: Points for discussion OVP//more (Hans Teijgeler) 3. 03:11 AM - Re: the ideal OV protection (maybe (Jan de Jong) 4. 05:35 AM - Re: Points for discussion OVP//more (Matt Jurotich) 5. 06:13 AM - Re: Re: the ideal OV protection (maybe (Robert L. Nuckolls, III) 6. 06:24 AM - Re: Points for discussion OVP//more (Robert L. Nuckolls, III) 7. 06:58 AM - Re: Re: the ideal OV protection (maybe) (Robert L. Nuckolls, III) 8. 07:05 AM - Re: Subaru z-figure (Robert L. Nuckolls, III) 9. 07:34 AM - Re: Bob's approval electrical for Eggenfelner all electric (Robert L. Nuckolls, III) 10. 07:35 AM - Re: Re: Subaru z-figure (Hans Teijgeler) 11. 07:53 AM - Re: Re: Subaru z-figure (Robert L. Nuckolls, III) 12. 08:49 AM - Re: Re: Subaru z-figure (Jon Finley) 13. 09:59 AM - Re: Re: the ideal OV protection (maybe (D Wysong) 14. 02:49 PM - Re: Points for discussion OVP//more (Charlie England) 15. 03:16 PM - StripMaster Wire Strippers (Sean Stephens) 16. 04:03 PM - Re: Re: the ideal OV protection (maybe (Robert L. Nuckolls, III) 17. 04:25 PM - Re: MBS4991 Source (Jim Stone) 18. 04:45 PM - Re: MBS4991 Source (Robert L. Nuckolls, III) 19. 04:59 PM - Re: StripMaster Wire Strippers (Sean Stephens) 20. 05:21 PM - SSRs to control annunciator lights? (Kevin Horton) 21. 06:29 PM - GTX-327 (Mark/Micki Phillips) 22. 06:29 PM - GTX-327 (Mark/Micki Phillips) 23. 06:36 PM - Re: GTX-327 (Neil K Clayton) 24. 06:53 PM - Re: GTX-327 (Stein Bruch) 25. 07:09 PM - Re: GTX-327 (B Tomm) 26. 07:10 PM - Re: GTX-327 (B Tomm) 27. 07:34 PM - Using a 115 volt 400 hz device in a 12 volt airplane (Tony Johnson) 28. 07:52 PM - Re: GTX-327 (Stein Bruch) 29. 08:52 PM - Sudden overwhelming signal on radio? (Dr. Andrew Elliott) ________________________________ Message 1 _____________________________________ Time: 01:52:40 AM PST US From: "Richard Garforth" Subject: AeroElectric-List: Alternator Control --> AeroElectric-List message posted by: "Richard Garforth" Paul, Having just had a real long and bad experience with ND internally regulated alternators (without OV protection). I am curious about your statement that suggests you can turn off the alternator via the 'field control' lead. My experience has been you can initiate o/p by applying +12v to the 'field' lead but subsequent removal of the 12 volts leaves the alt churning out amps. Have the alternators supplied by VANS (60 amp ND) a different regulator ? Richard ( a convert to B&C ) ________________________________ Message 2 _____________________________________ Time: 02:29:31 AM PST US From: "Hans Teijgeler" Subject: RE: AeroElectric-List: Points for discussion OVP//more --> AeroElectric-List message posted by: "Hans Teijgeler" Mickey, Your local car dealer, or better: a shop that specializes in alternators. Hans > -----Oorspronkelijk bericht----- > Van: owner-aeroelectric-list-server@matronics.com [mailto:owner- > aeroelectric-list-server@matronics.com] Namens Mickey Coggins > Verzonden: maandag 14 maart 2005 23:15 > Aan: aeroelectric-list@matronics.com > Onderwerp: Re: AeroElectric-List: Points for discussion OVP//more > > --> AeroElectric-List message posted by: Mickey Coggins matronics@rv8.ch> > > Hi, > > Where does one buy a *new* ND alternator? > > Thanks, > Mickey > > > > > > The increasingly common use of the ND internally regulated alternator > along > > with modern regulators suggests the following approach to the OV issue. > > > > Use a hi quality ND rebuild alternator and / or a new one. One with a hi > > quality regulator that controls the field all the time. > > > > -- > Mickey Coggins > http://www.rv8.ch/ > #82007 Wiring > > > > > ________________________________ Message 3 _____________________________________ Time: 03:11:46 AM PST US From: Jan de Jong Subject: AeroElectric-List: Re: the ideal OV protection (maybe --> AeroElectric-List message posted by: Jan de Jong Ah, yes, I found it: http://www.aeroelectric.com/articles/crowbar.pdf. B&C still shows the 6-parts diagram. And supplies it presumably. >Take a look at the newer crow bar circuit. >It doesn't use the obsolete unijunction. Now it just uses a transistor >trigger. >Ken > > Jan de Jong ________________________________ Message 4 _____________________________________ Time: 05:35:26 AM PST US From: Matt Jurotich Subject: Re: AeroElectric-List: Points for discussion OVP//more --> AeroElectric-List message posted by: Matt Jurotich Bob and Paul et all I have been reading the OVP discussion with great interest. The system on my plane is a 60 amp B&C alt with the B&C voltage regulator (LR 