Pacific Recorders & Engineering SDA-8A Technical Manual Download Page 9 | Manualshive

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Summary of Contents for SDA-8A

Page 1: ...m I I I I I I I I I I I I I I I I I I 1 SDA BA STEREO DISTRIBUTION AMPLIFIER Technical Manual PR E DOCUMENT 75 15 PACIFIC RECORDERS ENGINEERING CORPORATION 2070 Las Palmas Drive Carlsbad CA 92009 619 438 3911 FAX 619 438 9277 ...

Page 2: ...www SteamPoweredRadio Com ...

Page 3: ...power supply designs are a combination of discrete and integrated circuitry All components are conser vatively rated for high performance long life operation The amplifier is constructed on an epoxy glass double sided PC board The use of an extensive ground plane shield on the component side of the circuit board in addition to de coupling and bypass techniques ensures amplifier stability in high R...

Page 4: ...revisionto this documentisreceived from PR E simply replacethe old pages with the newones discard theoldpages andpostthe newstatuspageinthefrontofthismanual CHQIE Itmaybedesirableto retain replaced status pages in order to have a record of document changes If deemed necessary by our Engineering Department comment information relating to any change may also be included on this page eaa ALL PAGE26 B...

Page 5: ...d that the readerhas a working knowledge of audio devices systems and installation practices To obtain the maximum benefit of the distribution amplifier s capabilities it is strongly recommended that the Installation Setup and Operation and Equipment Description chapters ofthis manual be read c 0mpletely prior to installing the unit Each SDA 8Aisthoroughlytestedand burned in priortopackingforshipm...

Page 6: ...icator and panel settings 1 3 SPECIFICATIONS Following is a list ofspecifications for the SDA 8A Stereo Distribution Amplifier INPUTS Source Impedance Input Impedance Input Level Range Main Input Patch Return Input Input Headroom Input CMRR Main Input Patch Return Input OUTPUTS Output Source Impedance Output Level Main Output Patch Send Output Headphone Output Maximum Output Level Main FREQUENCY R...

Page 7: ...er s warranty which is subject to the following guidelines and limitations A Except as expressly excluded hereinafter Pacific Recorders Engineering Corporation Seller warrants equipmentofitsown manufactureagainstfaultyworkmanshiporthe use ofdefectivematerialsforaperiodofone 1 yearfromdateofshipmenttoBuyer Theliability of the Seller under this Warranty is limited to replacing repairing orissuing cr...

Page 8: ...n outside ofthe environmental conditions specified by Seller F This Warranty is the only warranty made by Seller and is in lieu of all other warranties includingmerchantabilityandfl mess foraparticularpurpose whetherexpressedorimplied except as to title and to theexpressed specifications contained in this manual Seller s sole liability for any equipment failure or any breach of this Warranty is as...

Page 9: ...edon the rear ofthe unit referenceFigure 2 2 The SDA 8Arequires one rack unit ofheight 1 75 inches in a standard rack width of 19 inches The depth ofthe SDA 8A from the rack rails is 10 inches however it isrecommended that the installation allow an additional two inches to accommodaterear panel connections and cable bends Thelegendpanelismountedon thefarrightsideofthe SDA 8A adjacentto theVUmetere...

Page 10: ... signal wire back about 3 16 inch and sleeve the shield at cable ends with heat shrink tubing NOTE It isveryimportanttosleeve thecabledrain wire and the shield atcableends with heat shrink tubing This is the only means ofassuring an installation in accordance with recommended grounding procedures TheMolex pins are designedso that the shorttab ears arecrimpedonto the stripped wire to make the elect...

Page 11: ...onnection Sec Figure 2 2 for an example ofthe SDA 8A s rear panel configuration NO I t IEAIA f 10 _ EBB BES AIITM l 2 ttlYM MHZ 112A I I P ATCH 11 1H USA uc111caa _ I OUTPUTS J FIGURE 2 2 REAR PANEL CONFIGURATION SDA 8A audio input connection is accomplished bymeans ofa 6 pin Molex connector located on the rear panelassembly Pin assignmentfor both stereoandmonaural applications isdefined inFigure2...

Page 12: ...put Rloht Output 4 5 6 FIGURE 2 4 AUDIO OUTPUT CONNECTION NClTJt When using the SDA 8A for monauaral distribution pins 1 through 3provideone output and pins 4 through 6 provide another This increases the number ofoutput connectors from 8 for stereo applications to 16 for mono applications 2 6 PATCH POINT CONNECTION Thepatch connectorallowsfor the insertion ofsignalprocessingequipment atapointprior...

Page 13: ...Shields ofcables connecting the console to auxiliary equipment should be connected at the console end only and should not be terminated to the ground ofthe auxiliary equipment B Ensure that the auxiliary equipment is connected to a clean ground by its power cord assembly orby the addition ofa separate ground wireconnected betweenthe chassisofthe auxiliary equipment and the station s technical grou...

