Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

capacitor sizing

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

kesleyelectric(at)chooseb
Guest

Posted: Mon Aug 07, 2006 6:55 am Post subject: capacitor sizing

A friend of mine0 asked if I could come up with a variable voltage source to check the trip rating0 on his homegrown voltage regulator/OV protector.  I have an autotransformer0 that would work well, but the output is AC.  Running through a bridge0 rectifier would be no problem, but I would like to add a capacitor to smooth the0 output waveform.  I do not have an o-scope available, so I am looking for0 suggestions as to capacitor size needed.  Any help0 appreciated.

  

 Tom0 Barter

 Kesley,0 IA

- 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

klehman(at)albedo.net
Guest

Posted: Mon Aug 07, 2006 10:18 am Post subject: capacitor sizing

Hi Tom



I'd suggest the largest electrolytic capacitor that you have sitting 

around. Pretty much anything should work since the gate draws little 

current. You might need a load resistor to help bleed the capacitor 

voltage off when reducing the voltage.



Another way might be to just to add a couple of 1.5 volt flashlight 

batteries in series with the main battery.  Or for more precision you 

could also use a variable resistor across one or more of the extra 

batteries to tap off a variable voltage.



Ken



kesleyelectric wrote:



 	  Quote: 	
		   A friend of mine asked if I could come up with a variable voltage 

 source to check the trip rating on his homegrown voltage regulator/OV 

 protector.  I have an autotransformer that would work well, but the 

 output is AC.  Running through a bridge rectifier would be no problem, 

 but I would like to add a capacitor to smooth the output waveform.  I 

 do not have an o-scope available, so I am looking for suggestions as 

 to capacitor size needed.  Any help appreciated.

  

 Tom Barter

 Kesley, IA

- 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

brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Mon Aug 07, 2006 12:02 pm Post subject: capacitor sizing

On Aug 7, 2006, at 10:53 AM, kesleyelectric wrote:



 	  Quote: 	
		   A friend of mine asked if I could come up with a variable voltage  

 source to check the trip rating on his homegrown voltage regulator/ 

 OV protector.  I have an autotransformer that would work well, but  

 the output is AC.  Running through a bridge rectifier would be no  

 problem, but I would like to add a capacitor to smooth the output  

 waveform.  I do not have an o-scope available, so I am looking for  

 suggestions as to capacitor size needed.  Any help appreciated.


	


Why don't you just borrow a variable voltage DC power supply from  

someone?



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

- 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

_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

nuckollsr(at)cox.net
Guest

Posted: Tue Aug 08, 2006 6:22 am Post subject: capacitor sizing

At 04:01 PM 8/7/2006 -0400, you wrote:



 	  Quote: 	
		  

On Aug 7, 2006, at 10:53 AM, kesleyelectric wrote:



>A friend of mine asked if I could come up with a variable voltage

>source to check the trip rating on his homegrown voltage regulator/ OV 

>protector.  I have an autotransformer that would work well, but

>the output is AC.  Running through a bridge rectifier would be no

>problem, but I would like to add a capacitor to smooth the output

>waveform.  I do not have an o-scope available, so I am looking for

>suggestions as to capacitor size needed.  Any help appreciated.



Why don't you just borrow a variable voltage DC power supply from

someone?


	




    Good idea. Everyone should have a small, metered bench

    supply for such tasks. They're very handy. I've got probably

    a half dozen supplies of various capacities. A particularly

    good value right now is offered by Marlin P. Jones at:



http://mpja.com/productview.asp?product=14600+PS



    They're out of stock on this one right now but should

    have more shortly.



        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

brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue Aug 08, 2006 9:48 am Post subject: capacitor sizing

On Aug 8, 2006, at 10:19 AM, Robert L. Nuckolls, III wrote:



 	  Quote: 	
		  > Why don't you just borrow a variable voltage DC power supply from

> someone?

    Good idea. Everyone should have a small, metered bench

    supply for such tasks. They're very handy. I've got probably

    a half dozen supplies of various capacities. A particularly

    good value right now is offered by Marlin P. Jones at:



 http://mpja.com/productview.asp?product=14600+PS



    They're out of stock on this one right now but should

    have more shortly.


	


Here is a 25A lightweight switcher that should be able to run most of  

your aircraft electrical system for testing. Wire it to your  

alternator's B-lead so you can test everything.



http://www.mfjenterprises.com/products.php?prodid=MFJ-4225MV

Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

- 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

sportav8r(at)gmail.com
Guest

Posted: Tue Aug 08, 2006 10:34 am Post subject: capacitor sizing

Bob,

 Jumping in a little late here on this concept; I am going to put an SD-8 into my flying RV later on for Z-13/8-style redundancy.  I caught some discussion about the little dynamo not being self-exciting without the added Z-25 circuitry.  I'm trying to understand what failure mode would cause the SD-8 not to be connected to the battery and getting its excitation from that source.  Wired as per Z-13/8, it seems the battery is always available to the alternator via the S-704-1 relay.  Are we addressing a scenario where the battery itself is taken all the way down so that it cannot close the relay?  That just seems really remote to me. 

 Thanks for clearing this up for me, as I know you will 

 -Bill B

 On 8/8/06, Robert L. Nuckolls, III <nuckollsr(at)cox.net (nuckollsr(at)cox.net)> wrote:  	  Quote: 	
		  --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" < nuckollsr(at)cox.net (nuckollsr(at)cox.net)>

At 04:01 PM 8/7/2006 -0400, you wrote:

 	  Quote: 	
		  --> AeroElectric-List message posted by: Brian Lloyd <brian-yak(at)lloyd.com (brian-yak(at)lloyd.com)>

On Aug 7, 2006, at 10:53 AM, kesleyelectric wrote:

>A friend of mine asked if I could come up with a variable voltage

>source to check the trip rating on his homegrown voltage regulator/ OV 

>protector.  I have an autotransformer that would 8work well, but

>the output is AC.  Running through a bridge rectifier would be no

>problem, but I would like to add a capacitor to smooth the output 

>waveform.  I do not have an o-scope available, so I am looking for

>suggestions as to capacitor size needed.  Any help appreciated.

Why don't you just borrow a variable voltage DC power supply from 

someone?

   Good idea. Everyone should have a small, metered bench

   supply for such tasks. They're very handy. I've got probably

   a half dozen supplies of various capacities. A particularly

    good value right now is offered by Marlin P. Jones at:

http://mpja.com/productview.asp?product=14600+PS

   They're out of stock on this one right now but should 

   have more shortly.

       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

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum