M480C — Input Module

Mhaoc inPUT MODULE QUtPUL Amplifier (Cont_ This oulput i5 routed to the Attenuator Insert point, appearing 0 module connector pins 16 & T It is also connected to the Solo/Cue switch SW12, the Pre/Post switch Sw7 of the Auxil iary output and t0 the PGM/PEAK Indicator circuilry _ Booster Amgl lifier The output frOm tne external mixing attenuator is connected to pins 10 & and in turn fed to the booster amplifier input vid coupling capacitors, C40 and C41 The actively balanced booster amplitier circuity, consisting of u7 with its associated componen [S, provides 15 dB of gain t0 recover the loss incurred with the fader placed in its nominal 15 dB "in-hand" setting. The output signal trom this amplifier is coupled [0 tne module outputs via capacitors C44 and C45_ Pan Control The Pan Control R8o/R81/R82/R83 allows cross-fade 0f the output signal to be made between the M1 and the M2 outputs. This control 15 only active when the Pan Insert swilch Sw8 is depressed. Master Assignment The booster amplifier output is ruuted to the master assignment switches SW9 and Sw1o via the pan circuit. MI and M2 outputs are current sources and operate into zero Tmpedance summ ing nodes via 91k ohms mixing resistors. The M1 and M2 assignment switches also provide DC control contact closure for external signal ing Tt should be noted that thesc contact closures arf intended to operate with smal signall ing voltages and currents only To minimize the possibility of creating Sw i itching transients within the audio system i[ is recommended that external control buffers be ulilized to isolate inductive relay loads, large in-rush currents from incandescent Iamps, ctc . 2-3

WARD-BECK systems LTD CIRCUII DESCRIPHION Ma8oc inPuT MODULE Aux QutPut An Aux output i5 prov ided to feed an auxil iary mixing bus. The Pre/ Post switch Sw? al lows the signal to be picked up either ahead of the fader (Pre) Or after the fader (Post ) When the fader is Sel t0 its nomninal 15 dB in-hand selling, the levels of either the Pre or the Post position are equal Potentiometer R9o is the level control for the AuX channel and switch Swi| is the assignment switch. The AuX oulpul, appearing 4[ pins & D of the module connector is designed as 91k ohms current source, operating into the zuro impedance summing node of the Aux mi xing bus_ Solo/Cue Output The signal for tne Solo/Cue circuil is bridged of f the Output amplifier output at pins 16 and routed through SW12 to summing resistors R97 and R98 ,_ The Solo/Cue output appears at pins & E of the module connector . The Solo/Cue switch Sw12 also provides DC control coniacl [o effect control of external circuitry. PGMPEAK_Indicators PGM/PEAK Indicator provides visual Ievel indication for the M480C . The two-color LED DS2 will flash green ith normal program Ievels of vu and above 4 [ the fader insert point. It wiii change to red 4[ approximetely +22 dBm to indicate Peak overload condition Indicator threshold trim control R104 and resistors RiOS t0 R1o7 set the reference voltages for comparators U8A and u8B The outputs of comparators UBA and UBB are normally high Tor audio levels below the calibrated threshold points Comparator UBB is activated for norMa program levels of vu or greater . The oulput ol u8B going low turns on 05 i luminating the green seclion ol Ds2 (note 04 is on at this timc ) When the preamplifier output reaches peak level of approximately +22 aBm UBA is activated. Pin of UBA qoe5 low turning on 03 Muminating the red section of DS2 . Simultaneity 04 Ts turned off, remov ing the drive current t0 the green section of DS2 . 2 4

WAAD-BECK Bystemb LTD CIRcUIT

M48oc INPUT_MODULE Qutput_Amplifier (Cont This output routed the Attenuator Insert point, appearing module connector pins also connected tnie Solo/ Cue switch SW12, thc Pre/Post switch Sw7 thie Auxiliary output and the PGMPEAK Indicator circuilry . Booster Amp ifiec The output fromi [ne exlernal mixing attenuator connected pins and turn fed the booster amplifier input via coupling capacitors_ C40 and C41 The actively balanced booster amplitier circuity consisting u7 with its associated components, provides dB gain recover the loss incurred with the fader placed its nominal 15 dB "in-hand" setting The output signal trom this amplifier coupled the module outputs vla capacitors C44 and C45 Pan Control The Pan Control RBO/R8I/R82/R83 allows cross-fade the output signal be made between the MI and the M2 outputs This control only active when thc Pan Insert witch Sw8 depressed Master Assignment The booster amplificr output rouled the master assignment switches SW9 and Sw1o via the pan circuit.

M and M2 outputs are current sources and operate into zero Tmpedance summing nodes via 91K ohms mixing resistors The M1 and Mz assignment switches also provide DC control contact closure for externa signalling. should be noted tha thesc contact closures are intended operate with smal | signalling voltages and currents only To minimize the ossibility crea ting switching transients within the audio system ecommended that externai control buffers be ulilized isolate inductive relay loads arge in-rush currents from incandescent lamps, etc 2-3

M48OC INPUT MODULE Input Sensitivities: Line: Mic: Mic/Pad: 20 to +10 dBm (ref 600 ohm source) ~70 Lo ~-40 dBrn (ref.150 ohm source ) =50 to -20 dBm (ref 150 ohm source) Frequency Response: +/ - 0.25 dB from 30 Hz Lo 20 kHz . (Equalizer in bypass position) Noise -125 dB EIN at maximum Sensitivity (20 Hz L0 20 kHz ) 75 dB S/N with Sensitivity set t0 +8 dBm Linc in (20 Hz t0 20 kHz ) Harmonic Distortion: Less than 0. 357 THD from 30 Hz to 20 KHz at +27 dBm or less 4t insertion point. Less than 0 .17 at kHz at +27 dBm. Equalizer controls in flat positions 0r not inserted. Source Impedances: Line: Mic: 600 ohms or less balanced/unbalanced. 150 ohms, balanced/unbalanced Inpul Impedances Line: Mic: 30 ,00o ohms . 750 ohmis minimum Output mpedance Less than 100 ohms (at Inscrtion point) s0k ohms to 180k ohms current source (at module outputs) - Load Impedance: 600 ohms, balanced (at insertion point) _ Less than onms (at module outputs) Output Level: dBm nominal +27 dBm maximum (at inscrtion point) Phasing: Input and Output terminals designated by numbers are in phase .

WARD-BECK SYBTEmB LTD

M480C iNPUT MODULE Equalizer Controls: LF Section: Shelving Lype of equalization +/- 15 dB maximum range 0 L 100 Hz . MF Section: Bell-shaped type of equalization with selectable for 1.5 or 5 , Center frequency continuously variable from 400 Hz [o 6 khz . +/ - 15 dB maximum range at center frequency HF Section Shel ving type of equalization +/ - 15 dB maximur range at 10 kHz . Power Requirements; +/- 25 volts dc, 60 IA nomninal 100 MA Maximum. Ambient Temperature: to 60 degrees celsius Dimensions: 1.6" wide 10.0" high 5.6" deep (41 mm 254 mm 142 (I Weight: 1 .7 Ibs (750 gms) 1-2

WARD-BECK Systems LTD; CIRcUIT DESCRIPTON M480c INPUT MODULE The M48oc Input Module provides the necessary input selection, equali - zation and output assignment for the operation of cach input channel of the T1202A transportable console- Input Input Selector switches Sw2 (A/B Select ) and SW4 (Mic/Line Select) permit the selection of inputs between two Iine and two microphone sources Sw3 inserts 20 dB pad into the microphone inpul. SW1 selects the +LBV phantom power for condenser' microphone applications The module input presents bridging load of grea ter than 750 ohms t0 microphone Sources and 30k ohms 10 Iine sources. AI selected inputs to the module are transformer coupled to thc preamplifier circuity Preamel ifier The secondary side of the input transformer T1 cannects t0 the pre= arplifier, comnprising 01,02,U1 and their associated components. Sen - sitivity control R25 allows continous level adjustment of all input signals over range of 30 dB _ The Sensitivity control permits one [0 operale with microphone input level variances Trom 70 dBm [0 ~L0 dBm (-50 dBm [0 20 dBm with pad inserted) and Iine input levels Trom 20 dBm to +10 dBm for the same nominal output level of dBm . Equalizer The signal output from the preamplifier is fed to the output amplifier via the Eq insert Swi tch, SWs This signal is also fed to the equalizer mix amplifiers u2. These amplifiers also receive feeds from the equalizer filter circuitry. R29 is the cut/BOOST Con trol for the High Frequency section of the equalizer and feeds an in-phase or out-of-phase proportional signal Trom the input or trom the output of UZA Lo the summing input of U2A via capacitor C15 and resistor R33 . Depending upon its phase, this signal is either added or subtracted from the main signal through U2A affecting cut or boost to the high frequency portion of [he audio spectrum 2-1

WARD-BECK SYSTEms LTD_ CIRcUIT

M48OC INPUT MODULE Input Sensitivities: Line: Mic: Mic/Pad +10 dBm (ref 600 ohm suurce) ~40 dBrn (ref-150 ohm source) -20 dBm (ref.150 ohm source) ~70 -50 Frequency Response: 0.25 dB fromi Hz 20 kHz . (Equalizer bypass position) . Noise: -125 dB EIN maximum Sensitivity (20 Hz 20 kHz) . dB S/N with Sensitivity set dBm Linc (20 Hz 20 kHz ) Harmonic Distortion Less than 0.357 THD from Hz 20 KHz dBm less at insertion point.

Less than 0 .17 kAz +27 dBm . Equalizer controls flat positions not inserted_ Source Impedances Line Mic 600 ohms less balanced/unbalanced_ 150 ohms, balanced unbalanced Inpul Impedances Line: Mic: 00o ohms 750 oNmis minimum Output Impedance: Less than 100 ohms (at Tnscrtion point) s0k ohms 180k ohms current source (at module outputs) oad Impedance: 600 ohms, balanced (at insertion point) _ Less than ohms (at modul- outputs) Output Level: dBm nominal +27 dBm maximum (at insertion point) Phasing: Input and Output terminals designated by numbers are phase

M48oc INPUT MODULE 14) PGM/PEAK indicator DS2: Flashes green with normai program levels of vu or greater at the insert point and changes t0 red 4 ( peak levels of +22 dBm, indicating an overload condition 15) AuX Jevel control R9o; Controls the Ievel to the AuX mi x bus , 16 ) hIGH FREQUENCY section BoosT/cut control R29: Continously vari- able from -15 dB to +15 dB Sets the gain Or loss 0i the high frequency content of the program material with reterence to the norninal Ievel 17) MId FREQUENCY scction, poOST/cut control R54: Continously vari- able from -15 dB to +15 dB Sets the gain or loss of the mid frequency content of the program material with referencc to the nominal level 18 ) Low FREQUENCY section Boost/cut controi R28 : Continously vari- able from ~15 dB t0 +15 dB Sets the gain Or the loss of low frequency content of the program material with reference Lo the nominal level 19) EQUACIZER INSERT INDICATOR DSI : shows thal the equalizer i5 in the circuit. 20) PAN control R8O to RB3 : Alows and M2 crossfade to be made between Mi 21 ) M2 ASSI GN switch Sw1o: When depressed the channel output signal is fed via summing resistors Lo the external M2 mix bus 6-2

WBS M480C 13 OFF 48V OUT PAD SENS MIC Ling PEAK IPGM 15 PRE PSL AUX 16 46 32 KHz 18 19 6 PAN 20 M1 M2 12 ISSue DATE RevisiOn WBS WARO-BECK SYSTEN DRN "/~'jP ENC MPw CKD li4 APP SCALE M48oc INPUT MODULe

