what are voltage multipliers

they increase peak rectified voltage without needing to increase the transformers voltage rating

what information is found on the diode data sheet and describe the 3 items you can find there

maximum (power) ratings, thermal (heat) characteristics, electrical characteristics and graphs

how do you test a diode

multimeter, low resistance in forward bias, open loop in reverse

how do you tell if a diode is bad while testing

if it shows open in both bias's

in a bridge rectifier, what would you see in a working circuit versus one where a diode fails

working circuit will be full wave (120 Hz) not working will be half wave (60 Hz)

what is a zener diode

a diode designed to work in the reverse breakdown region

what is a varactor diode and what does it do

a diode always in reverse bias designed to maximize the capacitance in the depletion region

A diode that when in forward bias, emits light

what is a photo diode? what happens with and without light

a diode that works in reverse bias, that produces reverse current when light is absorbed, lack of light leads to dark current

what does LASER stand for

light amplification (by) stimulated emission (of) radiation

how does the text describe laser light

monochromatic (one color) and coherent light (single wave)

what is a shottky diode and what is it used for

high current diode used for high frequency and fast switching applications

what is a tunnel diode and what makes it unique

diode that produces negative resistance

what is pin diode and what does it do

has heavily doped P and N regions, when reverse biased acts as nearly constant capacitor when in forward bias acts as current controlled variable resistor

what does a BJT do, what are the leads

an npn or pnp junction with 3 leads being the base collector and emitter

what is Bdc (beta DC)

the ratio of the DC collector current to the DC base current

what are cutoff and saturation, describe in terms of voltage and current

transistor is in cutoff when current is zero and VCE equals VCC, transistor is in saturation when collector current is maximized

describe the use of a BJT as a switch

a short between collector and emitter in saturation and an open between base and emitter in cutoff

what is a phototransistor and how many leads could it have

similar to a BJT but base current is controlled by light, not a source voltage

analog

Authored by jon campbell

Physics

University

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