Page 14: ...HT and SUML R In theSTEREOmode indicatedbytheilluminationofa greenLED theamplifierdistributesastereosignal to the eight stereo output connectors located on the rear panel In each ofthe three monaural modes LEFT RIGHTorSUM L R indicated by the illumination ofa redLED an identical signal is sent to both left andrightchannel outputson each rearpanel connector The LEFfmode sends the leftchannel input ...

Page 15: ...mination ifnecessary bymeansofthe600ohmTERMination buttonlocatedontheSDA 8A s front panel assembly adjacent to the ON LED referenceFigure 3 1 This button will be orange when the 600 ohm termination is implemented and black when it is not 3 6 LEVEL ALIGNMENT The SDA 8A is factory calibrated at the time ofshipmentfor an output level of 8 dBm unless a level of 4 dBm is specifically requested with a 1...

Page 16: ...ON AMPLIFIER 6 Replace the patch connector shorting plug or re connect the processing equipment and connectthe l kHzsignalgeneratortotheSDA 8A sLeftInputConnector Setthe generator s outputvoltage to be the same as the output level ofthe sourceequipment to beconnected to the SDA 8A s input 7 Using the front panel STEP GAIN and GAIN control switches adjust the amplifier s input gain until the Left V...

Page 17: ... R8 serves to attenuateany common mode signalcomponentto withinthe Ommon moderangeoftheadjustable gainamplifier Trim potR24and resistorsR12andR14providecommonmodebalancefortheattenuatorcircuit Likewise C23provides high frequency common mode balance for input filter capacitors Cl and C8 The adjustable gain inverting amplifier is configured with three operational amplifiers on a plug in function mod...

Page 18: ... ofMODE selection relay Kl drives variable gain bufferamplifierUS The voltage gain of U5 is adjusted by trim pot R43 accessible through the SDA 8A s top cover and has a gain range of7 dB to 14 5 dB The output ofU5 is connected to line amplifiers Al and A2 which operate as apush pull pair to provide balanced drive to the distribution output lines Al and A2 are plug in function modules designed to d...

Page 19: ...ipolar16voltsupplyispoweredfromtwoseparatewindingsofpowertransformerTl wiredinacenter tapconfiguration Thesecondariesarcrectified bydiode bridgeCR12 andfiltered bycapacitorsC1and C4 U1 is a positive and U2 a negative integrated circuit adjustable regulator The various small componentsaround the regulatorsare used tosettheoutputvoltage andimprovethe noiseandtransient response of the regulators 15 R...

Page 20: ...shaft the ability to clutch slip when excessiveforceisapplied andnoholesinthesideoftheknobforthesetscrews Toremoveacolletknob carefully pry offthe topcap ofthe knob using an Exacto knifeorsimilar tool Use PR E tool 70 44 as shown in Figure 5 1 to turn thenut on thecollet counterclockwise Once the nut is loosened the collct shouldrelease from the shaft This nut should notneed to be removed unless t...

Page 21: ...nnect any one of the SDA 8A s left outputs to a Sound Technology 1710 Distortion Measurement System or an AC volaneter 3 Rotate the front panel left gain trim pot and front panel left gain step switch fully counter clockwise 4 Adjusttrim potR8 onoutputamplifierfunctionmoduleA3 asshowninFigure5 3 toobtain a minimum output level S Rotate the front panel left gain trim pot fully clockwise 6 Adjust tr...

Page 22: ...levelareobtainedandconfirmed 12 Return the front panel left gain trim pot to the fully counterclockwise position RIGI ITCHANNEL ADJUSTMENT 1 Connecta 20Hzbalancedsignalat a reference levelof 20dBmto theSDA 8A sright input per the connection diagram shown in Figure 5 2 2 Connect any one of the SDA 8A s right outputs to a Sound Technology 1710 Distortion Measurement System or an AC voltmeter 3 Rotat...

Page 23: ...0dBmreferencelevelareobtainedandconfirmed 12 Repeat steps 8 through 11 until minimum output levels are obtained then return the front panel right gain trim pot to the fully counterclockwise position NOTE Once both the left and right channels have been CMRR adjusted the SDA 8A must be level aligned per the procedure contained in Section 3 6 ofthis document 5 4 REPLACEMENT PARTS Mostofthecomponents ...

Page 24: ...EDs Diffused Red Panel Mount Green Panel Mount Red Nut Cover Black for S110 knob Potentiometer Single IOK CCW Mod Log Regulators Variable 1 5A Pos LM317T Variable 1 5A Neg LM337T Shorting Plug Assembly Switches Pushbutton Black Orange Rotary 1Pole 4 Position Transistor Diode Assemblies MJE171 1N914B MJE181 1N914B Trimpots Multi tum Cermet IOK ohm Multi tum 50 ohm Single tum Cermet lOK ohm 20 SOA 8...