M4BOC INPUT MODULE 14) PGM/PEAK indicator DSZ: Flashes green with norma program levels vu greater the insert point and changes red peak levels +22 dBm, indicating an overload condition. 15) AuX level control R9o: Controls the Ievel the AuX mix bus 16) HIGH FREQUENCY section BoosT/cut control R29: Continously vari= able from -15 dB dB . Sets the gain loss the high frequency content the program material with reterence the OIn nal evei 17) MId FREQUENCY section, BoOST/cut control R54: Continously vari- able from -15 dB +15 dB Sets the gain loss the mid frequency content the program material with referencc the nominal Tevel 18 ) Low FREQUENCY section BooST/cut control R28 ; Continously vari- able from dB +15 dB Sets the gain the Toss low frequency content the program material with reterence the nominal level 19) EQUALIZER INSERT INDICATOR DSI the circuit stows thal Lhe equal izer 20) PAN control RUO and M2 RB3 : Alows crossfade be made between 21 ) M2 ASSI GN switch Sw1o: When depressed the channel output signal fed via summing resistor5 (he externa M2 mix bus 6-2

M480C INPUT MODULE PHANTOM POWER switch SwWI Selects +48 volts phantom power the microphone input Tor condenser microphone applications_ MIc PAD switch Sw3 : Inserts microphone signa path when depressed. dB loss Pad Tnto the MIC/LINE SELECTOR swilch SW4: Allows the choice ther the microphone Iine inputs be connected the preamplifier. INPUT SELECTOR switch SW2: Selects the signal source from either input PRE/POST AuX swilch SW7: Alows the pick-up point for the AuX signal be either ahead (PRE after (PoST ) the channel fader AuX switch Swin: When depre essed the Signa resis tors the external AuX mix bus fed via Sume ing MID FREQUENCY section FREQUENCY

control R47/R52: Continously variable from 0.4 to 6 kHz . The calibration refers [0 the center frequency of the bel l-shaped (peaking) equalizing curve. 8 ) Mid FREQUENCY section, 0 switch Sw6 : Selects the 0-factor OT the band pass filter t0 either 1.5 (Low) Or (HIGH) 9) EQUAL IZER INSERT switch SW5: When depressed, this switch in- serts the EQUAL IZER section into the signal path and activates the associaled LED indicator. When released, the unequalized input signal is switched directly t0 the output amplifier, by- passing the equalizer . 10) PAN switch Sw8 : When depressed, enables PAN control R8o [0 R83, 11 ) CUE switch SW12: When depressed, the signal originating ahcad of the fader is fed via summing resistors to the external CUE/SOLO mix Dus . 12) Mi ASSIGN switch Sw9: When depressed, the channel output signal is fed via summing resistors to the external MI mix bus . 13) SENSiTiViTY control R25: Provides continously adjustable gain range of 30 dB for all input sources sclected. 6-1

WAAO-BeCK System8 LTD OPERATIONAL

control R47/R52: Continously var able from 0.4 kHz The calibration refers thc center frequency the bell-shaped peaking) equalizing curve: MID FREQUENCY section, switch Sw6 : Selects the 0-factor band pass filter either (Low) (HIGH ) the EQUAL IZER INSERT switch SW5: When depressed this switch in- serts the EQUALIZER section into the signa path and activatcs the associated LED indicator When released, the unequalized iput signal switched directly thc output aMp lifier, by- passing the equa zer .

10) PAN switch Sw8 : When depressed, enables PAN control R8O R83 11 ) CUE switch SW12: When depressed the signal originating ahead the fader fed via summing resistors the externa CUE/SOLO mix bus 12) MI ASSIGN switch Sw9 : When depressed, the channel output signa fed via summing resistors the external MI mix bus 13) SENSITIVITY control R25 : Provides continously adjustable gain range dB for all input sources sclected.

6-1

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