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5、en used in amplifiers having an inverted output. The output of Q1 at its emitter shall have a loss up to 650mv depending on the transistor gain. The circuit shall have an output proportional of input, less switching loss. The bias voltage is dependant on R3 value, which also defines Q1 emitter outpu
6、t DC voltage. Other condition may exist depending on the value of R4 and R5. Fig2 Fig3 Fig4 Unlike Fig 1, 2, and 3 fig 4 shows non- inverting output whose collector voltage can be switching opposite of the vb for Q1. The higher the vb at Q1 the lower the collector voltage will be. That is because mo
7、re biasing will cause Q1 to conduct more as the current flow through R4 is nominal compared the current to be drawn through R5. RadioFans.CN 收音机爱 好者资料库 PNP transistor used with Positive Power supply to Emitter and +ve biased. Rectangular box shows DVM In this kind of configuration the transistor is
8、biased by Positive voltage. Do to the characteristic of the PNP transistor reaction to a Positive supply at the emitter, the collector voltage will retain above the 600mv minimum switching voltage. Even when the vb (base bias voltage) reaches near 0vdc, the lowest the collector voltage will get is 6
9、50mv. Such configuration of a transistor is good where a circuit is expected to operate at high frequency and need not idle below the switching voltage. It also provides none inverting output. The transistor output is dependant of vb value, which can be trimmed by the resistor R3. Such circuit is of
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