[Milsurplus] AN/GRR-5 Power Supply Questions

[Lloyd KK7IZ]

Not only that, I have a quantity if new AT&T capacitors that clearly state 
working voliage as a range of voltages fer instance 2 uf 10-200 vdc, 5 uf 
1-100 vdc.
Thanx
Lloyd  KK7IZ
kk7iz at cox.net

Lloyd Godsey  KK7IZ
1315 N. Udall Circle
Mesa, Az  85203
480-620-7145 (cell)
Visit my  web site
www.lloydsdipsydumpster.com
PAYPAL welcome
And my NEW  web sites
www.antiqueradioarchives.com
www.antiqueaircraftradios.com
Collecting OLD civilian aircraft radios and literature
Particularly Lear. Got anything?
Some boatanchors got wings

----- Original Message ----- 
From: "James Duffer" <dufferjames at hotmail.com>
To: <neilba at clear.net.nz>; <Milsurplus at mailman.qth.net>
Sent: Tuesday, August 22, 2006 4:17 AM
Subject: Re: [Milsurplus] AN/GRR-5 Power Supply Questions


>I like it when an answer includes the reference plus some clarification. 
>Thanks for straighten that issue out.  I had heard that applied voltage has 
>some affect on capacitance of electrolytics.
>
> Jim de wd4air
>
>
>>From: Neil Barnett <neilba at clear.net.nz>
>>To: milsurplus <Milsurplus at mailman.qth.net>
>>Subject: Re: [Milsurplus] AN/GRR-5 Power Supply Questions
>>Date: Tue, 22 Aug 2006 20:54:30 +1200
>>
>>----- Original Message ----- From: "WF2U"
>>
>>>ABSOLUTELY not true! The voltage rating of electrolytic capacitors, just
>>>like that of any other capacitor indicates the insulation level between 
>>>the
>>>two electrodes which form the capacitance.
>>
>>Electrolytics differ from ceramic, polyester, and similar capacitors
>>in that they *require* an applied DC voltage to form and maintain
>>the dielectric, in a complex chemical action.  If you don't apply a
>>certain minimum DC voltage, the electrolytic capacitor won't reach
>>its rated capacitance.  To ensure that it does, the applied voltage
>>should be not less than about two-thirds of the marked Working
>>Voltage.
>>
>>>"Forming" an electrolytic capacitor also has
>>>nothing to do with "attaining their full capacitance".
>>
>>Here's what the ARRL Handbook (1995) says:  "The actual
>>dielectric is a very thin film of insulating material that forms on one
>>set of plates through electrochemical action when a dc voltage is
>>applied to the capacitor."   (page 6.9).
>>
>>And, "Electrolytics should not be used if the d.c. potential is well
>>below the capacitor working voltage."   (page 10.5).
>>
>>And the 1992 Handbook says:  "A dielectric is "formed" by the
>>voltage applied to the capacitor.  As a consequence, electrolytics
>>should not be used where the dc potential is well below the capacitor
>>working voltage."   (page 26.22).
>>
>>73 de Neil ZL1ANM
>>
>>______________________________________________________________
>>Milsurplus mailing list
>>Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>>Help: http://mailman.qth.net/mmfaq.htm
>>Post: mailto:Milsurplus at mailman.qth.net
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>