I am interested in Mike Harrisons idea of trying to get an mpu reset circuit (chip) to oscilate, using some resistors and a cap, for my low speed external mpu clock. I need 100Hz nominal, but higher (200, 300) would be okay. 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. Thanks for any help. John -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads