Joule Thief

[resonanceman]

Jeanna:

I just found this while searching for TIP3055's:  (From RS's Website)

[5 of 6 customers found this review helpful] Its really a MJE3055By TIP-less from Iowa on 3/29/2008Cons:IncompatibleComments about RadioShack TIP3055 NPN Transistor:
The transistor works fine, but its NOT a TIP3055... its a MJE3055, which is rated at 75W not 90W.Was this review helpful to you? Yes / No- You may also flag this review.


I ended up ordering 10 from Digikey as they were cheaper and, hopefully, TIP3055's.

Bill

Bill

I was thinking  of posting  something  about  the same subject  when I came across  your post .

I got my original TIP3055 at radioshack
I just  got  10 from  Egoldmine   When I first saw them I thought that they had shipped me the wrong transistor ......the ones they shipped are  at least twice the size of the radioshack version .
It does say  TIP3055  right on them  ......the  manufacturer is ST


I do still like the  radio shack version .......it has  lasted  several times longer than any of my 2N3055s did

[xee2]

@ resonanceman

Bill

I was thinking  of posting  something  about  the same subject  when I came across  your post .

I got my original TIP3055 at radioshack
I just  got  10 from  Egoldmine   When I first saw them I thought that they had shipped me the wrong transistor ......the ones they shipped are  at least twice the size of the radioshack version .
It does say  TIP3055  right on them  ......the  manufacturer is ST


I do still like the  radio shack version .......it has  lasted  several times longer than any of my 2N3055s did

My TIP3055 are from ST and the leads are to big to fit in my breadboard sockets. Since the Radio shack is smaller, does it have smaller diameter leads also? That would be an advantage in my opinion.

[resonanceman]

@ resonanceman

My TIP3055 are from ST and the leads are to big to fit in my breadboard sockets. Since the Radio shack is smaller, does it have smaller diameter leads also? That would be an advantage in my opinion.

Xee

Yes  I am sure it will fit .

I  did not  have  a spare one to  try ...........but it seems to be a standard size .......I  tried a MOSFET  the same size  and it slipped right in


gary

[jadaro2600]

Has anyone got any good how-to information about transistor internals, for instance, testing the transistor with a basic multimeter to figure out it's operating potentials, etc.

In one of my tests, I ran the current contra-intuitively..    using two sources, i ran one NPN transistor with connection B+ to E- to open the channel, and another E+ to C-.

This supposedly works toward the realm of negistors, but I don't have the equipment to test ideas.

[jadaro2600]

Anyone thought about using a Wiegand-wired toroid? ..or just Wiegand-wire in general?