On 5/29/11 3:18 AM, MrNixie (UK) wrote:
I have used HV9308's which are designed for 5V logic inputs, but only switch 80-90V tops, so you have to be careful. That's OK if you've got (say) 180V supply, then there will never be less than 120V dropped through the nixie, leaving the HV9308 just to switch the last 60V or so to ground. It works.
I use the Toshiba TD62083 octal Darlington driver in my 2-digit Nixie watch. It handles only 50V, but this works just fine. Nixies only need 50V difference between cathodes to make only one light up.
I did a bit of a hack for blanking, injecting a bit of extra current into the the HV supply feedback via a control bit, to lower the voltage to ~110V while blanked.
I also multiplex the 2 digit display. The blank tube doesn't seem to mind that it's getting 130V on all cathodes for a few milliseconds.
The clock portion of the circuit uses only three small TSSOP chips and zero transistors, so it's the lowest-parts-count Nixie timekeeping device I know of. The PC board is 15mm x 38mm. The power supply is on a separate 40mm diameter board.
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