> one 741 > one BC107 and > one 1k resistor... or scrap it all and use a 555 ;) Wouter van Ooijen -- Van Ooijen Technische Informatica: http://www.voti.nl Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.