please do not draw schematics like this i am begging you

once i get it running and get to the first post-prototype revision, i'm probably going to try to make this thing available to the general public

electronics 

workin on a little side project

software 

alternatively, here's how to use your system avr-gcc with Microchip's provided device support packages

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software 

here's the code in Microchip's xc8 avr compiler, which is actually just modified avr-gcc and thus covered by GPL and open source (they squirrel this away pretty well) that yells at you to pay them for features an open source development community built them for free

-DSKIP_LICENSE_MANAGER=1 and rebuild it from source

electronics 

holy poop i think the crt chassis design is actually done

next step: generating a bom for all this and seeing how much i just fucked myself lol

electronics 

i'm really looking forward to this coming together

electronics 

nice to see the -2kV is right where it should be. -1920V on the cathode (the remaining 80V is grid cutoff bias). I thought I had an accuracy problem but my probe wasn't adjusted right

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electronics 

fun little waveform, this is what my probe sees at the crt cathode pin if it's not quite touching it. i think the -2kv arcs to it, charging it up, then the probe capacitance is slowly discharged by the probe resistance until it reaches the breakdown voltage of the air gap again

(scale x100, 500V/div)

makes a fun quiet hissing noise

electronics 

man, I was pretty concerned that the whole "i need 200+Vpp of AC for a thing, I know I'll just use a plain ol Colpitts oscillator running at a lot of volts" would result in some smoke escape but it works perfectly :)

electronics 

when your traces look like mod wires, mod wires look good

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