---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 04/25/10: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:17 AM - Nav Audio Connection (Harold Lanfear) 2. 06:21 AM - Re: Z-12 Power Grid Behavior (user9253) 3. 06:36 AM - Re: Surface temperature sensor (user9253) 4. 07:02 AM - Re: Re: Designing a circuit question (Robert L. Nuckolls, III) 5. 07:14 AM - Re: Nav Audio Connection (Robert L. Nuckolls, III) 6. 08:27 AM - diode to relay (Chris Hukill) 7. 10:48 AM - Re: Nav Audio Connection (Stein Bruch) 8. 10:48 AM - Re: Re: Surface temperature sensor (J. Mcculley) 9. 04:51 PM - Re: diode to relay (Robert L. Nuckolls, III) 10. 06:03 PM - Re: Designing a circuit (Dennis & Anne Glaeser) ________________________________ Message 1 _____________________________________ Time: 05:17:55 AM PST US From: "Harold Lanfear" Subject: AeroElectric-List: Nav Audio Connection I'm currently wiring the audio portion of my Garmin 430W into the intercom. The company that did the harness simply labeled this wire as "Nav Audio, for future use" When I traced the pinouts, I discovered this wire to be the VOR / ILS Audio Hi & Lo wires. Can I connect these to the same pins as the Com Audio without a problem? I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs from my Grand Rapids EIS and some warning systems so I could use this for the Nav input as well, if that would be better. Thanks for the help in advance. Harold Lanfear ________________________________ Message 2 _____________________________________ Time: 06:21:22 AM PST US Subject: AeroElectric-List: Re: Z-12 Power Grid Behavior From: "user9253" > One can normally fly with E-Bus feed switch ON Doing so will not hurt anything. > since an alternator energized Main Bus is at a higher voltage than the battery and it will feed the E-Bus thru the diode when operating. Not true. The Main Bus and battery will be at essentially at the same voltage. The diode will NOT conduct with the E-Bus switch closed because the diode has been shorted out by the parallel current path through the E-Bus switch. > So even if both alternators fail and battery contactor failed the E-Bus will receive battery power without any action required from the pilot. That is true as long as the E-Bus switch is closed. > the Battery Contactor Relay is opened, isolating the battery from the Main Bus, while either alternator is operating, the alternator will continue to provide good power to the Main Bus and E-Bus without the battery in the circuit. Probably, but not certain. It all depends on the components used. > will there be any power quality or stability issues with the electrical system without the battery in the circuit? I do not think so, but am not sure. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=295621#295621 ________________________________ Message 3 _____________________________________ Time: 06:36:02 AM PST US Subject: AeroElectric-List: Re: Surface temperature sensor From: "user9253" Jim McCulley, Good job making an economical and accurate multi-point temperature sensor and indicator. I admire your ingenuity and resourcefulness. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=295622#295622 ________________________________ Message 4 _____________________________________ Time: 07:02:52 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: RE: Designing a circuit question At 04:39 PM 4/24/2010, you wrote: > > I'm fiddling with a variant of the circuit I > > published to convert it to a solid state breaker > > instead of current limiter. > > I'll see if I can publish that variant tomorro evening. > > > > Bob . . . > >Hi Bob, > > If you are still working on this solid state design you talked > about, I was wondering if it would be possible to incorporate a > feature that allows the user to set for different loads. > In other words, a 2amp setting, a 3 amp setting, etc, > etc..........or did you intend on this, anyway? > > I'm really looking forward to what you come up with. I > definitely plan on building it!! Thanks! There is no greater validation of an recipe for success than multiple experiences by multiple chefs in their own kitchens. I suspect there are some other folks on the list who might have some ideas about how to synthesize all silicon circuit breaker. Getting it to trip at the right current isn't hard. What we need to keep in mind about thermal circuit breakers is their I(squared)*R tripping dynamic that gives them some degree of immunity to inrush tripping. In the design study before us, we're dealing with a PM DC motor that has a significant inrush characteristic. so what we'll want to do for THIS case is design a 'breaker' that is also a current limiter but with some form of trip-delay . . . say something on the order of 200 milliseconds. I'm mulling over several ideas for minimizing parts count while meeting design goals. Any electron herders out there want to swap ideas? Bob . . . ________________________________ Message 5 _____________________________________ Time: 07:14:51 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Nav Audio Connection At 07:11 AM 4/25/2010, you wrote: >I'm currently wiring the audio portion of my Garmin 