---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 12/03/10: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:22 AM - Re: Remote Power control for Aircraft PreHeater (John Ciolino) 2. 05:57 AM - Re: Remote Power control for Aircraft PreHeater (Tim Olson) 3. 09:21 AM - Re: PC board for avionics ground bus (Robert L. Nuckolls, III) 4. 09:37 AM - Re: PC board for avionics ground bus (BuckWynd) 5. 10:02 AM - Re: PC board for avionics ground bus (dave.gribble@mchsi.com) 6. 10:08 AM - Re: Headphone impedance (Peter Pengilly) 7. 09:34 PM - Re: PC board for avionics ground bus (Robert L. Nuckolls, III) 8. 10:02 PM - Re: PC board for avionics ground bus (Don) ________________________________ Message 1 _____________________________________ Time: 05:22:25 AM PST US From: "John Ciolino" Subject: RE: AeroElectric-List: Remote Power control for Aircraft PreHeater www.aerothermheaters.com. Uses cell phone rather than web and is expensive but it's an alternative. John Ciolino RV-8 -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Tim Olson Sent: Thursday, December 02, 2010 8:50 PM Subject: AeroElectric-List: Remote Power control for Aircraft PreHeater Does anyone have a good solution for Internet/Web accessible power control for your aircraft sump/cylinder preheat? My personal preference would be something that offers SSH access, that I can log in and power on. Web would work too. It's easy enough to find network power controls that look to be plenty good, if you spend >$250. There are others down just over $100, but some that I find have 6A ratings, and I'd feel more comfortable with something that can handle a good 10A even though that's far more than the heater should use. I do have a PC in the hangar that does security cam recording and such, so another option would be a USB controlled or home automation device. I guess what I'm hoping for is a good solution that people have used successfully....since I know a few various ways to do it...and would like to know cost effective ways if possible. -- Tim Olson - RV-10 N104CD do not archive ________________________________ Message 2 _____________________________________ Time: 05:57:29 AM PST US From: Tim Olson Subject: Re: AeroElectric-List: Remote Power control for Aircraft PreHeater Yeah, I'm lucky in that we have central internet access at the airport available using the Terminal's access, and the city is willing to do port mapping for hangar owners to access things like these switches, so rather than worry about another cellular bill, we can do web/ssh pretty easily. Tim Olson - RV-10 N104CD do not archive On 12/3/2010 7:14 AM, John Ciolino wrote: > --> AeroElectric-List message posted by: "John Ciolino" > > www.aerothermheaters.com. Uses cell phone rather than web and is expensive > but it's an alternative. > > John Ciolino > RV-8 > > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com > [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Tim Olson > Sent: Thursday, December 02, 2010 8:50 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Remote Power control for Aircraft PreHeater > > --> AeroElectric-List message posted by: Tim Olson > > Does anyone have a good solution for Internet/Web accessible > power control for your aircraft sump/cylinder preheat? > > My personal preference would be something that offers SSH > access, that I can log in and power on. Web would work too. > It's easy enough to find network power controls that look > to be plenty good, if you spend>$250. There are others > down just over $100, but some that I find have 6A ratings, > and I'd feel more comfortable with something that can > handle a good 10A even though that's far more than the > heater should use. > > I do have a PC in the hangar that does security cam > recording and such, so another option would be a USB > controlled or home automation device. > > I guess what I'm hoping for is a good solution that > people have used successfully....since I know a few > various ways to do it...and would like to know cost effective > ways if possible. > ________________________________ Message 3 _____________________________________ Time: 09:21:17 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: PC board for avionics ground bus At 01:03 AM 12/3/2010, you wrote: >Anyone know if manufactured PC boards are >available, such as those found in this photo of >a 37-pin D-sub connector used as an avionics ground bus? > >http://www.aeroe lectric.com/Pictures/Grounding/AVG_RA.jpg > > >I could certainly =93roll my own,=94 but if they are >available someplace, I=92d just as soon buy one=85 > >Thank in advance! I've got some of various sizes someplace in my moving boxes. What size are you looking for? Bob . . . ________________________________ Message 4 _____________________________________ Time: 09:37:55 AM PST US Subject: AeroElectric-List: Re: PC board for avionics ground bus From: "BuckWynd" E-Mail sent. Thanks! -------- Buck Wyndham RV-8 N18XL (working on fuselage & systems) Northern Illinois Read this topic online here: http://forums.matronics.com/viewtopic.php?p=322176#322176 ________________________________ Message 5 _____________________________________ Time: 10:02:28 AM PST US From: dave.gribble@mchsi.com Subject: Re: AeroElectric-List: PC board for avionics ground bus Also looking for a grounding board... email to Bob sent! ----- Original Message ----- From: "Robert L. Nuckolls, III" Sent: Friday, December 3, 2010 11:17:27 AM GMT -06:00 US/Canada Central Subject: Re: AeroElectric-List: PC board for avionics ground bus At 01:03 AM 12/3/2010, you wrote: Anyone know if manufactured PC boards are available, such as those found in this photo of a 37-pin D-sub connector used as an avionics ground bus? http://www.aeroelectric.com/Pictures/Grounding/AVG_RA.jpg I could certainly roll my own, but if they are available someplace, Id just as soon buy one Thank in advance! I've got some of various sizes someplace in my moving boxes. What size are you looking for? ________________________________ Message 6 _____________________________________ Time: 10:08:53 AM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: Headphone impedance Hi Bob, Thanks very much for all of that - it will certainly keep me busy over the next few weeks. This is about on the raggedy edge of my electronics capability so should be an interesting learning curve! Yes, installing a box in the fly lead between helmet and radio plugs is clearly the way to go. The radio connector is a Dsub, so no problems making a test harness. Peter On 03/12/2010 01:16, Robert L. Nuckolls, III wrote: > > > At 03:58 PM 12/2/2010, you wrote: > Thanks for all of the input! > > I would like to use the standard headphone output from the radio as > its already wired in - and I didn't even wire up the speaker pin from > the radio, that would also make the set up transferable to other > aircraft. > > The only way you can make this 100% transportable is > to add the necessary electronics to make your headset > EMULATE the standard headset. I.e., 600 ohms of load. > Back in the days I was burning my fingers and > sniffing the smoke over my first soldering iron, > the 'standard' headset was 2000 ohms impedance. > These integrated well with popular crystal and vacuum > tube radios. > > 2K headsets are no longer made in volume and expensive. > However, there are PLENTY of low impedance headsets > for as little as $1 a pair that work with modern > entertainment devices. A few years ago, I designed > a small battery powered amplifier with a 2K input > impedance and adjusted the gain such that similar > signals produced the same sounds from the headsets. > I.e., the modern el-cheapo headsets could be used > on homebrew projects with similar performance as > headsets of yesteryear. > > - Its likely that an aviation radio headset output would overdrive > these speakers > > . . . probably UNDER-DRIVE. The electronics within > the radio simply may not be capable of delivering > the necessary energy into the lower impedance > devices. > > (resulting in poor volume control and possibly poor quality output), > and may suffer some damage to the radio audio amplifier (unlikely). > > . . . mostly. The probable effect is that the received > audio will be heard but an severely reduced volume. > > - To use these speakers/phones I will probably need an audio isolation > amplifier (made as described in Bob's note) > > Quite likely. Further, if you're really interested > in moving across airplanes with this, then your > "adapter" may want to be a fat lump in the cordage > for the speaker/microphone set. > > - Alternatively an amp from ebay may suffice ( for $6 seems a no > brainer :-) ) - but may require some power conditioning (interesting > that specs say 4.5v, but legend on board says 12v). > > The major concern is for conducted noise and transient > voltages. You'll want to use a three-terminal regulator > to "step" down the 14v bus to say 9 volts. The regulator > will provide the isolation from transients and very good > filtering of bus noises. > > and also some gain setting resistors [how do I calculate the value?] > > Cut and try during the brass-board phase. > > - To use the electret mic I will have to build a circuit per Bob's > sketch. > > This too will need to be brass-boarded and checked > on the bench. Do you have a harness to run the radio > on the workbench? > > I think there are are potentially 3 ways ahead. > > 1. Buy amp above and start making mic circuit (perhaps gives the > ability to add an ipod input in the future) > > Recommended. > > 2. Cannibalise an old headset (at least all the components should match) > > Risky for mechanical issues. If you have mic and > headset components with a good track record and they > fit the helmet . . . then 80% of the battle is won. > > 3. Use the Halo headset for the time being and just figure out > sticking the ear plugs in my ears with the helmet around my neck ... > > Ugh! > > Bob . . . > > > Bob . . . > > ________________________________ Message 7 _____________________________________ Time: 09:34:28 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: PC board for avionics ground bus At 11:17 AM 12/3/2010, you wrote: >At 01:03 AM 12/3/2010, you wrote: >>Anyone know if manufactured PC boards are >>available, such as those found in this photo of >>a 37-pin D-sub connector used as an avionics ground bus? >> >>http://www.aero electric.com/Pictures/Grounding/AVG_RA.jpg >> >> >>I could certainly =93roll my own,=94 but if they >>are available someplace, I=92d just as soon buy one=85 >> >>Thank in advance! Would you guys be interested in complete 37-pin kits? I think I've got the inventory on hand to offer these . . . http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg for about $35.00 Gold is going through the roof so I need to check the price of pins on Monday. Bob . . . ________________________________ Message 8 _____________________________________ Time: 10:02:17 PM PST US From: "Don" Subject: RE: AeroElectric-List: PC board for avionics ground bus Bob, If you have enough to offer them to others I'll take one. Thanks and Merry Christmas. Don From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Friday, December 03, 2010 9:17 PM Subject: Re: AeroElectric-List: PC board for avionics ground bus At 11:17 AM 12/3/2010, you wrote: At 01:03 AM 12/3/2010, you wrote: Anyone know if manufactured PC boards are available, such as those found in this photo of a 37-pin D-sub connector used as an avionics ground bus? http://www.aeroelectric.com/Pictures/Grounding/AVG_RA.jpg I could certainly "roll my own," but if they are available someplace, I'd just as soon buy one. Thank in advance! Would you guys be interested in complete 37-pin kits? I think I've got the inventory on hand to offer these . . . http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg for about $35.00 Gold is going through the roof so I need to check the price of pins on Monday. 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.