I downloaded the datasheet for MAX232A (from farnell) and it seems that I need 5x0.1uF capacitors to make this chip happy. I was just wondering if I should choose electrolytic type capacitors or will=20 anything do, since 0.1u is 100n, which is small even when it is not electrolytic. tia. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist