Those values were left over from the 5v circuit. I was more concerned with
the level shifting from the PIC at 0 to +5v.
Peter
On Mon, Feb 15, 2021 at 6:48 PM Jon wrote:
> I'd had a similar thought about increasing the bias resistors - it's not
> necessary to run so much current (5mA) through
I'd had a similar thought about increasing the bias resistors - it's not
necessary to run so much current (5mA) through that part of the circuit.
OK, so your proposed conditions are that the dekatron will see are 400V
anode to main cathodes; guides swinging from +25V to -25V with respect to
I'd raise the resistance to at least some 100k for the two bias resistors
R5 & R6 in your diagram above.
I'd also use the correct bias voltage and just use an MPSA42 with its
emitter to common ground for the driver to simplify the circuit as Ronald
Dekker and Michael Moorrees with their
