My PV electronics IN-8-2 and my GRA&AFCH IN-14 clocks both use the HV5812 
<http://www.microchip.com/wwwproducts/en/HV5812>. This specifies 80V 
'output'. I assume this works because the off tube cathodes drift up to 
80V, which is enough to turn them off?

On Thursday, February 23, 2017 at 7:12:43 AM UTC-5, SWISSNIXIE - Jonathan 
F. wrote:
>
> The HV5530 works well with normal nixie tubes (not B7971). You also could 
> use HV5122/5222 (cheaper), they are 200V rated, but thats enough for 
> nixies. Yes these chips need 12V supply and logic, but people have reported 
> that they work with 5V logic signals. I have used a level-shifter. 
>
> I use HV5122 in my current project:
>
> See here... 
> <http://swissnixie.com/projects/SUNIX-S/SN_SUNIX_S_R1.2_WTB_SCHEMATIC.png> 
> "Level Shifting" is translating 5V to 12V logic level. 
> The ST66 chip can producte 12V 30mA from 5V, if there is no 12V available. 
>

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