re help with ultra long timing in article c wi g a athena cs uga edu mcovingt aisun ai uga edu michael covington writes don t use big capacitors they are unreliable for timing due to leakage instead use a quartz crystal and divide its frequency by times or something like that mhz divided by cycle per weeks approximately i wouldn t expect any components other than batteries or electrolytic capacitors to fail at c or f for that matter either the battery is going to be your big problem also of course your circuit shouldn t depend on exact values of resistors which a crystal controlled timer won t wouldn t a crystal be affected by cold my gut feeling is that as a mechanically resonating device extreme cold is likely to affect the compliance terminology of the quartz and hence its resonant frequency michael a covington internet mcovingt ai uga edu artificial intelligence programs phone the university of georgia fax athens georgia u s a amateur radio n tmi johnh electronics department school of mpce macquarie university sydney australia email johnh mpce mq edu au ph fax