3-14C??). For the sake of discussion say I want to limit the crowbar current per Paul Messenger advice, what is the recommended resistor size, ohms and watts? Could I get a similar result by making the 20 gauge wire to the circuit breaker 6 feet instead of 2? Thanks Matthew M. Jurotich e-mail mail to: phone : 301-286-5919 ________________________________ Message 5 _____________________________________ Time: 06:13:22 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: the ideal OV protection (maybe --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 12:15 PM 3/15/2005 +0100, you wrote: >--> AeroElectric-List message posted by: Jan de Jong > >Ah, yes, I found it: http://www.aeroelectric.com/articles/crowbar.pdf. >B&C still shows the 6-parts diagram. And supplies it presumably. > > >Take a look at the newer crow bar circuit. > >It doesn't use the obsolete unijunction. Now it just uses a transistor B&C did a lifetime buy of the MBS4991 trigger diodes before they disappeared. I think they found several thousands so availability of the device pictured at: http://www.aeroelectric.com/Pictures/OVM-14_B.jpg will be available for some time. Bob . . . ________________________________ Message 6 _____________________________________ Time: 06:24:48 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Points for discussion OVP//more --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 08:31 AM 3/15/2005 -0500, you wrote: >--> AeroElectric-List message posted by: Matt Jurotich > > >Bob and Paul et all > >I have been reading the OVP discussion with great interest. The system on >my plane is a 60 amp B&C alt with the B&C voltage regulator (LR >3-14C??). For the sake of discussion say I want to limit the crowbar >current per Paul Messenger advice, what is the recommended resistor size, >ohms and watts? Could I get a similar result by making the 20 gauge wire >to the circuit breaker 6 feet instead of 2? Sure . . . 20AWG is 10 milliohms per foot. But how long are your leads now and what resistances are already in place to limit current? In the bench test experiment I documented yesterday the dominant circuit resistances were stuff other than wire. Consider further the effects of increasing loop resistance in the crowbar system . . . time to trip goes up, heat dissipated in the crowbar SCR for a trip-event goes up. It seems that the most important question is "When the crowbar system is installed such that OV protection performance is maximized, what are the down sides to the rest of the system?" Analysis based on the bench test indicated that one would have to work diligently to reduce loop resistance such that crowbar currents would approach 250 amps. Even then, the event is over in under 10 milliseconds and bus voltage drops to 10.6 volts. In most installations of crowbar OV protection systems offered by B&C and illustrated in the Z-figures, it's unlikely that the system as-installed will approach the 250A idealized trip currents described in the experiment report . . . but assuming your system IS capable of producing a 250A trip current, is there any analysis to support the notion that this is "bad" for other systems in the aircraft? Bob . . . ________________________________ Message 7 _____________________________________ Time: 06:58:46 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: the ideal OV protection (maybe) --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 03:09 PM 3/14/2005 +0100, you wrote: >--> AeroElectric-List message posted by: Jan de Jong > >Bob, >Thank you for the voice of experience. >I'm sure you're right that politeness is overrated nowadays. >The OVM-14 is an amazing result with discrete parts. How a simple little >unijunction thingy can make a whole lot of complexity unnecessary. Very >interesting. I hope they will keep making them. Digikey seems to carry >only PUT's now in the small unijunction categories. The OVM-14 started out with a precision trigger diode from Teccore . . . the part number escapes me at the moment. This is the part you can see in the far left on: http://www.aeroelectric.com/Pictures/OVM_14_Prototype.jpg Teccor didn't sell many of them and the yields were poor in manufacturing so they discontinued it. We went to the MBS4992 trigger diode from Motorola (now Onsemi). Yields were poor and market utilization was low so that part became difficult to find. We went to the less precise cousin, the MBS4991. This drove the decision to add a potentiometer as shown in http://www.aeroelectric.com/Pictures/OVM-14_B.jpg so that variability of the 4991 could be accommodated. When Motorola discontinued the 4991, we made lifetime buys in the thousands so that the project wouldn't need to be re-designed again. The two transistor array in the DIY project mimics a unijunction. Unijunction devices trigger on a ratio of the inter-base resistances and applied inter-base voltage. In the two-transistor implementation, the "inter-base" voltage is set by the external zener reference. I believe the MBS4992 has been designed out of all B&C's LR and LS series regulators in favor of the two-transistor faux unijunction. Only the OVM-14 still uses the MBS4992. If folks would like to build the minimum parts count crowbar OVM, it could be assembled very much like the prototype illustrated in the first photo above. I have several hundred MBS4992 trigger diodes left over from my own production runs of the OVM-14. If folks want some, they can contact me directly. The 'spider web' construction of a crowbar ov module is quite robust when covered with a piece of heat-shrink. Resistors can be hand-selected for proper trip point thus eliminating the potentiometer. Bob . . . ________________________________ Message 8 _____________________________________ Time: 07:05:42 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Re: Subaru z-figure --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" Z-19 was produced in cooperation with an individual builder for use with his Subaru engine. I've had no conversations with suppliers of engine packages although I've offered a collaborative effort on several occasions to several such suppliers. I've not heard from the builder. This was several years ago and I'd have to dig around in my e-mails to see if I can locate him. As I recall, our several exchanges of Z-19 iterations ended with him expressing satisfaction with the approach. If anyone has some suggestions and/or critical review useful for enhancements to the approach, I'd be pleased to receive them. Bob . . . At 11:35 AM 3/14/2005 -0500, you wrote: >--> AeroElectric-List message posted by: "Brian Meyette" > > >As someone who does not plan to use the EXPBUS in my Eggenfellner >installation, I would be most interested in something specific that Bob >could put together. There was a lot of talk on the Eggenfellner list awhile >back about someone designing a replacement for the EXPBUS, but it didnt >materialize. I plan to use a combination of modified versions of Bobs >existing layouts and a couple of the Hyperion components. Anything that >Bob could put together as a complete, professional layout for the >Eggenfellner FWF (all-electric, one alternator, dual batteries, with full >backup, switchover, and protection) would be just great. >brian >expecting my STi in just a couple more weeks! >http://brian76.mystarband.net/RV-7Ahome.htm > > >-----Original Message----- >From: B Tomm [mailto:fvalarm@rapidnet.net] >To: 'subaruaircraft@yahoogroups.com' >Subject: RE: [subaruaircraft] Re: CV Report on Ind Mod Failure > >Gary, > >Thanks for the thoughtful reply. I'm sure Bob would be more than happy to >adapt an electrical layout for the EGG package. That is essentially what >Z-19 is. The only major mod that I can think of is putting the batteries >aft of the baggage (RV7A H6). I have already talked to him about this but >not finalized the details yet. I'll copy this email to Bob for comment. > >Bevan > >-----Original Message----- >From: Gary Newsted [SMTP:fcs@jlc.net] >To: subaruaircraft@yahoogroups.com >Subject: [subaruaircraft] Re: CV Report on Ind Mod Failure > > >I should point out that it is CV's optional enunciator module that I >have trouble with. The EXP is fine for what it does. > >When I started working on the electrical design, I was given the EXP >as a starting point. That is, take this design and make it work for >us, improve it where you can, but most importantly, make it >consistent. I feel that this has been achieved, and credit goes to >many people in this newsgroup for contributing their expertise. > >The install guide presents an airworthy adaptation of the EXP for >Eggenfellner engines, and tries to make the installation clear and >simple. If you follow the guide, you will have a modern, airworthy >system which is easy to operate and easy for us to diagnose should it >ever give you trouble. I occasionally pick on people who deviate >from this design, not because the design is perfect, but because I >believe consistency is at the very root of the success of >Eggenfellner packages. > >Let's face it, the thing that will bring down a Subaru will be fuel >or electrical, so these two systems must be consistent, with lots of >eyes reviewing these designs. One failure impacts all of us. > >Several times we have tossed around the pros and cons >of "conventional" electrical designs, of which Aeroelectrics are a >good example. I have not pursued this, although others have. In my >eyes, conventional designs leave too many doors open which could >result in inconsistency and even dangerous installations. If some >qualified individual wanted to invest the time and energy into >perfecting and thoroughly documenting a conventional design >specifically for the Eggenfellner engines, I think Jan would support >the effort (in spirit anyway). > >If you are a long ways away from wiring, don't rush into your >decision either. There just might be better things coming soon. ________________________________ Message 9 _____________________________________ Time: 07:34:27 AM PST US From: "Robert L. Nuckolls, III" system Subject: AeroElectric-List: Re: Bob's approval electrical for Eggenfelner all electric system --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" system At 02:14 PM 3/14/2005 -0800, you wrote: >--> AeroElectric-List message posted by: B Tomm > >Yes I agree and I think many other will also be looking for "Bob and Jan >approved" electrical system for Egg Subies. I suspect that it will be very >close to Z-19 BUT I for one would sure like to hear from Bob and Jan on >this. It's not really up to me. The "blessing" has to come from someone who intends to use this architecture (or variant) on their airplane or as a recommended architecture for their product. My talents go toward suggestions for reduced parts count, favorable failure mode effects analysis and pilot-friendly operation. The final buy-off needs to come from the users based on their understanding and acceptance of simple- ideas used to assemble the final configuration. Bob . . . ________________________________ Message 10 ____________________________________ Time: 07:35:19 AM PST US From: "Hans Teijgeler" Subject: RE: AeroElectric-List: Re: Subaru z-figure --> AeroElectric-List message posted by: "Hans Teijgeler" Bob, I've downloaded a whole bunch from your web site, but the Z figures in those downloads do not include a Z-19. Could you please give me a steer? Thanks Hans > -----Oorspronkelijk bericht----- > Van: owner-aeroelectric-list-server@matronics.com [mailto:owner- > aeroelectric-list-server@matronics.com] Namens Robert L. Nuckolls, III > Verzonden: dinsdag 15 maart 2005 16:05 > Aan: aeroelectric-list@matronics.com > Onderwerp: AeroElectric-List: Re: Subaru z-figure > > --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > > > Z-19 was produced in cooperation with an individual builder > for use with his Subaru engine. I've had no conversations with > suppliers of engine packages although I've offered a collaborative > effort on several occasions to several such suppliers. > > I've not heard from the builder. This was several years ago > and I'd have to dig around in my e-mails to see if I can locate > him. As I recall, our several exchanges of Z-19 > iterations ended with him expressing satisfaction with the > approach. If anyone has some suggestions and/or critical review > useful for enhancements to the approach, I'd be pleased to > receive them. > > Bob . . . > > > At 11:35 AM 3/14/2005 -0500, you wrote: > > >--> AeroElectric-List message posted by: "Brian Meyette" > > > > > >As someone who does not plan to use the EXPBUS in my Eggenfellner > >installation, I would be most interested in something specific that Bob > >could put together. There was a lot of talk on the Eggenfellner list > awhile > >back about someone designing a replacement for the EXPBUS, but it didnt > >materialize. I plan to use a combination of modified versions of Bobs > >existing layouts and a couple of the Hyperion components. Anything that > >Bob could put together as a complete, professional layout for the > >Eggenfellner FWF (all-electric, one alternator, dual batteries, with full > >backup, switchover, and protection) would be just great. > >brian > >expecting my STi in just a couple more weeks! > >http://brian76.mystarband.net/RV-7Ahome.htm > > > > > >-----Original Message----- > >From: B Tomm [mailto:fvalarm@rapidnet.net] > >To: 'subaruaircraft@yahoogroups.com' > >Subject: RE: [subaruaircraft] Re: CV Report on Ind Mod Failure > > > >Gary, > > > >Thanks for the thoughtful reply. I'm sure Bob would be