The BFR106 shows Vceo as just 16v. That is kind of low for our work. At 1/2 watt into a 50 ohm load, The voltage van swing +/- 7 volts, which is about 14 volts. We are almost at the breakdown point. How has your experience been??
- f
toggle quoted messageFor Q90 BFR106 is fine for the predriver and driver you need something else.
As is Q90 sits there with 12V supply to the box and about 2V on the emitter and about .5V drop to r84.
so its barely seeing 10V.? Also 2n5179 or the mmbt5179 would work.
As to using it for power beyond a few milliwatts no,? Wrong part.? BUT the system is wired to get
18+db of gain from q90 and the 3904 can't do that past maybe 10mhz.
For Q10-12 and Q20-22 its also fine as its not running much power and the amplitudes are
under a volt.? If there were concern r10 and 28 can be 270 ohms and 9.1v zener to ground
to regulate the voltage.
All stage here are low level milliwatt maximum.
Allison
