Haha, thanks everyone for the detailed info! For now, I just stuck in a 10 uF + 0.1 uF until I buy some 1 uF. The thing also works perfectly without any capacitor at all, but that's probably because I'm powering it from USB. I never intended to question the datasheet. I just wanted to know what was the reasoning behind the 1 uF choice since everyone keeps telling me to use 0.1 uF. I also wanted to know if there was an alternative since I did not have any 1 uF caps available. Also, I wonder why my very simple topics always get so long, deep and sometimes violent :P Anyway, thanks again to all! My MAX233A works beautifully! I love being able to program and test while viewing output without touching my device. Development goes far more rapidly! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist