Re: Is there another type of cap that looks like electrolytic but behaves differ
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----- Original Message ----- From: "rtstofer" <rstofer@...> To: <Electronics_101@...> Sent: Thursday, May 04, 2006 8:19 PM Subject: [Electronics_101] Re: Is there another type of cap that looks like electrolytic but behaves differ --- In Electronics_101@..., "lcdpublishing" <lcdpublishing@...> wrote:
Hi Guys,
I am losing a lot of hair on this one.
I have two PCBs that both have MAX232 chips. One is a cpe the other
has an N suffix. That part really doesn't matter as I have swapped
the chips back and forth (they are in sockets) a number of times and
the problem doesn't follow.
Both PCBs have 10 uf caps. One boad has caps from Radio shack - it
works. The other board has caps from Jameco or Digikey, not sure.
Either way, they ARE marked 10uf 50V.
For both devices, the proper value for the capacitors is 1 ufd, not 10 ufd. For the MAX232N: pin 2 should be +8.5V and pin 6 should be -8.5V if the charge pumps are working. For the MAX232CPE: the datasheet says +10V and -10V on the same pins. 10 uF will be OK. The non-working ones might be tantalum, the line on them sometimes indicates the +ve lead. Leon --- [This E-mail has been scanned for viruses but it is your responsibility to maintain up to date anti virus software on the device that you are currently using to read this email. ]
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