Hi all, mistakenly I used super cap reverse polarity so + pin is connected to groun= d and=20 - pin goes to RTCC chip. when I checked cap was charged and every things working fine har= dware=20 wise. this mean super cap is charged wrong polarity without knowing but as far as= =20 functionality it works fine. looking inside electrolytic cap it is only a pair of foil wrapped together.= my=20 question is this how does + pin define? or how do they figure out + and - pin? based on my testing electrolytic cap do not have polarity. any idea how + pin is defined? AA =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .