Barney_Oliver_Amplifier_Manual 电路图.pdf

HP Archive This vintage Hewlett Packard document was preserved and distributed by Please visit usonthe web! Thanks to on-line curator: Kenneth Kuhn for supplying and scanning this vintage document. RadioFans.CN 收音机爱 好者资料库 ,. (jAMPUFIER= RadioFans.CN 收音机爱 好者资料库 TheBarneyOliverAudioAmplifier TABLEOF CONTENTS Section TableofContents Page I. II. III. IV. v VI. VII. DESCRIPTION A.General B.Specifications FRONTPANELCONTROLS A.INPUTSelector B.MODESwitch. C.FILTERSwitch. D.VOLUMEControl E.PhonoEqualizationSwitch(-6dB, RIAA, +6dB) F.BASSSwitch(FLAT,BOOST). INSTALLATION A.PhonoConnections. B.UseofPhonographPickupsOtherThanShureV-15TypeII C.SpeakerConnections. D.SpeakerPlacement. E.Line Voltage,FrequencyandLine Fusing. F.115/230VoltAmplifiers(EuropeanUnits) . G.InstallingAmplifierinanExistingCabinet H.AssemblyofWalnutorTeakEnclosure I.RackMountingCabinet. J.PicturesandOutlineDrawing LOUDSPEAKERPHASING CIRCUITDESCRIPTIONS A.PhonoPre-Amplifier B.FilterBoard C.PowerAmplifier D.PowerSupply. CIRCUITDIAGRAMS A.PhonoPre-Amplifier B.FilterandControls. C.PowerAmplifieroneChannel Dl.PowerSupply. D2.PrimaryCircuits. E;DeckWiring (See Sections VI, A,B,C,andD.) PARTSLISTS A.PhonoPre-Amplifier B.FilterBoard C.PowerAmplifier D.PowerSupply E.DeckParts. 1-1 1-2 2-1 2-1 2-1 2-1 2-2 2-2 3-1 3-2 3-2 3-2 3-3 3-3 3-3 3-3 3-4 3-4 4-1 5-1 5-1 5-2 5-2 6-1 6-2 6-3 6-4 6-5 7-1 7-2 7-3 7-4 7-5 RadioFans.CN 收音机爱 好者资料库 TheBarney OliverAudioAmplifier SECTIONI DESCRIPTION Description A.GENERAL TheBarneyOliverAmplifierisahigh qualityall solidstateaudioamplifier designedfor twochannelstereosoundreproductioninthe home,in studios,andin smalltomediumsized auditoriums.Itisintendedforusewithfull fre- quencyrange8to16ohmspeakersystemsand withsignal sources(phonographpickups,tape decks,AMandFMtunners)thatare themselves flatenoughtorequirelittleornoequalization.In additiontothepoweramplifiers,theunitincludes phonopreamplifiers designedtooperatefromany ofseveral magneticphonocartridges. These pre- amplifiers providethenecessaryequalizationfor theRIAArecording characteristic.Additionalplug- inpreamplifierboardshavebeendesignedfor directmoving coilmicrophoneinputorfordirect inputfromlow-level,highimpedancesources. Addingthisfeaturewillrequirethattheuserbuild thepreamplifierboards,installandwireprinted circuitconnectorsinthedeck,drillfrontorrear panel holes as required,andmodifyselectorswitch wiring. Humanddistortionareinaudible.As a resultofcarefulattentiontofilteringandtolead routingonprintedcircuitboards,theresidual humis wellbelowthermalnoise (which itself has beenminimizedbyoptimuminputstage design). Theoutputstagesoftheamplifiers areoperated class-Btoreducestandbypowerdrainandare biasedandlocallydegeneratedtoreducecrossover distortion.A largeamountofoverall negative feed- back, rangingfromover100dBloopgainatdcand lowfrequenciestoover50dBatthetopofthe audiorangefurtherreducesanyremaining har- monicandinter-modulationdistortion.Sincethe /-l-circuits aredirectcoupled, overload produces nolongtimeconstanttransients;thepeaks are simply clippedandtheoriginal waveform resumes atitspropervalue immediately afterward.Be- causeofthelargeamountoffeedback, signals onlyafractionofa dB belowactualoverload typicallyshowatotaldistortionover75dB below thefundamental. Bridged-teenetworksinthe8-circuitsofthe amplifiers,andactive filters inthemixing and controlboard,enablethelow-end responsetobe maintaineddownto20Hzandtofalloffvery rapidlybelowtheaudible range. This preventsthe amplifierandloudspeakersfrombeing driven beyondtheirlinear excursionsbylowfrequency transientsarisingfromsuchsourcesaswarped recordsorbreathblastsintomicrophones.Thehigh endresponse isreducedat18dBperoctave above 20kcbyanotherpairofactive filterstoprotect theamplifiers against overloadby,orrectification of,strongr-f signals. Thepoweramplifiers areprotectedagainst damage from accidental short-circuitsattheirout- puts.Momentaryshortswill havenoeffect, But sustainedshortsmayblowoneormoreofthepro- tective fuses.Inaddition,allpowersupplyoutputs areeithercurrentlimitedorfused sothatshorts fromtestprobeswill in general causenodamage. Finally, considerableeffortwasdevotedto reducing switching transients. A balanced build-up anddecayofpowersupplyvoltagesandcareful balancingoffunctiondropsminimizestheturn-on transients intheamplifiers. A slowturn-oninthe lowvoltage regulated suppliesfurtherreducesthe turn-ontransientfromthepre-amplifiers. 1-1 Description TheBarney Oliver Audio Amplifier SPECIFICATIONS OUTPUT PER CHANNELFREQUENCY RESPONSE iI ! I I I -1010o100oo1000IlrrI1001 FREQUENCY III h!IT,OUT:Ii o+l-J+-.11+1-N-+-=t+-+-1I-+-+-od-.=-+-+-I_+_1 I!1i!:III -51fII!.- IIIi:iFrequency Response1.m -101+1 1/-+1-+ 1+-+-+-+-+-1-+-+-+-Hf I- IiI! -1t-+-+_-+-+-+-+-_I1_+-+_+_1_+_h._+_+_I_1_+_1 : IiiIr 18dB/octavewithcomerat5,8,10or 20kHz. Includes30dBnotchat10kHz in 5 and 8 kHz positions. VOLUME: Dual precisionattenuator,60dB range,2dBsteps.Eliminatesneedfor balancecontrol. CONTROLS INPUT:TUNER,TAPE, PHONO, AUX1, AUX 2. MODE: STEREO -DIR(ect),REV(erse), L, R MONO-DUAL,L, R BASS:FLAT,BOOST Response:RIAA,+6 dB, - 6 dB SIZE: 16.72(425mm)wide,5.0(127mm)high, 10.93(278mm)deepbehindpanel. *Both channels operating simultaneouslyat maximumoutput. *Continuoushighpoweroperationatless than8nnotrecommended. See instruction manual. tHumpickupbyphonocartridgemaycause this figure to be exceeded. WEIGHT Approximately20poundsnetwithoutcase. POWER REQUIREMENTS 115or230V.A.C.10%, 50-60 Hz,20W standbypower,135Watfulloutputinto 16n(bothchannels). 1-2 TheBarneyOliverAudioAmplifier SECTIONII FRONTPANELCONTROLS FrontPanel Controls Simplicityofoperationhasbeenachieved withaminimumofcontrols.Itis agoodideato markwithacoloreddotthenormalsettingsof specialpurposecontrolssothattheinexperienced ortechnicallynaiveoperatorneedonlych-eckthese settingsandachievegoodresultsusingonlythe inputselectorandvolumecontrol. A.INPUT Selector DUAL L R Bothchannelsmixedanddeliv- eredtobothspeakers. Monophonicreproductionof leftchanneloverbothspeakers. Monophonicreproductionof rightchanneloverboth speakers. Thisswitchallows achoiceofanyoneof fiveinputs.Fromlefttorighttheseare: TUNER TAPE Acceptsinputatline level (0 dBm)fromFM, AM,orFM/AM tuner. Acceptsinputatline level (0 dBm)fromanequalizedstereo orsinglechanneltapedeck. TheLandRpositionsallowmonophonic tapesandothersignal sourcestobereproduced overeitherone(STEREOside)orboth(MONO side) speakers. C.FILTERSwitch Thiscontrolallows various highfrequency roll-offstobeintroduced.Fromlefttorightthe positionsare: Thiscontrolallowstheleftandrightchan- nelsoftheinputtobedeliveredtothespeakers invarious ways.Thecenterpositionisnormalfor stereooperation.Fromlefttorightthemodesare: MODE Switch PHONO AUX1 AUX2 B. L Acceptsinputfromamagnetic stereophonographpickup. Acceptsinputsfromanyline- levelaudiocircuitsuchastuners, tapedecksorothersources. Leftstereochannelonlytoleft speaker. 5 8 10 20 Introducesa highfrequencycut- offat5 kHz,withanullat10 kHz. Usefulfornoisy78rpm recordsandAMreception. Introducesa highfrequencycut- offat8 kHzwitha nullat10 kHz.Usefulforgood78rpm recordsandAMreception. Introducesamaximallyflat18 dB/octavecutoffat10kHz. Use- fulforslightly noisyconditions. Normalposition.Introducesa maximallyflat18dB/octavecut- offat20kHz. R REV DIR Rightstereochannelonlyto rightspeaker. Stereochannelsreversed.Left channeltorightspeaker,right channeltoleftspeaker. Directpresentation.Eachstereo channeltocorrespondingspeaker -Normalposition. D.VOLUMEControl Adualprecisionattenuatorallows adjust- mentofthesoundlevelin2dB(orscarcely perceptible)steps over a60dB range. Because theattenuationis preciselybalancedandbecause thefeedbackassuresequalgaininbothchannels, thenuisanceandhazardofanimproperlyset 2-1 FrontPanel Controls balancecontrolare eliminated.(Note:Identical speakers are assumed.Goodqualityspeakersof goodmanufacturewill ordinarilybewithin1 dB ofeachotherovertheaudiorange. Likewisefor thetwochannelsofa good phono-cartridge. How- ever,theperfectionistmaywanttotesthis componentsandintroduceappropriatelossinto thehotside.) E.Phono Equalization Switch(-6dB,RIAA, +6 dB) BelowtheINPUTselectorcontrol,andeffec- tive only inthePHONOpositionofthatcontrol, a three-position slide switch allowssomecompen- sationforrecording defects.Inthecenter(Nor- mal) position,thisswitch providesthestandard RIAA equalization.Intheleftposition,thehigh frequency response isdroppedby6dB, while in theright position,theresponse isenhancedby 6dB.Somemanufacturers(suchasDeutsche Gramophone)conscientiouslyadheretoRIAAspec- ifications, whileothers(names suppliedonrequest) 2-2 TheBarney OliverAudioAmplifier enhancethehighendtocompensateforthe deficienciesoftheusualplaybacksystem.Ifyour speakers are flat,the-6dBpositionwillhelp correctthispractice.Ifyoufindthe+6dBposition betterinthemajorityofcases,yourspeakers(or yourears)needattention. F.BASS Switch(FLAT,BOOST) LocatedbelowthehighfrequencyFILTER controlisthetwo-positionBASS switch.Inthe BOOSTposition,theswitchraisestheresponseat 6dB/octavefrom80Hzdownto20Hz.Inthe BOOSTposition,approximatecompensationis providedfortheusual low-end roll-offofgood speakers.(Twopolesat40-50Hz).Ifyouare fortunateenoughtohaveanoverdampedpairof wooferswithreal polesat80Hzand20Hz (such as LE-15AsorALTEC411-Asin9 cu. ft.or larger enclosures),theBOOSTpositionwill closely compensatethelow-endroll-offdowntothe bottomoftheaudiorange.Forveryhighsound levels,theFLATpositionisrecommended. TheBarneyOliverAudioAmplifier SECTIONIII INSTALLATION Installation A.PHONO CONNECTIONS Specialprecautionsmustbeobservedfor thePHONOinput.Because acombinationofshunt andseriesfeedbackisusedtocontroltheimped- ance facedbythecartridgeandtherebyproduce thehighendroll-offrequiredbytheRIAArecord- ing characteristic,theLOWsideofeachinput isnotgroundedinsidetheamplifierandTHESE MUSTNOTBEGROUNDEDORCONNECTED TOGETHERexternally.(SeeSectionV, A.for furtherinformation.)Ifcoaxialorshielded wires areusedforeachchannel,thetwoinnershields mustbeinsulatedfromeachotherandfromthe outershieldaroundbothasshowninFigurel. Insomecartridges,theLOW sideofoneorboth channels isgroundedtothecasebyathinstrap atoneorbothLOW terminals.IFPRESENT, THESEGROUNDINGSTRAPS MUST BE RE- MOVEDBYPRYINGTHEM OUT ANDOFF WITH ALARGENEEDLEORPICK.Theoverall shieldshouldbeconnectedtotheturntableframe atoneendandtotheamplifier chassisattheother endusingthebindingpostprovided.Afterthis is done,testthatbothchannels are isolatedfrom groundbeforeconnectingthemtotheamplifier. TOGROUNDCONNECTION ONREAROfAMPLIfiER NOTE: Innershieldsmustnotbegroundedateither end. Alsoinnershieldsmustnotbeconnected togetheratanypoint(includingatorinside pickup).Cablesshouldhaveinsulationover shields. Outershieldmustnotmakecontactwithany TOCHASSISOfTURNTABLE ORCHANGER leadconnectingpickuptoamplifier (including innershields). Insomelocationstheoutershieldmaynotbe necessary;insuchcases,turntableorchanger chassisshouldbeconnectedtoamplifier chassis (groundterminalonrear)withaseparatewire, preferablyinsulated. Figure1.Phono Connections 3-1 Installation Thephonocartridgeshouldbelocatedasfar asis convenient fromanytransformers,motors,or othersourceofACmagnetic field. Withproper