Page 25: ...ng schematics and drawings 6 1 Stereo Distribution Amplifier Schematic 6 2 Output Amplifier Function Module Schematic 6 3 Instrument Input Function Module Schematic 6 4 StereoDistribution Amplifier PC Assembly NOTE OnPR Eschematics capacitorvaluesarcin microfarads µF unless otherwisespe cified and resistors arc 1 4 watt 5 unless otherwise specified 21 REVISION A ...

Page 26: ...IJN C2 10 20 TANT C5 10 20 TANT CR2 IN4001 CR4 IN4001 RI 237 _ II R2 2 90K ti R4 2 BOK II R3 237 II C3 10 20 TANT cs 10 20 TANT EIS TO C MRa PANEi U2 CR3 IN4001 PACIFIC RECORDERS ENGINEERING CORPORATION 6 6 1 GRll tO SY 480 S A WIO CCMOI LOGIC C GRll tO PLAHE rh CW SSIS GnHl REFERENCE 0 SIGNA10R own LA S US 0 I NJS 0 Cl5J Ctl 15 22 24 54 106 113 115 124 CR 09 CR5 8 It ll 14 108 DS107 DS1 5 8 105 E...

Page 27: ...K IS I I I Ct I I I t l00 16 I I Sl JW I I I I 1 S I I 1 R7I 321 1 At69 Rt70 Rt7I 43 21 U 13 71 U 32K U I I I I I 5101 1 ____ _ a 17 ____ Cit I I I 1100 1 I I a oi M Al7 IK Rt72 21 u CIII 1r F A2il 39A Ct2 220 16 A27 1001 Al27 1001 I _ 3 Pl1Cl1 SIJC IHI HI lilf r ll J6 jjJ2 10 u jfCH S C ij1 fI 1il o I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I w 10 SH 3 A I PAIOI S C ...

Page 28: ...1 22 25 CUI 22 25 CJII 22 25 l4 o I I I EB I I I I I I I I I I I I I I I I I I I I I I I Ell 10 llll Ml MM I llll lO MM I l lllO MM1 1GH1 HJ WM I uiMl lO Cll1PJ1 I l lllD MP 111 1111 J9AI jJJ Ji llrt I OJIM l RIO l9 1 2 11 0 1 _l c O OJ TT lM l All 39 1 2 fn 1 mo MM i I rn I OJGHl Jl All l I lO Al2 JIIAl 2 1 Jl l IClD All 39Al tf Uri HI MM RU 39A1l 2 1 lCfl lO Cl JIM l IClD MM AJQII HI MM AIQn lO ...

Page 29: ... g C7 18 I C50 IOOl f ce RSC tOo U I C5J t 8 22 25 P I 20K U 22 25 of I I At5C cu 20K u 22 Z J II r Cl52 22 Z J II J OCK Al8t Al85 101 U J 57K u I CIC3 Cl 8 IOOPf I rl04 SH 3 LIOJ Al82 IOI FR SH 3 LIOC g fl04 SH I Jl S Rl56 I 13 71 Al83 l J IJ 5 C9K u fl04 SH t Jl 4 _ 05108 05107 CIC9 7 16 II Ct50 I IOCl f c e RISC tOK l l I Ct53 At c ca Al80 22 25 II 20K u 22 Z i IK I J 6 1 STEREO DISTRIBUTION AM...

Page 30: ... IN 3 1 PACIFIC RECORDERS 6 ENGINEERING CORPORATION R1 1Kn 7 2 C1 0 1 C2 22pf 6 C3 0 1 R2 3 9Kn C4 22 7 5 cs 22 2 5 R3 3 9Kn CR1 CR3 1N914B 1N914B C6 0 1 CR2 CR4 1N914B 1N914B 01 MJE181 R4 4 7n 1 2 W RS 4 7n 1 2 W 02 MJE171 1 2 I 3 6 2 OUTPUT AMPLIFIER FUNCTION MODULE SCHEMATIC 26 ...

Page 31: ... 1 A GROUND PLANE MATCHED PAIRS PACIFIC RECORDERS ENGINEERING CORPORATION R2 S 23KQ 0 1 C2 200pF I I I C3 200pF RS S 23KO 0 1 C4 0 7 161 R7 10KQ 0 1 llfo cs f 100pF R9 10Kn 0 1 A _ RB 10KO 0 1 7 C6 0 c 2 Fl77 16 CB 0 6 l C9 100pF R10 10K0 0 1 L1 _____ I 1 I I 4 I I 9 clJ 6 3 INSTRUMENT INPUT FUNCTION MODULE SCHEMATIC 27 ...

Page 32: ...I 115 388 0 I 0 n PACIFIC RECORDERS 6 ENGINEERING CORPORATION r 0 00 IZ lZ J I o o SJ oo 10 0 0 0 10 0 l o 0 1 o oJ Sf 0 0 0 0 0 0 o 0 0 0 lPLUlbC llbJ f JT OJ oio 1JJt 11 5Jr JAJJ T1 P 5tJLl K P 1 5 fO 6A D Pt II IE 6 4 STEREO DISTRIBUTION AMPLIFIER PC ASSEMBLY 28 ...

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