Two QRP questions, one easy, the other, tricky...
 

Ok then.... I give up.

I had checked out the maximum frequency on all these old bipolar power
trannies, and basically, I've stuck them on ebay.

I seem to have quite a few BD139 power transistors. They are not as
'meaty' looking as they are medium power, plastic cased and are not
small signal types.

Looking at the data sheet he- http://www.ortodoxism.ro/
datasheets2/6/0rwiehk82adehe25p4gkxjros2yy.pdf

It say these transistors are good up to 190MHz, so does this mean I
can use one instead of a 2n2222 (I have lots of these BD139's and if
they'll work, I'd like to try)

Would I have to change any of the component values of the Michigan
Mighty Mite ( http://cs.okanagan.bc.ca/ve7ouc/eng/kc6wdk-
mirror/transmitter.html ) component values to use a BD139? Say 1/2 or
1 watt resistors?

Stephen
G7VFY

Two QRP questions, one easy, the other, tricky...
 

On 2 Feb 2007 21:23:07 -0800, "mister35mm"
wrote:

OK OK boys... yes I know 2n2222's are wonderful and plentiful, but I
have a heap of geriatric bipolar power transistor I thought it might
be worth experimenting with:-

2n3055 (three)

2n3054 (four)

I used time ago with good success up to 100MHz & 1W
2n3053 ...


--
Regards , SPAJKY ®
mail addr. @ my site @ http://www.spajky.vze.com
4y - "Tualatin OC-ed / BX-Slot1 / inaudible setup!"