installationanda good cartridge,noAChum shouldbeaudible evenatthefull settingofthe volumecontrolandwithbassboost. B.USEOF PHONOGRAPH PICKUPSOTHER THANSHUREV15TYPEII Thephonographpre-amplifiersasshipped are optimizedfortheShureV15TypeIIpickup. Othergood quality pickupscanbeused,buta resistor changeoneachofthephonopre-amp boardsmaybe required.Theresistors inquestion are designated R1 asshownneartheleftsideof thepre-ampschematicinSectionVI,A.To determinetheoptimumvalueforR1fora given pickup,theinductanceandresistanceofthepick- upmustbeknown.Thevalueforresistor R1may thenbe calculatedbyusingthefollowingequation: rL6 R1=_0_x10-100R-20K .750 Where LoispickupinductanceinHenries, Rois pickup internal resistance in ohms,andR1 is in ohms. OncethevalueforR1hasbeencalculated R1 resistorsoneachofthetwophonopre-amJ boardsshouldbechangedtothepropervalue.For additionalinformation,seeSectionV,A. LEFTSPEAKER TheBarneyOliverAudioAmplifier C.SPEAKER CONNECTIONS Theamplifiermaybelocatedatanycon- venient distancefromtheloudspeakers. Twisted pairsofNo.18wireorlargerorordinaryzip-cord maybeusedtoconnecttheamplifierstothe speakersifthedistance isunder100feet.For longerdistances, heavierconductorsare recom- mended.Ingeneralthed-cresistanceofthe cablesorcordsshouldnotexceed5%ofthe speakerimpedance. Connectiontotheamplifieroutputsis via thetwo-terminalpolarizedJonessocketsatthe rearoftheamplifier.Thecordsorcablesmustbe solderedtothematingplugs provided,takingcare toavoidinternalshortcircuitsfromwirestrands orsolder bridges.Itisgoodpracticetoinsulate thewireandlugsfromeachotherwithelectrical tapeorheatshrinkabletubinginsidetheplug sleeveaftersoldering. D.SPEAKERPLACEMENT Theloudspeakersshouldbelocatedatthe endsofthebaseofanisosceles trianglewiththe listenerattheapex.Theapexangleofthis tri- angle, i.e.,theanglebetweenthelinesofsight tothetwospeakersshouldbeabout150to450, asshownin Figure 2.Goodsoundqualitywill thenbeheardupto450oneithersideofthe perpendicularbisectorofthelinebetweenthe speakers. RIGHTSPEAKER Figure2. 3-2 I I I I I I I I TheBarneyOliverAudioAmplifier E.LINEVOLTAGE,FREQUENCYANDLINE FUSING Unless specifically tagged otherwise, amplifiers operateonlyon115Vac line.115Vamplifiers have singlepowertransformerprimariesandcannot beconnectedfor230Voperation.(Anexternal 230-115Vstep-downtransformermaybeused.) Theproperline fusefor115Vunitsis1.6amp, slow-blow. Satisfactoryoperationwillbeobtainedwith line voltageswithin10%ofthenominal(115V or230V)value.Thelinefrequencyshouldbe 50Hzorgreater. Agroundingorthreewiresocket isrecommendedbutnotessential.Ifthechassis isnotgroundedthroughthepowercord,a separ- ategroundmaybeneededtogetridofhumon phono,mikeorotherlowlevelinputs. F.115V/230VAMPLIFIERS(European Units) UnitsshippedtoEurope(andin a few cases withintheUnitedStates)areequippedwith 115/230Vpowertransformers. UnitsshippedtoEuropewillbeconnectedfor 230Voperationandwillbeequippedwith0.8amp slow-blow fuses. Becauseofthevarietyofac plugs used,amplifiersshippedtoEuropewillnotinclude line cords.Thelineconnectorontherearofthe amplifieriscompatiblewithEuropeanlinecords, anditis assumedthattheusercanobtainthe propercord.Unitsconnectedfor230operation will beprominentlytagged. 115/230Vamplifiersshippedwithinthe UnitedStateswillbeconnectedfor115Voperation, will use1.6ampslow-blow fuses,andwillbe equippedwithstandardline cords. Theseunits willbetaggedtoindicate115/230capability. Amplifierswith115/230Vpowertransform- ersmaybereconnectedbytheuserforeitherline voltage.115Voperationrequiresconnectingthe twohalvesofthetransformerprimaryinparallel; for230V,thetwohalvesmustbeconnectedin series. -NOTE- Whenreconnectingtransformerprimaries, care mustbetakentoinsurethatwindings are connectedinanaidingsense(instantan- eousfl