Yes that does in fact confuse me even more. However I looked at the
component list from the source of the image you sent ("M. Moores' Nixie
Thermometer Kit") and he does use 1/4W resistors and not >1W like the
Russian datasheet indicates so that's good.
Here's the circuit I currently have which is a mix of what I could find
online. So far all of the components fit on a 25x20mm PCB (I intend on
making small individual sockets). I'm using an I2C DAC (MCP4706) so that I
can drive more than 6 bargraphs with an Arduino Uno (which can only do 6
PWM at once) with fewer pins. This one has 8 addresses so 8 tubes.
I'm not sure what I need for Q2 however. Should I use a second MJD340
(which is the SMD version of the MJE340 I've seen on many existing design)
or any transistor will do? Or do I need it at all? Many designs don't
include it for some reason. My understanding is that it's there for because
of this from the Russian datasheet:
> "To avoid braking the light column when switching abruptly, we recommend:
When switching on, the main cathode should not be on, and there should only
be current on the auxiliary cathode."
On Tuesday, May 7, 2024 at 9:17:50 PM UTC-4 Mac Doktor wrote:
>
> On May 7, 2024, at 9:05 PM, gregebert <greg...@hotmail.com> wrote:
>
> 4.5mA wont be a problem for a 1.5K (or smaller) SMT resistor, because the
> power is 30mW (or less). I guess the 3-terminal IN-13 has a much better
> behavior than the 2-terminal IN-9.
>
>
> It's the "improved version". Here are some articles that delve deep into
> the IN-13:
>
> https://www.saltechips.com/lab/
>
> Very interesting.
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> https://www.astarcloseup.com
>
> "Would you like to see the relevant data?"—343 Guilty Spark, *Halo 2*
>
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