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Strobe light audio noise

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MElrod3732(at)aol.com
Guest

Posted: Sat Aug 26, 2006 11:28 am Post subject: Strobe light audio noise

Hello fellow builders: I mounted the Aero Flash strobe units to the  inside of the seat backs in my 701 running shielded cable to each strobe  light. With the strobe lights on, I can still faintly hear the strobe unit  through my headset.

 I was wondering if anyone else had a similar problem and if it could be  corrected with filters to the power leads.  If so, what type of  filters should I buy and where do I get them?

  

 Thanks in advance,   Mike  Elrod   

  [quote][b]

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cffd(at)pgrb.com
Guest

Posted: Sat Aug 26, 2006 12:54 pm Post subject: Strobe light audio noise

I mounted my strobe power supplies on the spar extension at the wing  tip.  Saves wire weight and I have no strobe noise.  On each wing I  ran one ground wire, one 12 volt wire for strobe, and one 12 volt wire for nav  lite.  I cleared mounting power supplies on the spar extension with  ZAC.

 Chuck D.

 N701TX

  

  

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p.mulwitz(at)worldnet.att
Guest

Posted: Sat Aug 26, 2006 2:20 pm Post subject: Strobe light audio noise

Hi Mike,



 I wouldn't mess around with filters on either the strobe lines or the power to the strobe power supplies.  Rather, I would fool around with ground connections between the power supplies and the ground connection to the radio which exhibits the noise.  The ground for each of these devices should be a separate cable to the battery or single ground point near the engine.



 The theory I am using is that the noise comes from impulses in the ground circuit from the power supplies getting to the ground pin on the radio.



 Other things to play with include checking that the ground on the shield of the wire to the strobe lights is connected only at the power supplies.  I presume there are two conductors inside the shield - a "Light" and "Ground" for each strobe light.  If you use the shield for power return from the strobe light, then there isn't a shield after all.



 One more thing to check is the ground connection from your headset to the radio.  It should be a direct wire connection to the radio or audio panel.  This is definitely not the place to use the aircraft skin as a ground.



 If all else fails, you might consider adding an assortment of capacitors between the power and ground of the radio and/or audio panel to filter the noise from the strobe from getting into the radio or audio amplifier power supply.  The capacitors should include some very small ones (perhaps 100 pF) and some very large ones (perhaps 1,000 mF).  The large ones need to be installed with the correct polarity.  This shouldn't be necessary since the power supply for the radio should already have these built in.



 Good luck,



 Paul

 XL fuselage



 



 [quote]Hello fellow builders: I mounted the Aero Flash strobe units to the inside of the seat backs in my 701 running shielded cable to each strobe light. With the strobe lights on, I can still faintly hear the strobe unit through my headset.

 I was wondering if anyone else had a similar problem and if it could be corrected with filters to the power leads.  If so, what type of filters should I buy and where do I get them?

  

 Thanks in advance,   Mike Elrod   

 

 [b]

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4rcsimmons(at)comcast.net
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Posted: Sat Aug 26, 2006 5:28 pm Post subject: Strobe light audio noise

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