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1、超低失真正弦波发生器电路Generatesverylow-distortionsinewavesupto1VRMSNothermistorsrequired-NosettlingtimeParts:P1_____________10KLog.Potentiometer(Dual-ganged)P2______________2K2LinearPotentiometerR1,R2,R4,R5_____3K31/4WResistorsR3,R6_________820R1/4WResistorsR7_____________10K1/2WTrimmerC
2、ermetR8_____________22K1/4WResistorR9_____________Photoresistor(anytype)R10_____________8K21/4WResistorR11,R12,R14,R15_3K31/4WResistorsR13_____________2K71/4WResistorR16--R20________3K31/4WResistorsR21____________56K1/4WResistorR22____________68K1/4WResistorR23_____________1K1/
3、4WResistorC1,C6_________220pF63VPolystyreneCapacitorsC2,C7___________8n263VPolyesterCapacitorsC3,C8__________82nF63VPolyesterCapacitorsC4,C9_________150nF63VPolyesterCapacitorsC5,C10________680nF63VPolyesterCapacitorsD1--D4______1N414875V150mADiodesD5_____________LED5mm.RedIC1,
4、IC2_____NE5532LownoiseDualOp-ampsIC3__________TL084QuadBIFETOp-AmpSW1__________2poles3waysrotaryswitchComments:Producinglow-distortionsinewaves,thisoscillatoroperatesovertherange16to22000Hz.ThecircuitisbasedontwoarticlesthathaveappearedearlierinWirelessWorld-RogerRosens'"ha
5、se-ShiftingOscillator",February1982pp.38-41,andJ.L.LinsleyHood's"Wien-BridgeOscillatorwithlowharmonicdistortion"fromMay1981pp.51-53.ThisdesignfeaturesthesimplicityoftheRosens'circuitbutavoidstheuseofathermistor.Instead,oscillatorstabilityiscontrolledbymeansofacommonphot
6、o-resistordrivenbyaLED,assuggestedintheLinsleyHoodarticle.Thereisnosettlingtimewhentheoscillator'sfrequencyischangedandnobouncingoftheoutput1waveform.Useofanexpensiveandsometimesdifficulttoobtainthermistorisavoided.Technicaldata:Outputvoltage:Sinewave,1VRMSmax.Totalharmonic
7、distortion@1VRMSoutput:FrequencyReading100Hz=0.0035%300Hz=0.0028%1kHz=0.002%3kHz=0.002%10kHz=0.001%Notes:?Anycommonphoto-resistorand5mm.redLEDcanbeused,providedtheyareinclosecontactandenclosedinalight-proofsmallbox.IusedthemetalscreenofasmallIFtransformerforAMtransistorradiosse
8、aledwithblackinsulatingtape.?The10Ktrimmermustbesettoo
