Bottlehead Forum

General Category => General Discussion => Topic started by: jminassi on March 13, 2021, 06:32:42 PM

Title: Capacitors
Post by: jminassi on March 13, 2021, 06:32:42 PM

Hi,

I have a technical question about the value of an electrolytic capacitor.  I have a board with a cap that reads
220 u-M.  That cap needs to be replaced.  I have a new cap on hand rated the same voltage and temperature, but the capacitance is designated as 220 uF.  Are these capacitors the same value?

Any help would be appreciated.

Thanks,

John

Title: Re: Capacitors
Post by: Paul Birkeland on March 14, 2021, 07:09:48 AM

Can you post a picture of the cap in question?  You are very likely correct, but stranger things have happened...

Title: Re: Capacitors
Post by: jminassi on March 14, 2021, 07:38:16 AM

PB,  the old capacitor is on the left, the new on the right.

Thanks,

John

Title: Re: Capacitors
Post by: Paul Birkeland on March 14, 2021, 07:54:18 AM

That image is postage stamp sized.

Title: Re: Capacitors
Post by: jminassi on March 14, 2021, 08:14:51 AM

Wow, it looked gigantic on my end.  I'll try re-sizing it.

John

Title: Re: Capacitors
Post by: jminassi on March 14, 2021, 08:34:27 AM

PB,

I apparently grabbed a thumbnail the first time.  Try this.


Thanks,

John

Title: Re: Capacitors
Post by: Paul Birkeland on March 14, 2021, 09:09:45 AM

That indeed looks like a 220uF cap.

If the old cap died, possibly from excess ripple current, I wouldn't put in something physically smaller.  Perhaps consider a 50V or 63V cap as a substitute that's a little more substantial, especially if that new cap you have is a Panasonic FC.

Title: Re: Capacitors
Post by: jminassi on March 14, 2021, 10:23:28 AM

Thanks PB!