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本帖最后由 超級狗 于 2018-4-19 10:25 编辑 - n9 _$ u' q5 H
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洋人的解釋︰$ S4 N* g9 o6 g0 g7 N7 f
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Power Follower
) _8 H- c( S6 A+ J5 ~5 o, z+ b, s' ?A follower is an amplifier that provides current gain, but has a voltage gain of very nearly one. Power varies. This one is an integrated transistor operated as an emitter follower (that also includes short circuit current limit and over temperature cut off) with the LM317 acting as a constant current load (1.2 volts at its output loaded with a resistor so that it passes 1.2V / R through the resistor, and only a tiny bit more than that at its input. So the pull down current is limited to this fixed current, and the pull up current is limited by the higher current limit of the integrated transistor. Just a beefy but protected emitter follower.. ~: @" b7 S8 Q5 `- ^
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发表于 2018-4-18 15:06
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来自 19#
发表于 2018-4-21 22:29
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