Hi
Having said the LM9022 VFD filament/HV driver chip had gone unobtainium,
I've found it back in stock with RS Components in the UK at about the
same price that it was when I last bought them from Farnell. Anyone
experimenting with VFDs might find this an interesting chip. I use it
in my Approx Clock: 5V goes in and an AC for the filament and drive to a
Dickson voltage multipler comes out.
Cheers Grahame
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