M462B

8-109 AMPLIFIER SERIES The 8-109 scries of amplifiers are utilized as an internal component within various WBS serics of 2udio console modules. Each 8-109 amplifier mounts a5 plug-in assemibly onto the module motherboard. The 8-109 amplifier provides an actively balanced output with +30 dBm capability . It is employed 35 an output Or booster amplifier with either balanced or an unbalanced input. The following specifications apply I0 the 8-109 series of amplifiers . Unit Jnput Gain 8-109 8-1094 8-109B 8-109C 8-109D 8-109E 8-109F 8-109G Balanced Unbalanced Ralanced Balanced Unbalanced Balanced Balanced Balanced 15 dB dB 18 dB 39 dB 29 dB 29 dB 33 dB 23 dB Frequency Response +7- 0.2 dB from 20 Hz t0 20 kHz Noise: -i08 dBm EIN from 20 Hz t0 20 kHz . Harmonic Distortion: Less Than 0 .1% THD from 20 Hz I0 20 kHz at +30 dBrn outpul (typically Tess than 0 .027 4[ mid-band) . Source mpedance: 600 ohmns Or Iess, balanced Or unbalanced Input mpedances: Models with balanced input: Sk phms minimum; 8-1094 : 30k ohms 8-1090 4700 onms . Input Levels: Depending on gain or particular model and svster operating Tevels. (Refer [0 gain speci - Tica tions above. Output mpedance: Less than 100 ohms Load Impedance: 600 ohms, balanced 8-109-1-1

8-109 AMPLIEIERSERIES Output Level +30 dBm maximum. Power Requircments: +/ - 21.5 volts dc, 18 MA quiescent current 65 MA at +30 dBm output_ Ambient Temperature: t0 60 degrees Celsius. Dimensions: 3.25" 3.38" 0.57" (83 mm 86 MM 15 mm ) _ The 8-109 corriprises [Wo amplifier sections, one consisting of 21 with 01 through 0l, and the other of 22 with 05 through 08 _ The linear integrated circuit 21 operatcs a5 preamplifier and buffer stagc t0 drive the transistor ouipui amplifier section . In the majority of thc 8-109 rriodels, the inputs of the [Wo amplifier seclions Are interconnected as cross coupled differential pair t0 provide balanced input. Alternalely in (he case 0t the 8-109A and D single-ended, unbalanced input is uscd. The balanced input yields several input characteristics similar t0 those of an input transformcr. Output Tevel remains constant when the inpul is Ted from either balanced or an unbalanced source . Good common mode rejection is another fealure of this type of input configuration For amplifiers operating in the balanced mode, the value of R1S eslablishes the feed back ratio of the [wo amplifier sections and thus controls the amplifier gain. When utilized in the unbalanced arrangement, the lower amplifier section (22 with 05 through 08) is used a5 the Input section, with the input signal applied T0 Pin E2 . Amplifier gain is determined by the values of R6 , RII and R12 One half of the balanced output signal appears 4[ pin E6 . The upper half of the amplifier (Z1 with 01 through 04) operates 25 unity gain inverting amplifier with EI externally strapped to F6 The ouiput of all models of the 8-109 series is actively balanced and is brought DUI 4[ pins E4 and E6 8-109-1-2

DESCRIPIION 8-109 AMPLIFIER_SERIES inverting amplifier with El externally strapped t0 E6 _ The output 0 f a1 1 mode ]s 0 f the 8-109 series is actively ba lanced and is brought out at pins E4 and E6 8-109-1-3