more than happy > to > >adapt an electrical layout for the EGG package. That is essentially what > >Z-19 is. The only major mod that I can think of is putting the batteries > >aft of the baggage (RV7A H6). I have already talked to him about this > but > >not finalized the details yet. I'll copy this email to Bob for comment. > > > >Bevan > > > >-----Original Message----- > >From: Gary Newsted [SMTP:fcs@jlc.net] > >To: subaruaircraft@yahoogroups.com > >Subject: [subaruaircraft] Re: CV Report on Ind Mod Failure > > > > > >I should point out that it is CV's optional enunciator module that I > >have trouble with. The EXP is fine for what it does. > > > >When I started working on the electrical design, I was given the EXP > >as a starting point. That is, take this design and make it work for > >us, improve it where you can, but most importantly, make it > >consistent. I feel that this has been achieved, and credit goes to > >many people in this newsgroup for contributing their expertise. > > > >The install guide presents an airworthy adaptation of the EXP for > >Eggenfellner engines, and tries to make the installation clear and > >simple. If you follow the guide, you will have a modern, airworthy > >system which is easy to operate and easy for us to diagnose should it > >ever give you trouble. I occasionally pick on people who deviate > >from this design, not because the design is perfect, but because I > >believe consistency is at the very root of the success of > >Eggenfellner packages. > > > >Let's face it, the thing that will bring down a Subaru will be fuel > >or electrical, so these two systems must be consistent, with lots of > >eyes reviewing these designs. One failure impacts all of us. > > > >Several times we have tossed around the pros and cons > >of "conventional" electrical designs, of which Aeroelectrics are a > >good example. I have not pursued this, although others have. In my > >eyes, conventional designs leave too many doors open which could > >result in inconsistency and even dangerous installations. If some > >qualified individual wanted to invest the time and energy into > >perfecting and thoroughly documenting a conventional design > >specifically for the Eggenfellner engines, I think Jan would support > >the effort (in spirit anyway). > > > >If you are a long ways away from wiring, don't rush into your > >decision either. There just might be better things coming soon. > > > > > ________________________________ Message 11 ____________________________________ Time: 07:53:10 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Re: Subaru z-figure --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 04:34 PM 3/15/2005 +0100, you wrote: >--> AeroElectric-List message posted by: "Hans Teijgeler" > >Bob, > >I've downloaded a whole bunch from your web site, but the Z figures in those >downloads do not include a Z-19. Could you please give me a steer? > >Thanks This is a pending rev 11 addition. Sneak peek at: http://www.aeroelectric.com/PPS/Architecture/Zfigs_K_5.pdf Bob . . . ________________________________ Message 12 ____________________________________ Time: 08:49:24 AM PST US From: "Jon Finley" Subject: RE: AeroElectric-List: Re: Subaru z-figure --> AeroElectric-List message posted by: "Jon Finley" Sort of opportune moment to jump into this thread Ive been trying to find the time to compose some intelligent questions about a simple electron-dependent-engine system (Subaru). After studying the Z diagrams (I've not yet studied these sneak-peak diagrams), I came up came up with the system posted on my website (http://www.finleyweb.net/default.asp?id=131). This was designed and constructed more than a year ago. Since this time Ive learned a lot by lurking here and now understand that my system has a number of weaknesses/problems (which probably means that are more things that I dont even know about yet). My biggest issue/hurdle is that the relevant Z diagrams seem overly complicated for my simple system. I do not have a highly complex airplane nor do I have a difficult mission profile. While I am an IFR pilot, I know that my airplane is strictly VFR. When I detect an electrical problem, everything in the airplane is going to be shutdown. The engine keeps running from the battery and I land (within an hour). I dont NEED a radio, transponder, gauges, five-hour range, etc... just need the engine to keep running for a bit. I could probably babble on for a long time about this but my point (really a request) is that I would really like to see