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Extra info for Basic Theory and Application of Transistors

Example text

E7. Sinllifieddiagramoflnw thcratioof ooltsinl ooltsnt dnhsralidb u the cntoffteWenqofafiltq b e,rualcd. All Ebrrole Uorr tb cubt Inryenq an lM sitho*t attenuatio* previously, ButRC,asnoted isegual tothetimecmskntdtheRCombinatio. Ilence: \. : mt whereT irsthe time constant,in seconds. Thelatter ic normallyquotedas(somany)dBperoctave(or eachdoublingdfrequency)(see Fig. e8) whichshowstherelationship betweendBandvoltqbfrcttsdratio,and alsothe tnre form of thefrequencyresponse ctree. PASS FILTDRS Circuitsd this type are ealledlowlass filtersfuu* they passsg siguts belowthe @crrt-off frequencywith little or no loss or atbntutios e Jgnal streryth" with signls abovethe cutoftfrequency,thereis increasingatteotntim.

It candsobeextended resistorfor R it canbeadiusted aseriesofRCcircuits,each in theformof anoveltylightingsystembyconnecting with a differenttimeconstant eachRCcombination with a neonlampin cascade, neonsin tle completecircuit. -Fig. &4. pass*noughttrecapacitor, proportion applied of the what determines appffr UvtfreRCtimeconstantwhich the time, At the same t}rough the capacitor. Its maininfluenceis Ciiipt* 3), althoughthisdoesnot actuallyconsume of RCcircuits. on frequencyresponse SIMPLE COUPLING Couplingonestageof a radioreceiverto the next stagevia a capacitoris onitsown, isapparentlyused Althoughthecapacitance commondesignpractice.

In p'ractice,full charge,or completedischarge, canbe considered as beingachievedin a periodof time equalto five time constants. Thus,in the circuit identifiedwith Fig. G2, closingswitctr1 producesa fdl chargeon ttre capacitorin 5 timestime constantseconds. hedfor sometime afterthe circuithasbeenswitchedoff. &1, switch2 is closed, whenthecapacitor discharges throughtheassociated resistance, tahng a finiteamountof time to completeits discharge. 0 1 2 3 { 5 0 1 2 3 4 5 Tim Coostatrt Fact6 Tiuc CosteatFactc FA.

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Basic Theory and Application of Transistors by Department of the Army


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