430W into the >intercom. The company that did the harness simply labeled this wire >as "Nav Audio, for future use" When I traced the pinouts, I >discovered this wire to be the VOR / ILS Audio Hi & Lo wires. Can I >connect these to the same pins as the Com Audio without a problem? Yes. LO = ground, HI = nav audio source > >I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs >from my Grand Rapids EIS and some warning systems so I could use >this for the Nav input as well, if that would be better. Normally one would gather all audio sources together into a single mixer . . . so yes, that would be preferre. Bob . . . ________________________________ Message 6 _____________________________________ Time: 08:27:32 AM PST US From: "Chris Hukill" Subject: AeroElectric-List: diode to relay I am wiring my RV10 with an avionics bus relay. I will activate the relay by switching the ground. I want to power the "activate power" lead with both the main bus and the avionics bus, as to allow a back door to the main bus thru the avionics bus, via the alternate ebus feed in the event of a failed master relay, in-flight. I need to know the rating and source for the diodes on the activate power leads. The small 50amp Bosch relay only draws .1 amp to close. Chris Hukill ________________________________ Message 7 _____________________________________ Time: 10:48:29 AM PST US From: "Stein Bruch" Subject: RE: AeroElectric-List: Nav Audio Connection Hi Harold, Not really a good idea to hook those together as they are meant for a separate channel on either the mixer or audio panel/intercom so you can shut the "ident" stream off when no desired. The LOW isn't that big of a deal (Low mostly = ground). Cheers, Stein From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Harold Lanfear Sent: Sunday, April 25, 2010 7:12 AM Subject: AeroElectric-List: Nav Audio Connection I'm currently wiring the audio portion of my Garmin 430W into the intercom. The company that did the harness simply labeled this wire as "Nav Audio, for future use" When I traced the pinouts, I discovered this wire to be the VOR / ILS Audio Hi & Lo wires. Can I connect these to the same pins as the Com Audio without a problem? I'm using Vern Little's AMX-2A Audio Mixer for some audio inputs from my Grand Rapids EIS and some warning systems so I could use this for the Nav input as well, if that would be better. Thanks for the help in advance. Harold Lanfear ________________________________ Message 8 _____________________________________ Time: 10:48:33 AM PST US From: "J. Mcculley" Subject: Re: AeroElectric-List: Re: Surface temperature sensor Thanks, Joe, for the compliment! Hope you find the concept useful for your purposes. Jim ============================================================================================ user9253 wrote: > > Jim McCulley, > Good job making an economical and accurate multi-point temperature sensor and indicator. I admire your ingenuity and resourcefulness. > Joe > > -------- > Joe Gores > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=295622#295622 > > > > > > > > > > > ________________________________ Message 9 _____________________________________ Time: 04:51:30 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: diode to relay At 10:20 AM 4/25/2010, you wrote: >I am wiring my RV10 with an avionics bus relay. I will activate the >relay by switching the ground. I want to power the "activate power" >lead with both the main bus and the avionics bus, as to allow a back >door to the main bus thru the avionics bus, via the alternate ebus >feed in the event of a failed master relay, in-flight. I need to >know the rating and source for the diodes on the activate power >leads. The small 50amp Bosch relay only draws .1 amp to close. The coil spike suppression diodes are the least critical application you'll need to address. Any current rating at any voltage you can find is electrically adequate to the task. However, 1N400x or 1N540x series devices are suggested as MECHANICALLY robust and relatively easy to find. Take your pick of these Radio Shack parts. http://aeroelectric.com/Pictures/Misc/RS_Diodes.jpg Bob . . . ________________________________ Message 10 ____________________________________ Time: 06:03:58 PM PST US From: "Dennis & Anne Glaeser" Subject: AeroElectric-List: Re: Designing a circuit Joe Gores not only suggested using a reed switch to sense my prop end of travel, he even gave me one to try! Today I went out and played a bit. I found that 3 winds of 18AWG causes the switch to close just as the motor starts to strain against the stop. So I used a dab of Goop to mate the wire loops to the reed switch and used a piece of nylon tubing as a container. I'm attaching a picture, but don't remember if those get through on this list. Doing this was a lot easier than I had imagined. It work great on the ground, but the weather here in MI was low IFR all day so no flight testing. I've already ordered the parts for the circuit Bob designed, so I'll be playing with that soon as well. I'll be able to have both methods operating in parallel. Thanks guys! 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