PARTS List 8-109 AMPLIEIERSERLES 8-109 PART DESCRIPT ION MFG MFG PART NUMBER C1 C2 C3 CL C5 Capacitor 33 uF/10 Kemet T3900336m010AS 10 uF/25 V T390c106m02545 4.7 PF Philips 2222-638-09478 C6 C7 CB c9 C1o 15 PF 10 PF 68 PF 10 LF/25 L,7 pF 2222-638-10159 2222-638-10109 2222-638-70689 T390C 1O6MO25AS 2222 638-09478 Kemnet Philips Cil C12 C13 C1l C15 15 pF 10 PF 68 pF 10 uF/25 220 uF/10 V 2222-638-10159 2222-638-10109 2222-638-70689 T390c106MO25AS T390F 227M010AS Kemet C16 C17 delete CRI CR2 CR3 CRL Diode Fairchiid INLILB 01 02 03 0L 05 Transistor National PN3569 PN3645 2N2102 2N4O37 PN3569 06 07 08 PN3645 2N2102 2N4037 RI R2 R3 RL R5 Resistor 1/4w 5% 47K 47K 6K2 6k2 6K2 Philips 8-109-2-1

8-109 AMPLIEIER_SERIES Output Level: +30 dBm maximum. Power Requirements: +/- 21.5 valts dc, MA quiescent current MA +30 dBm outpul. Ambient Temperalure: 60 degrees Celsius. 25" 3.38" 0.5711 (83 Mm Mm mm) _ Dimensions: The 8-109 comiprises [Wo amplifier sections, one consisting through 04, and the other 22 with 05 through 08 21 with The linear integrated circuit operates as preamplifier and buffer stagc drive the transistor Quipul amplifier section.

the majority thc B-109 miodels, the inputs the two amplifier seciions are intercannected cross coupled differential pair provide balanced input. Alternatelyv (ne case the 8-109A and single-ended, unbalanced input uscd. The balanced inpul yields several inPut characteristics similar those an input [ransformcr Output level remains constant when the inpul Ted Trom either balanced an unbalanced source Good common mode rejection another fealure (his [ypc input configuration.

For amplificrs opera ting in Ihe balanced mode the value R1S eslablishes the Teed back ratio the [wo amplifier seclions and thus controls the amplifier gain. When utilized in the unba anced arrangemeni_ Ihe lower amplifier section 22 with 05 through 08 } used a5 the Input section, with (he input signal applied pin E2. Amplifier gain determined by the values R6 , RII and R12 One half the balanced outpul signa appears pin E6.

The upper half tne amplifier (Z1 with through 04) operates as unity qain inverting amplifier with externally strapped E6 . The ouiput all models the 8-109 series brought DUi pins E4 and E6_ actively balanced and 8_109-1-2

8-109 AMPLIFIER SERIES The 8-109 scries amplifiers are uilized an internal component within various WBS serics eudio console modules Each 8-109 amplificr mounts as plug-in assembly onto the module motherboard_ The 8-109 amplifier provides an activcly balanced output ith +30 dBm capability. employed an output boosier amplifier with either balanced an unbalanced Tnput. The following specifications apply (he 8-109 series amplifiers.

Unit Jnput Gain 8-109 8-1094 8-109B 8-109C 8-109D 8-1 09E 8-109F 8-109G Balanced Unbalanced Ralanced Balanced Unbalanced Balanced Balanced Balanced 15 dB 7 dB dB 39 dB dB 3 dB dB dB Frequency Response: Noise: +/- 0 .2 dB from 20 Hz kHz 108 dBm EIN from Hz kHz . Harmonic Distortion: Less [han 0 .1% THD from +30 dBrn ouipul (typically mid-band) Hz 20 kHz ess (han 0 .029 Source Impedance 600 ohms or les5, balanced or unba anced Input Impedances: Models ith balanced inpul: Sk ohms minimum 8-109A : 30k ohms 8-1090 4700 onms Input Levcls Depencing gain particular model and svster operating levels (Refer gain speci - fications bove Output Impedance: Less (han 100 onms Load mpedance: 600 chms balanced 8-109-1-1

