2n3055 transistor question

[Void]

But Mark... the 2n3055 is a "magic" transistor. If you get a genuine one (as opposed to the fake Chinese ones with tiny dies inside probably from a 2n2222) they can do wonderful things that seem to be way beyond their published specs. Perhaps the OP wants to see these miraculous effects, and perhaps his aesthetic sense requires that they be on the common heatsink.

That was completely uncalled for TK. The guy just asked a simple question.
Ignorant condescending and insulting comments such as you made here are of no help whatsoever.

[MarkE]

thank for your reply!


More explanation: actually I test with 5v + led and resistor, the coil stuffs is not done yet, but I have the problem with the LED so I guess the coil version would not work


I don't need a lot of amp since it is used for MEG input coil, I want higher voltage and low amp and all my circuit is powered by a raspberry pi2 GPIO 5v.


But about this transistor, I dont want to buy mofset and wait 2-3 weeks to continue to work on my circuit.


Can I use my transistor, if yes, they need to be insulated from the heat sink and each collector are managed like this new circuit diagram? I dont quite understand your pre-driver  stage

If you don't need to support fast switching or significant current then you don't need a heat sink.

Parts from Digikey or Mouser can be had the next day.  If you want cheap shipping and you are in the USA, USPS priority mail shipping is usually about $7. and will typically arrive in 2 business days.

The diode needs to go across the inductor:  cathode to the +side of the coil when driven, and anode to the - side.  UF2001 diodes are cheap as are a bunch of other available diodes.  Even a modest sized coil can kill a beefy transistor if the inductive kickback is not clamped.

[TheOne]

It's too bad he's not my neighbor, I just checked my stash and I have more TO-3 mica insulators and mounting kits than I'll ever use in my lifetime.

http://www.ebay.com/itm/4-sets-TO-3-Transistor-Mounting-Hardware-Kits-Mica-Insulator-Screws-Bushings-/251202298797

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

[MarkE]

That was completely uncalled for TK. The guy just asked a simple question.
Ignorant condescending and insulting comments such as you made here are of no help whatsoever.

2N3055's were once a big work horse.  These days there are for most all applications better choices.  I think that the SparkFun board is a good choice.  He would get multiple channels so if he blows up one, he can just use another.They use decent MOSFETs and it fits an Arduino (not Rasberry Pi).  I am sure there is something similar for RPs around.

[TinselKoala]

That was completely uncalled for TK. The guy just asked a simple question.
Ignorant condescending and insulting comments such as you made here are of no help whatsoever.

On the contrary, I am perfectly serious and I am, as you see, encouraging the OP to use that transistor. Can you deny that many people use the 2n3055 in various projects, and that it will work when other similarly-rated transistors won't?

Here's my own current favorite "magic" 2n3055 project:
http://www.youtube.com/watch?v=OgndINJHnd0