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Old 5th January 2006, 07:19 AM   #1
AndrewT is offline AndrewT  Scotland
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Question Reforming capacitors?

Hi,
I am reforming capacitors for the smoothing banks of a variety of amps. Most are new old stock 2 to 3 year old. Some are much older and been out of use for 8 years.

Can I reform upto working voltage with a 1M2 series resistor without any risk?

Can I use a higher charging voltage and take the caps off charge when they reach working voltage?
Is there a risk of not reforming properly if the charge period is shortened to less than 24hrs or 12hrs?

Can I reform, slowly, to higher than working voltage, IF the reforming current stays low?
I'm thinking working voltage +10% through 1M2 resistor.
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Old 5th January 2006, 07:25 AM   #2
lineup is offline lineup  Sweden
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Location: the north
I didnt know you can reform caps.

I found this article
Steven W. Moore - Reforming Capacitors

At bottom of his page are two reference links, about same subject.

more links:
http://ed-thelen.org/1401Project/Tri...apacitors.html
http://www.chemi-con.com/u7002/toc.php
http://www.vmars.org.uk/capacitor_reforming.htm
http://www.angelfire.com/electronic/...store_cap.html

.... and from USA

DEPARTMENT OF DEFENSE
HANDBOOK FOR
STORAGE SHELF LIFE AND
REFORMING PROCEDURES FOR
ALUMINUM ELECTROLYTIC FIXED CAPACITORS
http://www.dscc.dla.mil/Programs/Mil...=MIL-HDBK-1131
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Old 23rd March 2008, 05:21 PM   #3
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I see we have a lot of threads on reforming caps but I
have another question. Can you reform a bipolar cap?
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