Blocking Oscillator fun and surprises.

[Legalizeshemp420]

Here is the signal unzoomed.

[TinselKoala]

Your scope trace shows 7 peaks in 8 horizontal divisions. So that is 7 / (8 x 0.5 microseconds) = 7 / 4 microseconds = 7/0.000004 sec = 1.75 MHz.

It looks like your counter is the one misplacing decimals.

ETA: So you are using a 10x zoom in the first scopetrace? Why did you not say so when I asked you what the timebase was?

It's hard to discuss stuff, without a schematic or the correct information about your scope settings.

[Legalizeshemp420]

Your scope trace shows 7 peaks in 8 horizontal divisions. So that is 7 / (8 x 0.5 microseconds) = 7 / 4 microseconds = 7/0.000004 sec = 1.75 MHz.

It looks like your counter is the one misplacing decimals.

ETA: So you are using a 10x zoom in the first scopetrace? Why did you not say so when I asked you what the timebase was?

It's hard to discuss stuff, without a schematic or the correct information about your scope settings.

I didn't know what my scope was at until I just used it for the picture AND I counted almost 9 within a division.

5e-7/9=18000000 so that is pretty much what I am seeing on the scope.

[Legalizeshemp420]

OK. That is 0.0000005 second or 500 nanoseconds per division. Right?

So what is the period of a 17 MHz signal?

1/17,000,000 = 0.000000058 = 58 nanoseconds. So a 17 MHz signal should have 500/58 = almost nine peaks per horizontal division.

Right? Or did I drop a decimal point again?

You dropped a decimal point as 1/0.0000005 = 2mhz not 20mhz so just add one more zero 0.00000005 to equal 20mhz.

[Legalizeshemp420]

I could run up a schematic but I have no way of knowing what the inductance is of my coil.  I use a toroid with 24ga (seen in the picture and video) wire wrapped twice.  The toroid came from a 100watt equivalent CFL.

In my circuit you see on the video it is using a S8055 transistor but I just tried a BC337-25 and it was even better except at lower voltages where the S8055 beat it.  Same beautiful waveform but about 200khz higher frequency using the BC337-25 at 1.2V

When I simulated this circuit it did not behave as irl.