> 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.
Oh, cool! Nice catch. I'd been looking at trying to use an ICL7660 (AKA MAX1044, a switched capacitor driver) to do that job - usage I found in a polarizing supply for an electrostatic microphone. Or using a TSC428 (also available as MAX626, it's actually intended as a MOSFET gate driver, but it's basically a small dual power driver on a chip) connected to a processer pin generating PWM - a useful idea I lifted from Konstantin. I also saw some designs for using CMOS gates to drive voltage multipliers: http://www.gyraf.dk/schematics/Voltage_multipliers_with_CMOS_gates.pdf - John -- 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 https://groups.google.com/groups/opt_out.
