AeroElectric-List Digest Archive

Fri 04/12/13


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 07:13 AM - Re: Re: Diagnostic Help Please: Audio is Weak and Scratchy (Vern Little)
     2. 03:50 PM - Re: LED heatsink material? (wynaire@citlink.net)
 
 
 


Message 1


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    Time: 07:13:54 AM PST US
    From: "Vern Little" <sprocket@vx-aviation.com>
    Subject: Re: Diagnostic Help Please: Audio is Weak
    and Scratchy Bob's design is the grandaddy of several commercial audio mixers, including at least one other open-source device. It's probably a good idea to have variable inputs (see the AMX-2A or AMX-4B at http://store.makerplane.org/avionics/). You haven't mentioned any objectional audio noise in the system, but in my experience the Dynon EFIS is a fairly noisy device. There are a couple of easy fixes for this, so if you have this problem, let me know. Thanks, Vern -----Original Message----- From: Jared Yates Sent: Thursday, April 11, 2013 8:03 PM Subject: Re: AeroElectric-List: Re: Diagnostic Help Please: Audio is Weak and Scratchy It looks like I have the audio troubleshooting solved. I replaced the amplifier chips because I had some extras locally and they are cheap. Then I tested the intercom input by connecting my mp3 player directly to the intercom, bypassing the 9009 all together. All was well. Next I removed all of the inputs to the 9009 except the music, and plugged it in. All was well. Next I connected the Dynon voice circuit. It was acceptable, but a little bit loud. I took out the 300 ohm resistor for that channel and tried a 500. The change was small, so I swapped a few more times, arriving eventually at 1.8k. This really surprised me, since I misunderstood and thought of 300 to be near the top end of the scale. Next I reconnected the 430 nav audio to the 9009 and it was way too loud. I jumped right to the 1k, but it was still very loud. After several steps along the way, each astonishingly higher, I settled on 68k. Now everything works well and the chips aren't getting hot. I mention all ! of this for the benefit of anyone else who will be using the 9009 with these systems- start much higher than 150 ohms! This whole process has given me much more understanding of my audio system, and also a real appreciation for the design of the 9009. Thanks Bob for making it available! I don't know how other folks are getting by without it. On Apr 10, 2013, at 18:21, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com> wrote: > <nuckolls.bob@aeroelectric.com> > > At 05:02 PM 4/10/2013, you wrote: >> <email@jaredyates.com> >> >> Thanks Bob, I'll check that and report back. It turns out the resistors >> were correct, but my EE friend thought at first that they weren't. > > Hmmm . . . the only other thing that > could cause a hot-chip is to have it > soldered in backwards. > > Bob . . . > > ----- No virus found in this message. Checked by AVG - www.avg.com


    Message 2


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    Time: 03:50:29 PM PST US
    From: "wynaire@citlink.net" <wynaire@citlink.net>
    Subject: Re: LED heatsink material?
    Hernandor, et al... ;)=0ASorry forlate note of appreciated advice. Your rep lies had been routed to a seldom opened spam box.=0AThanks again,=0AMike W. =0A=0AFrom: Henador Titzoff <henador_titzoff@yahoo.com>=0A>To: "aeroelectri c-list@matronics.com" <aeroelectric-list@matronics.com> =0A>Sent: Wednesday , April 3, 2013 3:48 PM=0A>Subject: Re: AeroElectric-List: LED heatsink mat erial?=0A>=0A>=0A>=0A>Hello Mike W.,=0A>=0A>=0A>The short answer is copper. - This is evidenced by each material's thermal conductivity, shown below in SI units:=0A>=0A>=0A>---- Copper - 401 Watt/(meter x Kelvin)=0A> ---- Aluminum - 237 Watt/(meter x Kelvin)=0A>---- Stainless steel - 16.7 Watt/(meter x Kelvin)=0A>=0A>=0A>=0A>The above data came from : http://en.wikipedia.org/wiki/List_of_thermal_conductivities=0A>=0A>=0A>Th ermal conductivity is the property of a material to conduct heat. As you ca n see, copper conducts heat 1.7 times better than aluminum and 24 times bet ter than a certain type of stainless steel. There are other things to consi der but since your mounting plate is your reflector and you are stuck with its dimensions, form factor and coating.- If you are looking for the best conductor, copper is the choice.- This also assumes that you are not con cerned with weight or corrosion.=0A>=0A>=0A>Henador Titzoff=0A>=0A>=0A>=0A> =0A>From: "wynaire@citlink.net" <wynaire@citlink.net>=0A>To: "aeroelectric- list@matronics.com" <aeroelectric-list@matronics.com> =0A>Sent: Wednesday, April 3, 2013 4:43 PM=0A>Subject: AeroElectric-List: LED heatsink material? =0A>=0A>=0A>Hello All,=0A>Your thoughts or lessons from experience: =0A>I a m mounting two (2) each 10Watt LED's (R/G color and -white [6500k] in eac h wing tip, under a clear tip lens. The mounting plate (polished for reflec tivity) can be copper or SS or aluminum. Which material is the best choice for conducting the LED heat away from the LED's?=0A>Thanks in advance for y our suggestions. Any other bits of related info are also appreciated.=0A>Mi ke W.=0A>LNC2 360 @ 88% finished... with 88% to go ;)=0A>=0A>=0A>From: Jame s Kilford <james@etravel.org>=0A>>To: aeroelectric-list@matronics.com =0A>> Sent: Wednesday, April 3, 2013 6:31 AM=0A>>Subject: Re: AeroElectric-List: Ebus Diode=0A>>=0A>>=0A>>On a related note, is there a way to determine if a heatsink is large enough? - =0A>>=0A>>=0A>>I made a heatsink out of som e scrap .020" aluminium -- half a dozen pieces of varying lengths, stacked and folded up at the ends to form fins. -I've bolted it under the rectifi er with some heatsink paste. -=0A>>=0A>>=0A>>Seems like quite a lot of al uminium, and plenty of surface area, but it would nice to find a way of eva luating its effectiveness... other than waiting for the smell of burning se miconductor...=0A>>=0A>>=0A>>Many thanks,-=0A>>=0A>>=0A>>James=0A>>=0A>> =0A>>=0A>>On 2 April 2013 16:38, Robert L. Nuckolls, III <nuckolls.bob@aero electric.com> wrote:=0A>>=0A>>At 09:56 AM 4/2/2013, you wrote:=0A>>>=0A>>>T he drawing http://www.bandc.biz/pdfs/Diode_Installation.pdf=0A>>>>From B an d C shows both ~ (I don't have the correct symbol horizontal s with -) term inals powered from the main bus with the + going to the Ebus and - unused. =0A>>>>=0A>>>>Question: I could run power from the main bus to either ~ ter minal and power the Ebus?=0A>>>>=0A>>>>Powering both ~ terminals gains a li ttle redundancy to power the Ebus?=0A>>>- No 'redundancy' just a potentia l tiny improvement in=0A>>>- thermal modeling. Not a big deal one way or another.=0A>>>- Run main bus power to either one or both AC input=0A>>> - terminals, one wire from (+) to e-bus.=0A>>>=0A>>>- Bob . . .=0A>>> =0A>>>=0A>>>- Bob . . . =0A>>>ist" target="_blank">http://www.matronics .com/Navigator?AeroElectric-Listtp://forums.matronics.com_blank">http ========= =0A>=0A>




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