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A 2N3705 transistor has a value of hFE of 116.4. When the current through the collector is measured as 50mA, what would be the value of IB in μA? |
May 02, 2018 |
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This is an unreal question. First the value of hFE varies with voltage, current and temperature. It is meaningless to describe it to such accuracy. Secondly you always design so that hFE does not matter, for example by applying feedback, in which case you only need it guaranteed to be more than a certain figure. Tell your teacher to get out in the real world occasionally. And if you can't figure out the answer to this trivial question, should you be on this course at all? |
May 02, 2018 |
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about 400uA but it really depends simply： IC=hFE*IB the formula works when the transistor is during Zoom out zone... |
by lukeluck May 03, 2018 |
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