Peter Walker did this around 1970 for the Quad 303 power amp (I believe 3 transistors were involved) when there was no PNP version of the famous 2N3055.Īnd there may be other such substitutions. active component - a circuit component that controls gain or directs current flow. Spehro Pefhany at 13:44 1 Nobody actually drives a common emitter amplifier like that with a voltage source because its asking for trouble (simA, simB or reality). Transistor Amplifier Circuits Unit 1 Introduction to Transistor Amplifiers 2 NEW TERMS AND WORDS Multistage - an amplifier circuit that uses more than one active component (transistor). If the PNP transistor was in a complementary power output stage but you can only find low power PNP transistors, I remember seeing an arrangement using a PNP driver transistor and an NPN power transistor to "replace" the non-existent PNP power transistor. Change the transistor type to something like a 2N4401. There may be solutions, depending on the configuration of the PNP stage.įor example, if the PNP transistor was being used as an emitter follower, and you have the headroom, you may be able to use an NPN in common emitter, with Rc=Re so that its gain is (approx) 1. If you need one PNP in a mostly NPN circuit, there is no general solution. Abstract: sk100 TRANSISTOR REPLACEMENT equivalent transistor sl100 sl100 npn transistor sonar block diagram air conditioner schematic diagram SL100. The gain value hfe of 2N4401 is 500, which determines the transistors amplification capacity. If it's the only type of transistor in the circuit, the translation is straightforward build the circuit as designed, reverse the power connections and any other polarised components (diodes, electrolytic caps). The 2N4401 is an NPN transistor, the collector and emitter will be open (reverse biased) when the base pin is held at ground and closed (forward-biased) when a signal is applied to the base pin.
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