"Neither ONsemi, nor Fairchild quote fT data in the MJE340 device datasheet.
Where did 15MHz to 60MHz come from? "
From National Semiconductor data for their raw die, they published a fT vs current graph. The highest speed came at a higher current than what the Vas would be comfortable with on high voltage rails. One could parallel them as I have seen in some designs.
"it possible to use tips or not "
The TIP 'C's are 100V parts, so the max voltage you can run must be no more than ±50V. TIP 'F's are 160V (if you can find them). However, they are only 3Mhz and you would probably need to change the frequency compensation of the amplifier.
Sir is a title of respect, and no one deserves it from the circumstance of birth (titles of nobility). People I work with and have earned my respect always receive a 'thank you sir' from me at work when they have done something for me.
Where did 15MHz to 60MHz come from? "
From National Semiconductor data for their raw die, they published a fT vs current graph. The highest speed came at a higher current than what the Vas would be comfortable with on high voltage rails. One could parallel them as I have seen in some designs.
"it possible to use tips or not "
The TIP 'C's are 100V parts, so the max voltage you can run must be no more than ±50V. TIP 'F's are 160V (if you can find them). However, they are only 3Mhz and you would probably need to change the frequency compensation of the amplifier.
Sir is a title of respect, and no one deserves it from the circumstance of birth (titles of nobility). People I work with and have earned my respect always receive a 'thank you sir' from me at work when they have done something for me.
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Here it is:
Thanks!
It contains more detailed info for MJE340 but there is no fT vs current graph.
So if someone have is please post.
I will sir as of now I'm into a second board for etching he he he i got to use the old good way for making the PCB wish me good luck sir
regards
@apex sir is it possible to use a PNP trannie to this P.A. and how pls enlighten me sir and i ask something else else is the feedback resistor of this AMP is 22k or 2.2k where can i find it the quality is good but to much med or i mean to much vocals what value of resistor di i change to become lesser meds/vocals
regards...
regards...
