TTL wiring rule number one;

All inputs should go somewhere.




CMOS wiring rule number one;

All inputs must go somewhere.


The problem with sayzer's circuit is that it will not work for max232epe chips , they will get hot real hot

the switching caps need to be ten times smaller 0.1uF

http://www.picbasic.co.uk/forum/showthread.php?t=19548