>Unfortunatley, I am not really good enough in analog to implement this. >Could anyone give me some guidelines or some ideas to get started. I have >studied some comparator oscilators but not really sure what I am doing. Simple enough: 1: Get a small 9v transformer, bridge it's output and feed a schmidt= trigger. Don't forget to put a 5.1 zener and some R (maybe 220R) to ground= to "estabilize" the tension. You have your super-duper-120Hz clock. --------------8<-------Corte aqui-------8<-------------- All the best!!! Alexandre Souza xandinho@interlink.com.br Linux User #85093 --------------8<-------Corte aqui-------8<-------------- -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads