Mje3055

[bwells]

I'm looking for a MJE3055, Silicon Epitaxial Planar Transistor, WOW! I'm not sure what it does but I need one and on-line they go from .99 to 11.96! The only electronics store I have is Radio Shack and have no way to cross reference this number to a Radio Shack one. Any thoughts would be appreciated.

 

[jdetray]

This Radio Shack part will probably do the job:
http://www.radioshack.com/product/index.jsp?productId=2062611

I think the wrong specs are shown on the Radio Shack site. In most cases, transistor substitutions can be made as long as the numerical portion of the part number is the same, in this case 3055.

What circuit are you building?

- Jeff

 

[bwells]

Thanks Jeff, that should do. It is for a capacitor discharge circuit to make my twin coil switch machines really snap! Brian

 

[waltr]

Here are links to some electronic suppliers I use that have the MJE3055:

http://search.digikey.com/scripts/DkSearch/dksus.dll?x=0&y=0&lang=en&site=us&KeyWords=MJE3055

http://www.mouser.com/Search/Refine.aspx?Keyword=MJE3055

http://www.hosfelt.com/contents/en-us/search.html?searchphrase=3055

 

[John P]

I'm quite certain that any NPN power transistor in a TO-220 package would do the job just as well.

 

[bwells]

Thanks for the info. I purchased all the supplies at Radio Shack today and built the circuit on my breadboard, hooked it up and it worked! Problem is that it didn't give me the "thwack" I was expecting, soundwise. No difference with or without it. I'll put it together anyway as I like the looks of that 2200uF cap!

 

[bwells]

drawing

This is the Circuit I built.Does it look OK? Could I change any values to get a more substantial action from the twin coil machines? I used "B" with the resistor being 220 Ohm 1/2 watt, trans mje3055, diode 1n5400 and a 2200uF cap. 22.5 vDC input.