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nuckollsr(at)cox.net
Guest

Posted: Mon Jul 10, 2006 6:51 pm Post subject: AeroElectric-List Digest: 6 Msgs -

At 06:05 PM 7/10/2006 -0400, you wrote:



 	  Quote: 	
		   >As you have guess and from your description they are FEED-THROUGH 

 Capacitors.

 >Their value is probably in the range of .001 to .01 uF at 20 VDC (WVDC) or

 >more.  The voltage should be MORE than the system voltage by 50% and if you

 >find one at 100 VDC (WVDC) you can use that also ... Not critical.



 >I'm not understanding your description about the other item.  That sounds

 >like an Electrolytic capacitor (Polarized ... + & - leads) that is 

 hooked between



 >the 'S' terminal of the ACU and Ground.  It's purpose is to filter out 

 NOISE

 >& Spikes.  The value of that can be anywhere from say 25,000 uF to 

 200,000 uF

 >and of course the voltage rating should be as described above.



Everyone:



Thanks for the reply, I did not do a good job of describing the second 

cylinder that looks like a cap. It has a terminal on each end. One is 

connected to the regulator and the other is connected to the alternator. 

It had a wire that went into the bakelite on one end that was connected to 

the airplane frame ground. I am guessing it is also to eliminate noise. 

Does anyone have an idea where I can buy these?



Thanks for all of the help.


	


  Try running without them and see what happens. Do you

  fly with and ADF much? Most of those caps were added

  to reduce if not eliminate alternator noise in the ADF.

  If you don't fly with ADF, then perhaps you don't even need

  them.



  If it turns out that you do need them, it's unlikely that

  you'll find an exact match in anyone's aviation stock. That

  style of filter has become rare. There are some surplus

  houses with New Old Stock that might offer a substitute

  with satisfactory performance to the task. See:



http://www.surplussales.com/Feedthrus/FTflangeMt.html



  Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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nuckollsr(at)cox.net
Guest

Posted: Tue Jul 11, 2006 5:29 am Post subject: AeroElectric-List Digest: 6 Msgs -

At 06:05 PM 7/10/2006 -0400, you wrote:



 	  Quote: 	
		   >As you have guess and from your description they are FEED-THROUGH 

 Capacitors.

 >Their value is probably in the range of .001 to .01 uF at 20 VDC (WVDC) or

 >more.  The voltage should be MORE than the system voltage by 50% and if you

 >find one at 100 VDC (WVDC) you can use that also ... Not critical.



 >I'm not understanding your description about the other item.  That sounds

 >like an Electrolytic capacitor (Polarized ... + & - leads) that is 

 hooked between



 >the 'S' terminal of the ACU and Ground.  It's purpose is to filter out 

 NOISE

 >& Spikes.  The value of that can be anywhere from say 25,000 uF to 

 200,000 uF

 >and of course the voltage rating should be as described above.



Everyone:



Thanks for the reply, I did not do a good job of describing the second 

cylinder that looks like a cap. It has a terminal on each end. One is 

connected to the regulator and the other is connected to the alternator. 

It had a wire that went into the bakelite on one end that was connected to 

the airplane frame ground. I am guessing it is also to eliminate noise. 

Does anyone have an idea where I can buy these?



Thanks for all of the help.


	


  Try running without them and see what happens. Do you

  fly with and ADF much? Most of those caps were added

  to reduce if not eliminate alternator noise in the ADF.

  If you don't fly with ADF, then perhaps you don't even need

  them.



  If it turns out that you do need them, it's unlikely that

  you'll find an exact match in anyone's aviation stock. That

  style of filter has become rare. There are some surplus

  houses with New Old Stock that might offer a substitute

  with satisfactory performance to the task. See:



http://www.surplussales.com/Feedthrus/FTflangeMt.html



  Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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