hi ... sorry if this is obvious, but changing c7, c8 and c9 in what way to increase speed ? higher or lower than 1u ? ... I'm building this but I only have at hand 7660s, not 1044... so I don't know yet if I'll have the problem Jiuk mentionsYou didn't say how much faster you wanted to go. Changes in speed at the top end of the range can be achieved by reducing R14 & R15. If you go too far, the oscillator will stop when you max out the SPEED control. You can change the entire speed range by changing C7-C9.