---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/28/18: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:17 PM - Re: Alternator/shunt question (woxofswa) 2. 06:08 PM - Re: Re: Alternator/shunt question (Robert L. Nuckolls, III) 3. 07:32 PM - Re: LED Noise Filter (FLYaDIVE) 4. 09:20 PM - Re: LED Noise Filter (The Kuffels) ________________________________ Message 1 _____________________________________ Time: 04:17:00 PM PST US Subject: AeroElectric-List: Re: Alternator/shunt question From: "woxofswa" Score one for team Sparky. I was able to get my system running correctly by dialing up the internal voltage adjustment screw on the external regulator by 5 - 1/2 turns (2.5 complete turns). On a test flight today at 2400 RPM, I had two SkyView Screens and full associated systems, Dynon com, xponder, ADS-B, audio panel, G430W, all exterior lights, and even the A/C blower on medium, and the standby Alt kept the bus voltage above 13 and after about 2 mins of minus 2, then minus 1, the ammeter held zero battery consumption. Turning the standby ALT off, the ammeter showed minus 27, and back on, it went to positive 2 for about 5 minutes before going back to zero with the bus voltage at 13.4, carrying the ships load and still charging the battery! Thanks for the help! -------- Myron Nelson Mesa, AZ Flew May 10 2014 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=483426#483426 ________________________________ Message 2 _____________________________________ Time: 06:08:14 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Alternator/shunt question At 06:16 PM 9/28/2018, you wrote: > >Score one for team Sparky. I was able to get my >system running correctly by dialing up the >internal voltage adjustment screw on the >external regulator by 5 - 1/2 turns (2.5 complete turns). > >On a test flight today at 2400 RPM, I had two >SkyView Screens and full associated systems, >Dynon com, xponder, ADS-B, audio panel, G430W, all exterior lights, and >even the A/C blower on medium, and the standby >Alt kept the bus voltage above 13 and after >about 2 mins of minus 2, then minus 1, the >ammeter held zero battery consumption. Turning >the standby ALT off, the ammeter showed minus >27, and back on, it went to positive 2 for about >5 minutes before going back to zero with the bus >voltage at 13.4, carrying the ship=99s load and still charging the battery! Good data but with one caveate . . . 13.4 will not CHARGE a battery. It will sustain the current level of charge but it does not add to that level. The rationale for picking such a setting was predicated on the fact that the standby alternator was incapable of carrying normal system running loads . . . however, a judicious load analysis would let the operator select a suite of hardware that would facilitate comfortable en route flight operations. The depressed set point deliberately prevents taxing the limited alternator output with battery charging thus maximizing energy for the operation of electro-whizzies. When the airport is in sight, additional loads useful for decent and approach to landing can be energized using what ever energy is available from the battery. Bottom line is that if your bus is 14.2 to 14.6 with the main alternator and 13.4 to 13.6 on the aux alternator, then BOTH alternators are supporting present loads at voltages established by design goals. Bob . . . ________________________________ Message 3 _____________________________________ Time: 07:32:26 PM PST US From: FLYaDIVE Subject: Re: AeroElectric-List: LED Noise Filter Tom: It is correct the way it is. The 1000 uF Cap is a brute force filter. It filters the DC of the battery. The 1 uF and they may even be too big (I'm thinking .01 uF) are to filter the noise to ground from the component that is creating the noise... The LED Light. BTW, the 1 Hz noise... You will NOT hear it. Way below human ear range. Barry On Thu, Sep 27, 2018 at 1:23 PM The Kuffels wrote: > Sebastien, > > << The only circuit diagram I found online was > > http://www.ptcaviation.com/wordpress/pi-filter/ > > Should I go with a simple 1 inductor 1 capacitor filter for each light or > the more complicated version diagrammed above >> > > The extra cost of the pi filter is so small I would just use them without > even trying a test of the simpler circuit. > > One really small correction on the above diagram. C1 and C2 are to filter > high frequency noise while C3 is for lower frequencies. The leads from the > LED to the first high frequency capacitor should be as short as possible. > Therefore, the positions of C2 and C3 on the diagram should be swapped. > > Tom Kuffel > > > Virus-free. > www.avast.com > > <#m_6075612159170557049_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > ________________________________ Message 4 _____________________________________ Time: 09:20:19 PM PST US From: "The Kuffels" Subject: Re: AeroElectric-List: LED Noise Filter 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 vi ewpoint believe people should be aware that shorter leads are best for high frequencies. In a severe case I would consider soldering the high frequen cy capacitor at the LED leads. << The 1 uF and they may even be too big (I'm thinking .01 uF) are to filt er the noise to ground from the component that is creating the noise... >> Believe that is what I said. Agree the 1 uF value seems too high. Persona lly would use no more than 0.1 uF and thought 0.01 uF would be the place to start. But for all I know, the circuit designer experimented and found th is type of 1 uF capacitor to work best with this LED. So I limited my comm ent to the teaching point that the length of leads carrying high frequency noise should be as short as reasonable. Tom --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- 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.