2n3055 transistor question

[TinselKoala]

I was watching this yestruday (http://www.ebay.ca/itm/TO-3-Mica-Insulator-50-x-Mica-sheet-100x-Nylon-bushing-2N3055-3773-Free-Shipping-/161541288294?pt=LH_DefaultDomain_0&hash=item259c9c7166)


I guess I need to buy some to continue my experiment


so If I use them I should not have any issue with my transistors.


I want to use this transistors because I have a lot of them and need to be used on a project

Actually you still will face the base drive issue if you are trying to drive directly from your microcontroller and are looking for hard switching. You can put a simple inverting driver stage using 2n2222 or the like, between the mcu and the power transistor, and then invert the signal in the code so you still get the right cycles at the 3055 output.

Could you please edit your photo so that it isn't so big? If you keep photos to less than 1024 pixels wide, it won't screw up the page width and make comments hard to read.

p.s. you could also just cut the heasink in half down the middle with a hacksaw....

[TheOne]

on my raspberry pi2 I made a c++ program that control the PWM1&2, they can be switched from 1hz to +1Mhz and the duty cycle can be changed from 1% to 50%, it is why I want to use a heat sink, I don't know what is the max frequency a magnetite core can handle, I will need to experiment.

[TheOne]

Actually you still will face the base drive issue if you are trying to drive directly from your microcontroller and are looking for hard switching. You can put a simple inverting driver stage using 2n2222 or the like, between the mcu and the power transistor, and then invert the signal in the code so you still get the right cycles at the 3055 output.

Could you please edit your photo so that it isn't so big? If you keep photos to less than 1024 pixels wide, it won't screw up the page width and make comments hard to read.

p.s. you could also just cut the heasink in half down the middle with a hacksaw....

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

[MarkE]

What frequency do you want to drive at, and what turn on and turn off time is acceptable to you?

[TheOne]

What frequency do you want to drive at, and what turn on and turn off time is acceptable to you?

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