There's a number of anomalies here. The 7805 has no reverse bias diode and no 100n output cap to prevent oscillation (read the data sheet). Is the 7805 running hot? Some 7805 variants require these, some don't.
R6 has about 180V across it - is it rated for that? There may be RF oscillation on the HV output - have you scoped the HV and LV on the failing unit? Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e091fba3-08f9-478a-91c1-bc0973471765%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
