AeroElectric-List Digest Archive

Sat 09/29/18


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 05:27 AM - Re: Battery Minder connector (donjohnston)
     2. 10:04 AM - Re: LED Noise Filter (Robert L. Nuckolls, III)
     3. 01:53 PM - Re: LED Noise Filter (Sebastien)
     4. 08:39 PM - Re: LED Noise Filter (Robert L. Nuckolls, III)
     5. 09:13 PM - Re: LED Noise Filter (Sebastien)
 
 
 


Message 1


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    Time: 05:27:21 AM PST US
    Subject: Re: Battery Minder connector
    From: "donjohnston" <don@velocity-xl.com>
    moosepileit wrote: > BatteryMINDer EZC-01 Universal Flush-Mountable EZ Connector - with 4 Mounting Screws > > $15 on Amazon Bingo!!! Thanks Moose! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=483433#483433


    Message 2


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    Time: 10:04:31 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: LED Noise Filter
    At 11:19 PM 9/28/2018, you wrote: >=EF=BB >Barry, > > << It is correct the way it is. >> > >My "small" change does not change the >schematic. In both cases C2 & C3 are parallel >and on the LED side of the inductor. From a >noise suppression viewpoint believe people >should be aware that shorter leads are best for >high frequencies. In a severe case I would >consider soldering the high frequency capacitor at the LED leads. What is the nature of the noise being mitigated? Who is the victim? How does it manifest in operation of the victim? Noise comes in a constellation of flavors, sources, intensity and remedies. The filters I built for the LED fixtures were specific to an observed interference in the VHF Comm and VOR audio when the LED position lights powered with the constant current generators were turned on. Without knowing more details as to this particular recipe, any cut-n-try endeavors are simply experiments which may . . . or may not fix the observed problem. As a general rule, electrolytic capacitors are of no noise suppression value. Other reactive components (capacitors, inductors) need to be scaled for effective attenuation at the frequency(ies) of interest. For the purposes of this particular discussion, which of the ship's systems are complaining about operation of the LED assembly? Bob . . .


    Message 3


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    Time: 01:53:43 PM PST US
    From: Sebastien <cluros@gmail.com>
    Subject: Re: LED Noise Filter
    VHF Radio. Basically background static. On some of the lights it's barely noticeable and you have to listen carefully to hear it, on at least one light it creates enough VHF noise to break squelch on the radio and creates a very noticeable amount of static. On Sat, Sep 29, 2018, 10:08 Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 11:19 PM 9/28/2018, you wrote: > > =C3=AF=C2=BB=C2 > > Barry, > > << It is correct the way it is. >> > > My "small" change does not change the schematic. In both cases C2 & C3 > are parallel and on the LED side of the inductor. From a noise suppressi on > viewpoint believe people should be aware that shorter leads are best for > high frequencies. In a severe case I would consider soldering the high > frequency capacitor at the LED leads. > What is the nature of the noise being mitigated? > Who is the victim? How does it manifest in operation > of the victim? > > Noise comes in a constellation of flavors, sources, > intensity and remedies. The filters I built for > the LED fixtures were specific to an observed > interference in the VHF Comm and VOR > audio when the LED position lights powered with > the constant current generators were turned on. > > Without knowing more details as to this > particular recipe, any cut-n-try endeavors > are simply experiments which may . . . or may > not fix the observed problem. > > As a general rule, electrolytic capacitors > are of no noise suppression value. Other > reactive components (capacitors, inductors) > need to be scaled for effective attenuation > at the frequency(ies) of interest. > > For the purposes of this particular discussion, > which of the ship's systems are complaining about > operation of the LED assembly? > > > Bob . . . >


    Message 4


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    Time: 08:39:04 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: LED Noise Filter
    At 03:52 PM 9/29/2018, you wrote: >VHF Radio. Basically background static. On some of the lights it's >barely noticeable and you have to listen carefully to hear it, on at >least one light it creates enough VHF noise to break squelch on the >radio and creates a very noticeable amount of static. Okay, and what is the LED product we're talking about? Have you had any conversation wthe the manufacturer? Bob . . .


    Message 5


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    Time: 09:13:13 PM PST US
    From: Sebastien <cluros@gmail.com>
    Subject: Re: LED Noise Filter
    https://www.amazon.com/gp/product/B01KJ94Q1K/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 If they were the +$300 ones made for aircraft I would call the manufacturer but these are 15% of the price of the aviation ones so I understand why the builder chose them. If we can fix this for $20 worth of parts it makes sense to me. On Sat, Sep 29, 2018 at 8:43 PM Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 03:52 PM 9/29/2018, you wrote: > > VHF Radio. Basically background static. On some of the lights it's barely > noticeable and you have to listen carefully to hear it, on at least one > light it creates enough VHF noise to break squelch on the radio and creates > a very noticeable amount of static. > > > Okay, and what is the LED product we're talking about? > Have you had any conversation wthe the manufacturer? > > > Bob . . . >




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