M46 28 EQUALIZER_MODULE Input The input signa 1 enters the 04628 module via pins and 0 f the edge connector 21 and 22 serve a $ the preamplifier R26 15 part 0 f the rcuit and used to s et the overa]1 Ecean? equalizer gain uni; ty The output 0 f the preamplifier 1$ outed direct to one 0 f the norma ] Iy cTosed contacts 0 f the INSERT switch Sw3 to a ]ow bypass ing 0 f the equa]izer Additionally the preaMp output fed t0 23 the first 0f four cascaded summ ng amp]ifiers 23 through 16 Siqna processing 23 through 26 serve a5 mixing and iso]ation amplifiers They are used to mix the primary nput gna with correction s igna1 derived from the outputs 0f the 4-112 filter networks resulting in rajsing or owering the Teve1 0 f selected portions 0 f the audio spectrum Additiona]ly , they isolate the filter networks from each other and prevent interaction between them, result ng dccurate and repeatab | e equalizing performance The CUt/Boost contro 1 s R13 RI4 RI5 and R16 feed an in-phase or out-of-phase iona1 gna to the buffer amp]ifiers 8r288rFe 27 28 29 and respectively The eve] 0 f the s igna 1 fed to the buffers dependent on the Cut/boost contro | setting with maximum Teve occurring at e1 the end the potentiometer and nu1 s et ng at the potentiometer mid-position Ful1 clock- wise or ful1 counterc ockwise potentiometer sesfings wi)1 resu]t in the max muM equa izat on excursions 0 f +1 dB a nd -15 dB respectively _ The 0 f buffer amp 1 fiers 27 28 29 and Z10 are routed 9etrutiz to the printed circuit board which contains four band- pa 5 5 filters corresponding to each 0f the four sections 0 f the equalizer Each band-pas $ filter pass es only portion of the gna de1 vered t0 it from the buffer Wi = th the center and band width determined by the FREQUENCY, frequency and PEAK/SHELF contro] 5

H462B EQUALI ZER MODULE

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PARTS LI ST

M462B EQ UAL IZER MOD UL E

PAR T DE SCR IPTI ON MFG SWl Swi t c n Sch ado w '" WO , PART NUMB ER

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M4628 EOUA LI ZER MODUL E

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4-112 EQUALIZER ELIER AMPLIELER PART DESCRLPILON C45 Capacitor 68 uF/6 V C46 , C47 0 .065 uF comb i ned c48 10 Capacitor '4P635 C49 V C5O MEG MEG PART NUMBER Kemet Aselco Philips Keme t T390D686MOOAS (factory selected) 2222-638-10109 T390B105M035A5 R1 R2 R3 R4 R5 Resistor 4w 59 10k 10K 6202 22K IK Philips R6 R7 R8 R9 RIO 22k IM 6k2 4K7 6 202 RII R12 R13 R14 R1S IM 6k2 6200 10K 10K R16 R17 R18 R19 R2O 6200 22k IK 22k IM R2 1 R22 R23 R24 R25 6K2 6 20 6K2 IM 6202 R26 R27 R28 R29 R3O 10K 10K 6 202 22k IK R3 | R32 22k IM 4-112-2-2

PARIS LLST k-12 EQUALAZER FLIER AMPLIFER PARL DESCRIPILON MEG MEG PARL_NUMBER R33 R34 R35 R36 R37 Resistor #w 57 6k2 620n 6K2 IM 6202 Philips R38 R39 RL0 R4 1 R4 2 10k I0K 6202 22K 1K 22k IM 6K2 6 202 Resi stor 4w 5% IMo R4 3 R44 R45 R46 R4 7 R48 R49 RSO 6K2 4KZ 6202 ntegrated circuit Nat. Semic. LMZOIN 8 26 28 29 210 Zi1 212 WBS recommends the us@ of replacement parts Made by the specified manufacturers for continued optimum equipment performance 4-112-2-3

