> I am working on a multiplexed display and am finding that for the lines that 
> have both of their transistors turned off, there are massive swings of 
> voltage that are induced on the lines. The levels are so high I get other 
> digits flickering in the tube and I also have neon bulbs that are attached 
> get lit up.

One approach is to slow down your switching.  I like to do this by using 
optoisolators to switch the anodes.  They easily let a logic level control a 
high voltage signal, and they're generally a bit slow to operate, which is an 
advantage here.

- John

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