MAX232 issue...

A

Adam Bradley

Guest
Having an issue configuring a MAX232 chip (I know - there's not much to it!)
I'm using a 7.5V 1A DC plugpack regulated by a 78l05 -
http://members.optushome.com.au/adambradley/electronics/MAX232/78l05-5V%201A
%20source.JPG

Chip is configured as per datasheet
http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20data
sheet.jpg

on a breadboard
http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
breadboard.jpg

Pin 2 reads +4.71V (I believe this should be +10V)
http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%202%20(should%20be%20+10V).jpg

Pin 6 reads 1.32V...
http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%206%20(should%20be%20-10V).jpg

down to 0.73V after a couple of seconds
http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%206%20after%203%20seconds.jpg

Any ideas?
Thanks in advance!
Adam
 
Pin 15 - Ground - fixed!

"Adam Bradley" <adam_j_bradley@yahoo.com> wrote in message
news:3f1e8ba3$0$3863$afc38c87@news.optusnet.com.au...
Having an issue configuring a MAX232 chip (I know - there's not much to
it!)
I'm using a 7.5V 1A DC plugpack regulated by a 78l05 -

http://members.optushome.com.au/adambradley/electronics/MAX232/78l05-5V%201A
%20source.JPG

Chip is configured as per datasheet

http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20data
sheet.jpg

on a breadboard

http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
breadboard.jpg

Pin 2 reads +4.71V (I believe this should be +10V)

http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%202%20(should%20be%20+10V).jpg

Pin 6 reads 1.32V...

http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%206%20(should%20be%20-10V).jpg

down to 0.73V after a couple of seconds

http://members.optushome.com.au/adambradley/electronics/MAX232/MAX232%20-%20
pin%206%20after%203%20seconds.jpg

Any ideas?
Thanks in advance!
Adam
Click to expand...
 
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