I can't see why, it's connected directly to the ground line on the breadboard... It may be an effect of the capacitors or the flyback, but I''m the one asking for the help, so I don't know.Looks like your 'scope probe doesn't have a good ground? The signal appears to be going negative, and it shouldn't do that.
not that I can tell. if there is it's less than one tenth of an ohm. I let it sit for awhile and collected another sample, this time with the probe ground right on pin one of the 555, I also collected data on channel 2 across the timing cap, I don't know what's happening during the portion in the screenshot, it blows my mind, it might be a glitch?? but after it continues as normal. everything seemed alright this time (with the exception of smoke from under the flyback, is superglue conductive?)I count ~22.5 divisions out of 25; so that's 0.9*200uS = 0.00018 = 5.555kHz.
The frequency's being counted from the "T" marker to some unknown point - I guess you have x5 or x10 enabled?
It could be that your 555 ground terminal or MOSFET source terminal ground path isn't very good?
I went ahead and attached the text file of the data, I don't know if you'll be able to easily reconstruct a graph with software similar to mine or not, but if you can it should help as you'll be able to see the whole sample instead of a screenshot
in any case, it might help those in the future.
As for the frequency recording, I'm not sure where it measures to, I don't see it as a setting anywhere, I'll have to find the users manual and look it up.
[EDIT]
It would appear that the text file is too large... Oh well *shrug
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