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The transistor is a semiconductor device that can amplify signals and switch power. Most used types are bipolar (BJT, for Bipolar Junction Transistor), UJT (Unijunction transistor) and MOSFET (FET, for Field Effect Transistor)

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If I have a BJT with a max Ic rating of 200mA and I drive in a base current which when multiplied with hfe, results in a theoretical Ic value of more than 200mA, will the collector actually draw in mo …
asked Feb 15 '14 by ubuntu_noob
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The Collector current Ic is related to your base current Ib using the relation Ic=(hfe)(Ib) where hfe is typical for your transistor. Hence, Collector voltage will be given by the eaquation Vc=V-IcR=V …
answered Feb 17 '14 by ubuntu_noob
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I checked the link to this question, but as I was attending a few lectures I was constantly told (also told by some very experienced designers/enthusiasts) that adding an emitter resistor to an NPN tr …
asked Mar 3 '14 by ubuntu_noob
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You can take the Rb and connect it directly between the base and VC and denote it as Rb+Rc. Then the circuit simplifies a great deal and then you can use the two variable method specified by LvW.
answered Apr 29 '15 by ubuntu_noob
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you need a latch. a simple transistor design would be simulate this circuit – Schematic created using CircuitLab Under normal circumstances switch SW1 would be closed, hence transistor Q4 wud …
answered Feb 13 '14 by ubuntu_noob
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5answers
What would happen to a BJT if both junctions of the transistor are forward biased? Is there any literature on this? By literature I mean characteristics/equations. Any links would help. I have also dr …
asked Jun 26 '14 by ubuntu_noob
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simulate this circuit – Schematic created using CircuitLab I was wondering whether I could use this circuit as a constant current source provided my load circuit impedance was less than Rb/hfe? …
asked Feb 19 '14 by ubuntu_noob
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simulate this circuit – Schematic created using CircuitLab I have drawn the approximate circuits for you. Please do the math.
answered Feb 13 '14 by ubuntu_noob
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1answer
I'm working on a permeability measurement project and my setup includes a primary as well as a secondary side of a coil. I need to measure the flux through the coil, hence on my secondary side I have …
asked Mar 25 '15 by ubuntu_noob
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The LED does not glow because since the emitter is grounded and the collector to Vcc resistance is high (1kohm), the transistor will happily drop off the entire 6V (or almost) across the 1k resistor. …
answered Feb 15 '14 by ubuntu_noob
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Suppose I have a circuit which gets damaged for spikes and high voltages, so that I need to eliminate spikes and high voltages beyond a maximum value, so I have decided for the following two configura …
asked Nov 22 '14 by ubuntu_noob