# MPSA42 confusion

i want to drive my nixie clock with mpsa42, but i am confused about wiring diagram. I found one with Base resistor and one without it. From some sources i found that mpsa42, is digital BJT, but from its datasheet it´s not very clear for me Link to Datasheet of mpsa42: https://cz.mouser.com/datasheet/2/258/MPSA42_7eMPSA43(TO-92)-1626582.pdf

Edit: i wanted to drive it like this:

The MPSA-42 is NOT a "digital" transistor in the sense that that is normally meant.
It does not include a base resistor on the package - this must be provided externally if required.

A base drive resistor will be required in all common emitter circuits.

Please provide a copy of your circuit and / or a link to the circuit you intend to use. Usually the MPSA42 emitter will be grounded, the base will be driven via a resistor and collector will connect to a positive high voltage load.

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