The PCB is very hard to follow with those dreadful colors, Eagle? The FB trace is definitely no good. It's imperative to keep it just as a minimum pad right at the chip with just the two resistors connected. Even just probing it with a scope might add enough stray capacitance to pick up noise that makes it unstable. Also keep in mind that the drain of the FET is an intense source of noise. My 2:nd attempt with a single side board worked without decoupling after using a SMD to ground and a ground trace all the way around the pad at this critical pin.
-- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
