Questions: RF noise, double displays

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1 week 6 days ago - 1 week 5 days ago #12445 by Ty_Eeberfest
Fanout should not be a problem - the microcontroller outputs can source (and sink) more than enough current for what you have in mind.

Here is more than you ever wanted to know about the controller chip:
ww1.microchip.com/downloads/en/DeviceDoc...ga328P_Datasheet.pdf
Page 258 for the pertinent electrical specs.

EDIT: Provided you live where the mains supply is 120VAC, a 1:1 isolation transformer + bridge rectifier + beefy electrolytic filter capacitor provides a nice 170VDC supply for little effort & expense. I've had such a supply running a bank of 16 B-7971 tubes for the last 14 years with zero problems. Some will cringe at the lack of regulation but the practical reality is that with a properly sized capacitor the fluctuations are too small to be seen on the tubes.

Look into it later when the dust is clearing off the crater.
Last edit: 1 week 5 days ago by Ty_Eeberfest.

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1 week 2 days ago #12456 by Alan7
Thanks, Ty. I'll have a look at the datasheet.

I am not AEW, though it is ironic that I share the initials AE with him. I also follow him, I wish I shared his considerable knowledge!

73
Alan AG5RJ

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