Sorry, I meant to say a PNP transistor with emitter tied to 180V rail.
On 3/29/2016 3:23 PM, David Forbes wrote:
Shep, There are two polarities of transistors, NPN and PNP. NPN requires the base to always be 0.6V more positive than the emitter, and PNP requires the base to be 0.6V more negative than the emitter. The anode must be controlled from the 180V point, not from the 0V point. The most straight-forward way to do this is with an NPN transistor whose emitter is connected to 180V. The base is controlled by a high voltage NPN transistor through a resistive divider, to allow the on/off command to be sent across the 180V 'space'. An example of a multiplexed anode drive circuit that works is shown in my old Nixie clocks... page 17 has the schematic diagram. http://www.cathodecorner.com/nc620akitman.pdf
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