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That's why we use the two biasing resistors. Their purpose is to add a DC bias to the input signal so it becomes entirely positive.
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thank you for the help fubar.gr!
ok, so the arrows are either in the conventional current direction, or the actual direction of electron flow, or a mix of the two, whichever the case may be.
i'm trying to get it positively confirmed that, (when a bjt is biased right for the amplification/operational region, if that's a necessary condition),
currents would only go in one direction, they would never have currents reverse their directions,
and that is the only way bjt's behave, no other way.
does "entirely positive" mean currents in a bjt go only in one direction, and never reverse?
and the so called "ac", either input or output, is merely a current changing between weaker and stronger, but never reverse directions?