I recommend the Texas Instruments SN75468 Darlington driver IC instead of all
those transistors. It has seven 100V transistors. The clamp diode pin 9 wants to
be connected to 1/2 the Nixie supply voltage, about 90V. A resistor-based
voltage divider will work.
I use a lower voltage part in my Nixie watch, the TD62083. It only handles 50V,
though, so you cannot blank a digit cleanly. The SN75468 allows clean blanking,
with the clamp diodes connected as I described above.
On 9/29/2016 12:42 PM, newxito wrote:
For the next PCB based projects I’ m not sure if I should stay with the 74HC595
and the MPSA42 transistors or if I should start using modern components like the
HV5622. Is there a recommended way to implement direct drive?
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