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Electroluminescent hum

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N941WR

Joined: 01 May 2006
Posts: 21

Posted: Thu Oct 26, 2006 4:19 am Post subject: Electroluminescent hum

I have installed an electroluminescent strip to light the switch panel in my RV-9 and this has introduced a low volume hum in the intercom.



Do any of you have a suggestion on how to eliminate this?



My set up is as follows:  (And what I have tried)

- All grounds go to a common ground bus, mounted on the inside of the firewall, which is bolted through the firewall to the engine ground bus and negative battery cable.

- The positive lead from the EL power supply is wired in to an Aero Bob dimmer.

- I have removed power to the power supply and the hum goes away.

- I have moved the wires to the power supply

- I have wrapped the power supply in tinfoil

- I have temporarily installed a noise suppressor in the avionics bus feed line.

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_________________
Bill

cjensen(at)dts9000.com
Guest

Posted: Thu Oct 26, 2006 5:05 am Post subject: Electroluminescent hum

Bill, 

I had a similar problem and applied two fixes.  First, all wires were

returned to the same ground...not looping or daisy-chaining.  Second,

the wires to/from the strip were aggressively twisted.  I'm unsure which

was the final solution as both were applied when the problem was fixed.

It's a couple things to try.



Chuck Jensen

 

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N941WR

Joined: 01 May 2006
Posts: 21

Posted: Thu Oct 26, 2006 12:52 pm Post subject: Re: Electroluminescent hum

Chuck,



Thanks for the input.  Unfortunately, I had already done both of those things.



I might try re-routing the wires between the power converter and the strips.  (I'm running duel strips since I have a center mounted throttle quadrant in my -9.)

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_________________
Bill

cjensen(at)dts9000.com
Guest

Posted: Thu Oct 26, 2006 1:21 pm Post subject: Electroluminescent hum

I was running dual strips as well as a number of instrument lights.  The

first installation groups the grounds together from a few of the items,

then ran one long lead over to the ground on the converter.  Running all

of the grounds back to the converter...as well as doing a Mr. Twister on

them, was the fix.  Nonetheless, fiddling with them can sometimes affect

a cure, just like fiddling with them will sometimes initiate the

problem.  There is a lot of black magic involved in this stuff (at least

for us uneducated electrical types!).



Chuck Jensen

 

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