high FREQuE HCy section FREQUENCY ADJUsTHENT Controi Cont nvous variable {rom {025 Khz the PEAK|NG moce Lhe {requenc ibra refers the center frequency Ene shaped PEAK ING response curve the SheLviNG Moo Lhe Tbration fines the corne poiot from the Iaaaemlen ava Iab le SheYiNG boost cuT of 15 WB5 44628 326412 8 high Frequenct section _ F^OuusTpeNK AVlons varyi the 0 fector che Iter for 53812 E0 I0. inoperat Iv che SHELVING mode KF 0-€-#H? high FREQUENcY section. BDOsT/CUT control R13 Cont nuous iable from t0 +15 dB Sets gain or los5 of high frequenc content the Program material Hith re ference Ehe nomi na | Ieve Kigh FrEqueHcT section HOdE SELECTOR switch Shi: Knen Ocpressed tne sec ion the equa |izer operates che SHELVING mode . Hhen eased= Ehe PEAK mode se lected- MF1 hid FREQuENcY sec [ions FREQUE NCY ADJusThEnT controi$ R5 and R7, RB: Cont inuous variadie FTo %o from 12.8 KHz KhI The Ibrations refer the respec center requenc ies the be | -shaped PEAKiNG esponse curves 0-€&kh Kid FREQUENcT sections BOoSI/cuT contcois ana RiS: Cont nuous iL iab FoM +15 dB. Sets gain Jos$ mid requency content che Eeria hith reference nonina Ieve Rrogtem Hid FREQUENCY sect iOns = Q Adjusthents and the Q-factor 0 $ Ehe Pik/4 filters for va Iucs fron MF2 LOR FREQUE NCY section _ FREQUENCY ADJUS THENI contro Rio, RI: conti nuous variable fron 25 [0 Loo the PEAK|NG mode the Qveacensy clibra ion refers the center {requency Ine I-shaped PEAKING response curve [ne SheLvING mooz the ca | ibration def ine5 che point {rom The max imum ava Iab le SAECe nG 8oost or CUt 0-€-kHz 50 40O 200 Lol FREQUENcY sec [ ion, ADJUSTHEHT R12: lors vary the Q factor %f the PeAkiNG ter 17302 for I0 . R12 noperative [he SHELViNG mooe 20 €H10_ Lo7 Freque Ncy section, BOOST/cUT control Ri6 = Continuous var iable ron Set5 gain loss Ior frequenc content of the,program material with reference the nonina eve Lor FREQUENCY sectIon, Hode SELEcTOR seltch ShZ : nen depresscd, the sction the equa |izer the SHELVING mod _ Hnen re Ieased, SpetPESR NG mode ected EQULIZER NseRT suitch Sw3 : Hhen Zerressed this tch insers tne 046 28 EQUA nto [he igna Path and activtes ss0C ted LEd Khen Jeased {he unequa ized nput igna bxpasscd directly the Outdut_ 1C/77 ESUDATE REDRAWN REVISION WBS WARD-BECK SySteMS DRNPoly ENG CKD Rull App SCALE M4628 EQUALIZER MODULE

M462B_EQUALIZER_MODULE PART DE SCRIPTION MFG MFG PART NUMBER R43 R44 R45 R46 R47 Resistor Yw 5% 15K 10k 15k 620 15k Philips R48 R49 RSO R51 R52 6k2 6kK2 Resistor YW 5% 4K7 #w 5 % 15k 4K7 R53 R54 RS5 R56 R57 470 4K7 75k 620 15k R58 R59 R6 0 R61 R62 75k 620 15k 75k 620 R6 3 R6 4 R65 R66 R6 7 15k 4K7 470 4k7 75k R6 8 R69 R70 RZI R72 620 15k 15k 5 6 5 6 R73 R74 R7 5 R76 R77 5 . 6 5 6 4k7 4K7 470k

PARIS LIST M462B EQUALIZER MODULE PART DESCRIPIIOn MEG MFG PART NUMBER SWI Sw2 Sw3 Switch Schadow WBS 11-002 WBS 11-005 21 22 23 24 25 Integrated circuit Nationa] LM2O1n 26 27 28 29 210 WBS recommends the usc of replacement parts ma de by the specified manufacturers for continued optimum equipment performance 4-5

PARTS LIst M462B EQUALIZER MODULE CONTROL KNOBS, CAPS AND BUTTONS USED ON