a simple system for a Subaru. Thanks Bob! Jon Finley N90MG Q2 - Subaru EJ-22 DD - 467 Hrs. TT Apple Valley, Minnesota http://www.FinleyWeb.net/Q2Subaru ---------- Original Message ---------------------------------- From: "Robert L. Nuckolls, III" >--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > >At 04:34 PM 3/15/2005 +0100, you wrote: > >>--> AeroElectric-List message posted by: "Hans Teijgeler" >> >>Bob, >> >>I've downloaded a whole bunch from your web site, but the Z figures in those >>downloads do not include a Z-19. Could you please give me a steer? >> >>Thanks > >This is a pending rev 11 addition. Sneak peek at: > >http://www.aeroelectric.com/PPS/Architecture/Zfigs_K_5.pdf > > Bob . . . ________________________________ Message 13 ____________________________________ Time: 09:59:30 AM PST US From: D Wysong Subject: Re: AeroElectric-List: Re: the ideal OV protection (maybe --> AeroElectric-List message posted by: D Wysong FWIW - Mouser (www.mouser.com) carries the NTE6403 as a "drop in replacement" for the extinct Motorola MBS499X part(s) if someone is following the old schematic. The NTE part will cost you $8, though! D ------------------------ Robert L. Nuckolls, III wrote: > --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > > At 12:15 PM 3/15/2005 +0100, you wrote: > > B&C did a lifetime buy of the MBS4991 trigger diodes before they disappeared. > ________________________________ Message 14 ____________________________________ Time: 02:49:53 PM PST US From: Charlie England Subject: Re: AeroElectric-List: Points for discussion OVP//more --> AeroElectric-List message posted by: Charlie England Mickey Coggins wrote: >--> AeroElectric-List message posted by: Mickey Coggins > >Hi, > >Where does one buy a *new* ND alternator? > >Thanks, >Mickey > For anyone new to this thread, ND is Nippon Denso (I hope I spelled that correctly...), a Japanese brand name on automotive electrical products. Most automotive parts houses have both new & rebuilt versions on their shelves. There might be multiple brands available for any particular car model, so if you are forced to specify a '1979 Belchfire 300' to get the alternator you want, just open the box & check the label on the alternator for the correct brand name. I know this is stating the obvious for some, but 'ND' might be a bit cryptic for new arrivals. Charlie ________________________________ Message 15 ____________________________________ Time: 03:16:53 PM PST US From: Sean Stephens Subject: AeroElectric-List: StripMaster Wire Strippers --> AeroElectric-List message posted by: Sean Stephens Which model of Stripmaster wire strippers is recommended? There are so many model numbers I was getting dizzy trying to pick the right one. 45-1551 by chance? Also, any recommendations for an online resource with good prices? Thanks... Sean ________________________________ Message 16 ____________________________________ Time: 04:03:38 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: the ideal OV protection (maybe --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 12:05 PM 3/15/2005 -0600, you wrote: >--> AeroElectric-List message posted by: D Wysong > >FWIW - Mouser (www.mouser.com) carries the NTE6403 as a "drop in >replacement" for the extinct Motorola MBS499X part(s) if someone is >following the old schematic. The NTE part will cost you $8, though! Ouch! I think I was paying 0.16 each in thousands for this part. I'll let the MBS4992's I have go out for $1 each. Bob . . . ________________________________ Message 17 ____________________________________ Time: 04:25:54 PM PST US From: "Jim Stone" Subject: RE: AeroElectric-List: MBS4991 Source --> AeroElectric-List message posted by: "Jim Stone" FWIW Try http://www.midwestsurplus.net/en-us/dept_30.html for MBS4991 at $0.25 ea. The ones I got worked fine. Jim Stone Jabiru J450 Clearwater FL ________________________________ Message 18 ____________________________________ Time: 04:45:28 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: MBS4991 Source --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 07:25 PM 3/15/2005 -0500, you wrote: >--> AeroElectric-List message posted by: "Jim Stone" > >FWIW Try http://www.midwestsurplus.net/en-us/dept_30.html for MBS4991 at >$0.25 ea. The ones I got worked fine. Good find! I'm pleased that there are some still running in the wild. For those interested in a DIY project for crowbar OV module utilizing the MBS4991 trigger diode, the old schematic and bill of materials has been posted at: http://www.aeroelectric.com/PPS/DCPwr/OV/OVM-14_mbs4991.pdf Bob . . . ________________________________ Message 19 ____________________________________ Time: 04:59:11 PM PST US From: Sean Stephens Subject: AeroElectric-List: Re: StripMaster Wire Strippers --> AeroElectric-List message posted by: Sean Stephens Sorry, found this link and was wondering if it is a good price and the correct model... Thanks... Sean Stephens wrote: > Which model of Stripmaster wire strippers is recommended? There are > so many model numbers I was getting dizzy trying to pick the right > one. 45-1551 by chance? > > Also, any recommendations for an online resource with good prices? > > Thanks... > > Sean > ________________________________ Message 20 ____________________________________ Time: 05:21:54 PM PST US From: Kevin Horton Subject: AeroElectric-List: SSRs to control annunciator lights? --> AeroElectric-List message posted by: Kevin Horton I'm looking for comments on a way to control some annunciator lights. I've got four Vivisun 20/20 M22885/90 incandescent annunciator lights that have 28v bulbs. I'm told that 14v bulbs are rare and expensive, so I'll add a DC-DC voltage converter using a National LM3478 eval board, as I've got a 14v aircraft. I think I can simply use 14v as the dim setting, and 28v as the high setting. The signals that control the lights are all high = ON. I think the simplest way to sort all this out is to use four relays (or perhaps solid-state relays - SSRs) to control the ground from the each light. That way I can use a single feed of 28v or 14v from a ON-ON BRT-DIM switch and have it feed all four annunciators. Using four mechanical relays to control the ground for each annunciator will work, but I wonder if SSRs would provide a smaller, more reliable solution. I don't know much at all about SSRs though. My web searching hasn't hit the gold mine yet, so I am looking for advice. I'd like recommendations on some sort of 4-channel SSR that would be reasonably priced, easy to install and robust. Each annunciator will draw about 0.12a at 28v. Or, is there a better way to control four annunciators and and feed them 28v or 14v for dimming? Thanks in advance, -- Kevin Horton RV-8 (finishing kit) Ottawa, Canada http://www.kilohotel.com/rv8 ________________________________ Message 21 ____________________________________ Time: 06:29:57 PM PST US From: "Mark/Micki Phillips" Subject: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Mark/Micki Phillips" Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? Mark Phillips WIlliamsville,Illinois RV-6 Finishing ________________________________ Message 22 ____________________________________ Time: 06:29:57 PM PST US From: "Mark/Micki Phillips" Subject: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Mark/Micki Phillips" Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? Mark Phillips WIlliamsville,Illinois RV-6 Finishing ________________________________ Message 23 ____________________________________ Time: 06:36:39 PM PST US From: Neil K Clayton Subject: Re: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: Neil K Clayton A 3/32" allen key. Neil At 09:28 PM 3/15/2005, you wrote: >--> AeroElectric-List message posted by: "Mark/Micki Phillips" > > >Anyone have any info on what type of screwdriver or tool that Garmin uses >to loosin the latching mechanism to the tray??? >Mark Phillips >WIlliamsville,Illinois >RV-6 Finishing > > ________________________________ Message 24 ____________________________________ Time: 06:53:18 PM PST US From: "Stein Bruch" Subject: Re: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Stein Bruch" It's a small "allen" wrench or hex type wrench. Cheers, Stein. ---------- Original Message ---------------------------------- From: "Mark/Micki Phillips" >--> AeroElectric-List message posted by: "Mark/Micki Phillips" > >Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? >Mark Phillips >WIlliamsville,Illinois >RV-6 Finishing > > ________________________________ Message 25 ____________________________________ Time: 07:09:44 PM PST US From: B Tomm Subject: RE: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: B Tomm Stein, By the way what is the approximate price diff between the GTX-330 and 327? -----Original Message----- From: Stein Bruch [SMTP:stein@steinair.com] Subject: Re: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Stein Bruch" It's a small "allen" wrench or hex type wrench. Cheers, Stein. ---------- Original Message ---------------------------------- From: "Mark/Micki