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#1
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CAPACITOR QUESTION
If my question seems stupid it is because I am new to this and trying my
best to learn how to make repairs to some basic boards. OK Here goes: I had to replace two barrel type capacitors on a control board for a pinball machine. The capacitors were marked 470mfd35v and I replaced them with nichion 470uf35v. I read that you had to reform capacitors when replacing them. It that true for brand new capacitors or just used ones. Please email Thanks for your help Dennis |
#2
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CAPACITOR QUESTION
Modern caps don't require reforming after a prolonged period of
storage in a discharged state. Don't sweat it (unless you have some truly old caps and plan to work them close to their maximum voltage rating). On Thu, 31 Jul 2003 13:00:04 GMT, "Dennis Bush" wrote: If my question seems stupid it is because I am new to this and trying my best to learn how to make repairs to some basic boards. OK Here goes: I had to replace two barrel type capacitors on a control board for a pinball machine. The capacitors were marked 470mfd35v and I replaced them with nichion 470uf35v. I read that you had to reform capacitors when replacing them. It that true for brand new capacitors or just used ones. Please email Thanks for your help Dennis -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
#3
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CAPACITOR QUESTION
One is 470 microfarads will the other is 470 MILLIfarads... that's a
huge difference....you might want to check that...I know that doesn't answer your original question "Dennis Bush" wrote in message ws.com... If my question seems stupid it is because I am new to this and trying my best to learn how to make repairs to some basic boards. OK Here goes: I had to replace two barrel type capacitors on a control board for a pinball machine. The capacitors were marked 470mfd35v and I replaced them with nichion 470uf35v. I read that you had to reform capacitors when replacing them. It that true for brand new capacitors or just used ones. Please email Thanks for your help Dennis |
#4
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CAPACITOR QUESTION
mfd and ufd are both read as Microfarad not "milli" Mfd is the older
designation. On 31 Jul 2003 10:12:04 -0700, (miketinte) wrote: One is 470 microfarads will the other is 470 MILLIfarads... that's a huge difference....you might want to check that...I know that doesn't answer your original question -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
#5
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CAPACITOR QUESTION
One is 470 microfarads will the other is 470 MILLIfarads...
I doubt that. The m is often misused to indicate micro. And a 470 millifarad cap would be huge! Wouter van Ooijen -- ------------------------------------ http://www.voti.nl PICmicro chips, programmers, consulting |
#6
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CAPACITOR QUESTION
On Thu, 31 Jul 2003 22:04:10 -0400, "Robert Morein"
wrote: That's news to me. I recently looked at a manufacturer's website. After two years, specs are not met without reforming. Interesting. Prompted me to take out several of my stock of electrolytics. 100uf to 1000 uf range. I measured capacity and all were over the marked value, some by 200%. Applied the rated working voltage in one go from a brute force PS (no regulator and level set by the input variac). Applied voltage and charged them and no problems. Left several of the same voltage on for hours with no failures. Gave a few a harsher test by shorting the cap and supply. That gives a spike of ~20% higher with my lash-up when the voltage returns. Maybe the makers are covering their ass with the specs? Or perhaps they meet some ambient temperature or ripple current spec while testing. Some of my caps are over 20 years old. The oldest did have lower capacity versus fresh ones, but they were still over the rated values but no 200% ones. Which website? I'd be curious to see which specs they mean. Tantelum electrolytics may be a different case, Ive seen those fail, but no aluminum electrolytics. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
#7
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CAPACITOR QUESTION
Wow you folks really have me confused now. The original board and capacitor
was made in early 1970 and are clearly marked nichion 470mfd35v. Now I went to several electronic suppliers and cannot find a 470mfd35v(millifarad) in a aluminum axial type capacitor which make me wonder now is it a microfarad marked mfd according to older standards or not. Man am I confused. Dennis "Wouter van Ooijen (www.voti.nl)" wrote in message ... One is 470 microfarads will the other is 470 MILLIfarads... I doubt that. The m is often misused to indicate micro. And a 470 millifarad cap would be huge! Wouter van Ooijen -- ------------------------------------ http://www.voti.nl PICmicro chips, programmers, consulting |
#8
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CAPACITOR QUESTION
No need for confusion, was the replacement caps 1000 times the
physical size of the originals or not? There in lies your clue. mfd has always meant microfarad as has uf, don't let the doofus scare you so easy. If you want to talk millifarad you do it like this - 470,000,000uf. So it still comes down to microfarads. "Dennis Bush" wrote in message ws.com... Wow you folks really have me confused now. The original board and capacitor was made in early 1970 and are clearly marked nichion 470mfd35v. Now I went to several electronic suppliers and cannot find a 470mfd35v(millifarad) in a aluminum axial type capacitor which make me wonder now is it a microfarad marked mfd according to older standards or not. Man am I confused. Dennis "Wouter van Ooijen (www.voti.nl)" wrote in message ... One is 470 microfarads will the other is 470 MILLIfarads... I doubt that. The m is often misused to indicate micro. And a 470 millifarad cap would be huge! Wouter van Ooijen -- ------------------------------------ http://www.voti.nl PICmicro chips, programmers, consulting |
#9
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CAPACITOR QUESTION
No manufacturer has EVER labelled a cap in millifarads.
m is the antiquated designation for mico. ....I know ! On Fri, 01 Aug 2003 07:29:02 -0700, DarkMatter wrote: On 31 Jul 2003 10:12:04 -0700, (miketinte) Gave us: One is 470 microfarads will the other is 470 MILLIfarads... that's a huge difference....you might want to check that...I know that doesn't answer your original question It would also be over ten times bigger physically. DOH! |
#10
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CAPACITOR QUESTION
I take it that the ufd is actually µfd then?
Haven't been in this for a while now and I still look for mmfd on caps. (hope the news readers don't kill my old DOS keypad stuff....) On Thu, 31 Jul 2003 16:03:18 -0400, default wrote: mfd and ufd are both read as Microfarad not "milli" Mfd is the older designation. On 31 Jul 2003 10:12:04 -0700, (miketinte) wrote: One is 470 microfarads will the other is 470 MILLIfarads... that's a huge difference....you might want to check that...I know that doesn't answer your original question ~~~~~~ Bait for spammers: root@localhost postmaster@localhost admin@localhost abuse@localhost ] ~~~~~~ Remove "spamless" to email me. The spam was just getting overwhelming. I had to... |
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