M460B — Input Module

8-109 AMPL IFIER_SERIES Output Level : ina +30 dBm maximum. 1 ' 076 ,22 V? Pn:-- 226 '79 Power Requirements: +/- 21.5 volts ac, MA quiescent current _ mA +30 dBm J3 - output 3S37. 676 :)'-3 Amb ent Temperature: Celsius ~iiG30 ` ` ~3j degrees 716/62 78';" 7' Dimensions: 25" 38" 0.57" (83 Mm mm ) 002 E7'~7' 0a Mm The 8-109 comprises two amplifier sections one consisting through 04, and the other 22 with 05 through 08 with The linear integrated circuit operates as preamplifier and buffer stage drive the transistor output amplifier section In the majority the 8-109 models the inputs the two amplifier sections are interconnected as cross coupled differential pair provide balanced input.

Alternately the case the 8-109A and single-ended, unbalanced input used The balanced input yields severa input characteristics similar those an input transformer Output evel remains constant when the input fed from either balanced an unbalanced source Good common mode rejection another feature this type input configuration For amplifiers operating the balanced mode, the value R15 establishes the feed back ratio the [wo amplifier sections and thus controls the amplifier gain.

When utilized the unbalanced arrangement, the lower amplifier section (22 with 05 through 08 ) used as the input section with the input signal applied pin E2 _ Amplifier gain determined by the values R6, RII and R12. One half the balanced output signal appears pin E6 . The upper half the amplifier (21 with through 04) operates as unity gain inverting amplifier with externally strapped E6 "0a# 7-' ` The output all models the 8-109 series brought out Pins EL and E6 _ actively balanced and 93CE 6 d 2indo JCu J_^7 _ Dsor| UfJC _ 8-109-1-2

8-109 AMPLIELER_SERIES The 8-109 series amplifiers are utilized as an internal component within various WBS series audio console modules Each 8-109 amplifier mounts as plug-in assembly onto the module motherboard The 8-109 amplifier provides an actively balanced output with +30 dBm capability . emp oyed as an output booster amplifier with either balanced an unbalanced input The following specifications apply the 8-109 series amplifiers Unit Ineut U7'EF `c ; Gain Ftia= "fid I5,` < UC , -= 95" Tolyf "AAJ3 ef; CE_cTt: 8-109 Balanced 15 dB 8-109A Unbalanced 7J3i?

dB b;e 70;i' 14: J63C11 #Ct 09B Balanced dB Jnja zni : 9ri] 925.2 ~0 * - 8-109C Balanced dB 8-109D Unbalanced 29 P0[ -0 Bfn 971 3| 09E Balanced 29 dB 7159 38.3 2 ^13ab 09F Balanced 33 dB 0C6 2201- 075;|F :con 002 VJJd 8-1096 Balanced Sao b.RJo4 23 dB 40n| Teni2 Frequency Response: Noise: +/ - 0.2 dB from Hz kHz.ene 5207f Hz to 20 kHz.

]fi| 108 dBm EIN from Harmonic Distortion Less than THD from Hz kHz +30 dBm output (typically less than 027 mid-band) 27': 79).'Jmf 2t3 Source Impedance: 600 ohms less balanced unbalanced_ Input mpedances= JCc E#7 Mj id 'Uaijo 1 - 5 Isd Gme Input Levels: Ims Cn Models with balanced input: Sk ohms minimum "| 74 0t4 0o:1732 8-109A : 30k ohms 75 1206 0iT?

"vini 8-109D : 4700 ohms a R20 'sv Depending gain particular model and system operating evels_ (Refer gain specifications above. 9bom 1485)J 4ht Less than 100 ohms 2ni4 :"' ond Output Impedance: Load Impedance 600 ohms, balanced . 8-109-1-1

4-126 EQUALIZER FILTER AMPLIFIER The 4-126 equalizer filter amplifier printed circuit board utilized 2s an internal component certain WBS 460 series equalizer modules The 4-126 comprises three independent state variable filter networks aes gned operate the Low Frequency Mid Frequency and High Frequency bands the audio spectrum respectively _ Each these three filter sections functions Pass shaped portion the audio spectrum thus generating correction signal= be summed with the primary signa passing through the module conjunction with components external the 4-126 and part the main module, possible control the different parameters equalization indepen - dently eacn other, such as frequency, boost/cut and Each the three filter networks consists three operational ampli - fiers one which operates the summing mode, with the two others functioning as integrators.

the summing amplifier, the outputs the two integrators are mixed with the original filter output signal, the compound output turn being fed back the integrating amplifiers_ Depending upon where the signal inserted withdrawn from this set three operationa amplifiers, band-pass, high Pass low- Pass characteristics are achieved With the appropriate external circuitry, the 4-126 can be used generate: BAND-PASS within each BAND REJECTION characteristics the three frequency bands _ LOW-PASS positive characteristics negative SHELVING HIGH-PASS positive characteristics negative SHELVING 4-126 1-1

M460B INPUT MO DULE

The th ree s i gna ls wh l c h lene t he 4 -126 f ilt er a r e "c o r r ectlo n slg na ls - eith er in-phas e or I BO de gre!!s ou t -o f -p hase with th e eq ualiz er input and ba nd pas s 11111 ted as deterlilned by the e quel f z e r sect ion an d contr o l settings. These " co r r ec ti on s lgnals - ar-e then sUllllled to gether with the prl lury ( I n pu t) sfg n"l by the operatlon" l u p l if l e r s Zl, Z2 a.nd Z4 th us f or ll1ng th e e que t f z ed out put s ignal. Thh c on c e pt of adding" correction s t qna l together with the 1ncomlng slgn"l t o f o r lll the eqll"lized s i llnal is di rectly responslble f o r t he low no he and disto r tio n capabilities of this unit . The c ompoun d s i gn al as lIene ra.ted al o nll t he en t l r e pr o c e ss l ng c he tn a ppe a r-s at th e ou t put of Z4. Fr om he re it is r out ed t o o ne of t he no rma l ly op en co n t a c ts o f the EQUALIZ ER I NSERT s wi tc h S1I13 . t bu s , w1t h SIII 3 depr e sse d. th e euu e t t aed s l gna l t s fed to t he output ampl t r t e r a - Io gA. In additlon . as SII13 1$ depresse d . the LEO fndfca to r is ae t tve eee . B-I09AOutput Arlpl1fl e r "nd INSERT The a-l 0gA u pli f l e r ra.hes th e signa l t o - 10 dB.. nOllf na ll y . The outpu t 1$ act h e l y balanced a nd fed to the -lnsert polnt" at pfns 22 a nd Z o f lIodule connec tor PI. Th h futu re allo ws the use of in sert jacks . per.htlng t o lnse rt a.ncillary equlplle nt 1nto th e lIa f n . h i ng slgna l pa.th . PHASE Reversal The sf gna l 1$ returned to the llodule yia plns 21 and y of PI and rout ed through the PHASE REVERSAL swf tch SII2 t o th e CHANNEL ON switch S1I21. PREFADE -LIS TEN (PFL) ca

The b rfdgfng takeoff fo r the PFL o u tput r s p fcked up betwe en s.

SII2 and 51121. p BS W :// tp ht

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WAF;O ·SECK S Y STEM S LTC

M46OB INPUI_MODULE The three igna 1 $ which Teave the 4-126 filter are "correction s igna 1s ther in-phase or 180 degrees out-of-phase with the equa izer input and band pass imited a $ determined by the equa 1 zer sect ion and contro] settings These correction igna are then ummed together with the primary (input) igna by the operationa amplifiers 21, 22 and 24 thus forming the equalized output igna] This concept 0 f adding correction igna together with the incoming signa ] to form the equalized signa i5 directly responsib] e for the Tow noise and distortion capabilities 0 f this unit The compound igna 1 a $ generated along the entire processing chain appears at the output 0 f 24 .

From here it is routed one 0 f the norma ]ly open contacts 0f the EQUALIZER INSERT switch SW13 . Thus with SW13 depressed , the qualized igna ] is fed to the output amplifier 8- 109A In addition, as SW13 is depressed , the LED indicator i5 activated 8-1094_Output_Amplifier and INSERI The 8-1094 amplifier raises the s igna 1 to 10 dBm nomina ]ly The output is actively ba Tanced and fed to the insert point at pins' 22 and 2 of modu]e connector P1 This feature a ] ows the use 0 f insert jacks permitting to insert ancillary equipment into the ma in mixing s igna path 77 ^ -.' ?

PHASE_Reversal S . ` ' ' The signa] returned to the module via Pins 21 and 0 f P1 and routed through the PHASE REVERSAL switch Sw2 the ChAnnEL On switch Sw21. i? `. J] 3'_ ';'``. '._ ; PREFADE-LISTEN_(PFL) ';i ( ` .od The bridging takeoff for the PFL output is picked up between Sw2 a nd Swzi ; 3'` :'' 6 0 'J : n" ' .

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M46oB iNPUT MQDULE PART DESCRIPIION MFG MFG PART NUMBER R17) R1e) Potentiometer quad A/B WBS 10-011 627 45 R19 R2o delete GCR Fin R21 R22 R23 Potentiometer A/B WBS 10-008 37 223 3cs R24) R25 R26 R27) 20= Potentiometer, quad A/B WBS 10-002 cuf 129 :Jf 3J9 705 O54 R28 R29 R3O R3I R32 delete C 50A 0F2 05 3 'TA 57f1 Ooo Jyb R33 R34 R35 R36 R37 Resistor 1/4w 570 470k 1K 15K 15K Philips Etf 16 279 a7o 5rc 27 ` ' = {Zoh R38 R39 R4o R4I R42 Resistor 1/8w 5% Resistor 1/4w 5% 150 750 750 180 L7 7 673 Qe2 6~ 5VA R43 R4b R45 R46 R47 Resistor 1/8w 5% Resistor 1/4w 5% delete Resistor 1/4w 59 620 1M CCA 489 EBfi 77 F8{ 1SK 15k QO= Qec R48 R49 R5O R51 R52 1SK 620 15k ISk 15k Ge A 0?A GeA :isb 4-3