Phillips" >--> AeroElectric-List message posted by: "Mark/Micki Phillips" > >Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? >Mark Phillips >WIlliamsville,Illinois >RV-6 Finishing > > ________________________________ Message 26 ____________________________________ Time: 07:10:10 PM PST US From: B Tomm Subject: RE: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: B Tomm Stein, By the way what is the approximate price diff between the GTX-330 and 327? Sorry to hit send before signing off. Bevan RV7A fuse -----Original Message----- From: Stein Bruch [SMTP:stein@steinair.com] Subject: Re: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Stein Bruch" It's a small "allen" wrench or hex type wrench. Cheers, Stein. ---------- Original Message ---------------------------------- From: "Mark/Micki Phillips" >--> AeroElectric-List message posted by: "Mark/Micki Phillips" > >Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? >Mark Phillips >WIlliamsville,Illinois >RV-6 Finishing > > ________________________________ Message 27 ____________________________________ Time: 07:34:17 PM PST US From: "Tony Johnson" Subject: AeroElectric-List: Using a 115 volt 400 hz device in a 12 volt airplane --> AeroElectric-List message posted by: "Tony Johnson" I have a pitot tube that is wired for a 115 volts at 400 hz. I would like to use it on my RV8A, which will have a 12 volt system. I applied 110v house current to the tube, using a dimmer switch set at the lowest setting. The tube heated up. I was afraid to increase the power to it. My plan is to acquire an adjustable resistor, set it for high resistance, and apply 12volts through it to the tube, probably with a fuse inline between the resistor and tube. I would appreciate any input as to how to arrange to use the tube on my 12 volt system. Tony Johnson RV8A Orlando ________________________________ Message 28 ____________________________________ Time: 07:52:40 PM PST US From: "Stein Bruch" Subject: RE: AeroElectric-List: GTX-327 --> AeroElectric-List message posted by: "Stein Bruch" The 330 is a little over double the cost of the 327, wherever you buy it from. Cheers, Stein do not archive ---------- Original Message ---------------------------------- From: B Tomm >--> AeroElectric-List message posted by: B Tomm > >Stein, > >By the way what is the approximate price diff between the GTX-330 and 327? > >-----Original Message----- >From: Stein Bruch [SMTP:stein@steinair.com] >Sent: Tuesday, March 15, 2005 6:52 PM >To: aeroelectric-list@matronics.com >Subject: Re: AeroElectric-List: GTX-327 > >--> AeroElectric-List message posted by: "Stein Bruch" > >It's a small "allen" wrench or hex type wrench. > >Cheers, >Stein. > > >---------- Original Message ---------------------------------- >From: "Mark/Micki Phillips" >Date: Tue, 15 Mar 2005 20:28:16 -0600 > >>--> AeroElectric-List message posted by: "Mark/Micki Phillips" >> >>Anyone have any info on what type of screwdriver or tool that Garmin uses to loosin the latching mechanism to the tray??? >>Mark Phillips >>WIlliamsville,Illinois >>RV-6 Finishing >> >> > > > > > ________________________________ Message 29 ____________________________________ Time: 08:52:36 PM PST US From: "Dr. Andrew Elliott" Subject: AeroElectric-List: Sudden overwhelming signal on radio? --> AeroElectric-List message posted by: "Dr. Andrew Elliott" Folks: I recently installed an ICS-Plus radio in my AA-1. I have been relatively happy with it, but today on a return flight from Mexico, while cruising along FD&H at 10.5 about 30 minutes in, it was suddenly overwhelmed by what sounded to me to be broadband noise. It did not seem to be alternator dependent, as I switched off the alternator and changed RPMs with no apparent effect. The radio has a built in signal strength meter, and it was showing 2-2.5 (of 5) bars with no one transmitting on the frequency. I turned off the auto squelch and turn the manual almost all the way up and was able to use the radio. The noise continued and seemed to get worse (up to 3 bars!) as the flight wore on for almost another 40 minutes (about 100 NM). I checked various frequencies and the A/B switch and all gave the same results. After landing, I glanced at the signal strength display and it was back to the normal minimum it shows when the frequency is cold. Turned down the squelch and all was well. Switched to auto squelch and all stayed well. Gremlin gone? Any ideas on this one?? Andy Elliott N481HY/AA-1(TD,160)/KFFZ That's "One Hot Yankee" http://members.cox.net/n481hy/