Joule Thief

[Pirate88179]

99:

Does that mean that my TIP3055's are Darlington pairs?  I used one in my Jeanna's Light circuit replication and, thanks to minimum orders, I still have like 5 of them left.

Bill

[crowclaw]

99:

Does that mean that my TIP3055's are Darlington pairs?  I used one in my Jeanna's Light circuit replication and, thanks to minimum orders, I still have like 5 of them left.

Bill

Hi Bill... no the 3055 is an standard NPN power device, the TIP 1xx devices are darlingtons (TIP131) being very common. Regards Merv

[NickZ]

  I bought a package of 15 2n3906 transistors from the Shack part number 276-1604, for super cheap.  They were all different types and none were compatible with my Jtc.  You get what you pay for. 
Their TIP31 is also something else.  So, of course the results using them will vary, as well as between the same transistors. I wish that they would stock some toroids for us though, even if they come from Guam.

[poynt99]

99:

Does that mean that my TIP3055's are Darlington pairs?  I used one in my Jeanna's Light circuit replication and, thanks to minimum orders, I still have like 5 of them left.

Bill

The TIP3055 appears to be TI's plastic version (larger TO-220 type) of the old workhorse the 2N3055, which is a TO-3 package. They are a single NPN power BJT.

.99

[WilbyInebriated]

Newark (now "element 14") screwed up on that page. If you scroll down you'll see a NTE196 substitute data sheet. It is not a Darlington transistor.
http://www.nteinc.com/specs/100to199/pdf/nte196.pdf

Here is the datasheet for the TIP31 series:
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2007/aw259_bkr24/TIP31.pdf

.99

PS. Darlingtons in the TIP series start at TIP100.
http://www.futurlec.com/TransPowerTIP.shtml

thanks poynt. i started to wonder too after i posted that. checked a radioshack tip31 still in box and it says what nick said. my bad.