2n3055 transistor question

[MarkE]

Any frequency really, from 1hz to 1mhz and same from duty cycle, right now I am using 10% duty cycle and 4 hz for led (test)
but I can change the frequency and duty cycle in realtime... I can post the program if some want to experiment with it.


Basically I think for a MEG, a low duty cycle is best with a higher frequency, but I dont know what a magnetite core can handle


Once all my circuit will be resolved, I will need to print a 3d core in PLA and i will fill it with magnetite without any glue

1MHz is out of the question with a 2N3055.  20kHz would be pushing it.  1kHz to 5kHz s/b OK.

[TinselKoala]

yeah that another solution, not sure if i will do that, sorry my phone take enormous photo and i did not scale down, next time i will use gimp to scale it down


My PI2 handle 2 PWM


PWM1 is using the defined frequency
PWM2 use the PWM1 * 2, then I use 2 NOR gate to make it ON at the right time

Yes, I see that, that's fine, but I am worried about your logic gates having enough current to drive the 3055 directly. Although...
http://www.youtube.com/watch?v=COdaoigsQ0Y

(See? I DO have breadboards and clipleads.)

[TinselKoala]

1MHz is out of the question with a 2N3055.  20kHz would be pushing it.  1kHz to 5kHz s/b OK.

See? That's exactly what I mean. The TK MiniSlayer operates at much higher frequency than one would expect a 3055 to be capable of. I just got it off its high shelf, dusted it off and measured its operating frequency. It's running at 681 kHz. You don't get that kind of plasma globe display at low frequencies.

Here's the Base signal, with 12 V input to the circuit:

[TheOne]

See? That's exactly what I mean. The TK MiniSlayer operates at much higher frequency than one would expect a 3055 to be capable of. I just got it off its high shelf, dusted it off and measured its operating frequency. It's running at 681 kHz. You don't get that kind of plasma globe display at low frequencies.

I am uploading a new video, it start to fail at around 800khz
https://www.youtube.com/watch?v=HYOrAGxucrI

[MarkE]

See? That's exactly what I mean. The TK MiniSlayer operates at much higher frequency than one would expect a 3055 to be capable of. I just got it off its high shelf, dusted it off and measured its operating frequency. It's running at 681 kHz. You don't get that kind of plasma globe display at low frequencies.

The losses through a 2N3055 at that kind of frequency are horrendous.  Change transistors to something more appropriate and it will be a SUPER slayer.