M522B

5414-152/5414-1524 FILTER ASSEMBL JES The leif: channel section wil be described_ The rignl channe cperates an icentica manner and the mono channe makes ue tne left channe circuitry ony Mic Tre quency Stale Varianle Filter The Mid-Frequency state variable Tilter compriscs an inverting bufier amplitier UIA combining amplifier UIB arid Two low Pa;s ters made 4D U2A, U28 C6.C10 and the externa frequency controi R6 Tnc externl ectcr switch Sw2 affects the overal end [hereny contrclling V5 filter g2in The Mter input is applied P1-2 PI-1 and the Filter output appears The Mid-Frequency #2 stale variable filter made uD their asscialed components C17, Cz1 anc externa Cetermine the center resonant) frequency this filter 03, Ua and control High Frequency High Pass Filter USA buffers the high pass filter networt< from the external cut/poost, contro C26 C27 , R28 and external frequency contro RSA determine the corner requency the high pass ter USB butfers the ter frequency ceterminins components from the summing amplifier U3B the main equa zer assembly Low Frequency Low Pass Filter The low frequency sheiving network comprises external frequency control R5 R3O , C29 and C30 Buffer u6 isolates [he frequency determining components from the equalizers summing amplifier

ME228 /M522C EQUALIZER_MODULE: Note: Specifications are Dased on voltage levels of 600 cnm system unless otherwise speciiiec. Gain: Unity t/-0.25 dB = Frequency Response: F/-0.5 aB From 20 Az t0 20 KHz With the ecualizer inserted ena cui/boost controis in tne cetent positon Noise: -90 cBm apsolute (20 Hz I0 20 KHz) equalizer cut/boost controls in the cetent position Harmonic Distortion: Less [han 0.10 from 20 Hz :0 20 kHz 3: F20 cBm output level Or less. Less [han 0.0190 at kHz 2[ -20 aBm OUIpui Tevel Source Impedance: Less than 10 onms unbalanced . Input Impedance: Greater than 10k ohms palanced Input Level ~6dBm nominal +20 @Bm maximum. Output Impedance : Less than 50 ohms unbalanced. Load Impedance: 5k ohms or grealer. Output Level: 26 dBm nominal +20 @Bm maximum. Channel Separation: Greater than 60 dB = Phasing: The Jow numbered input terminal is In phase with [he output terminal with tne equal izing controls in the detent position Equalization Tracking: Within 0.5 @B _ Power Requirements: -/-25 volts dc (M5228 55 ma , (M522C 80 ma ) Ambient Temperature: Dimensions: I0 60 degrees Celsius. 60" wide 7.00" high 6.50" deep (41 Mm 178 Mm 165 Mm/ Weight: M5228 M522C IP Ib 0z (0.564 kg nel. 0z (0.624 k9 nela 1-

GENERAL 11522p M5ZZC ECUALIZER MODLLE: Tne M5228 MEZZC Mono and Stereo Ecualizers operate in conjunction with the M520 and M5zi scries OT Input Voclles The equalization Tunctons divicc the audio {pectrum into four areas or banids There is the Low Frequency section wnicn coniro = equalization cver thc frequency rance Trom 20 Hz [0 typicaily 200 Hz. Tne eclalizaticn charac eristic is thal 0i spelving with baost and atienuation range Ot 7-15 cB Tne Mid-Frequency #| secticn controls equalization over the 100 Hz t0 1 .5 KHz range enc nas Eel | shaped ecualization cheracteristic coost anc Cu" range cf 15 dB 15 provided along W i ch Lwo "0" settings High ard Low Thc Kigh "0" has nominal va Ue 0r anc the Low "Q" romina value 0i The Mid-Frequency 12 section1 controls ecualization over the 800 Hz Lc) kHz range and has bel | shaped equalization characteristic. boost/cut control along with Hi gh/Low "0" switch identical t0 Mid-Frequency #1 AbGve Are provided The Hign-Frecuency section with its shel ving :ype ecualization char= acleristic covers the frequency range 0f 3.5 kHz Lu 15 khz _ boost and clt rangc 0t 15 db is provided_ An insertion switch 15 provided long with show wnen the mtodule is processing the audio . red LED incicator t0 The ecualizers are Fackayed in single module size of 1.6" wice 7.0" high 6.5" deep ana plug into the appropriate space above m520 cr M521 Input Module in the "sT" series of Sterco Television consoles The M5228 M522C mocules are powered fromn the +/-25 valt power supply system 0t the mi xins console. 2-1

CIRcUII DESCRIPT ION M522E MSZZC EQUALLZER_MODULE: Tne ef: channel 0f the M522C Stereo Equalizer wi be described This description also apo/ ies to the M5228 Mono Equalizer _ Lreut An actively balancec differential input is provided by UIA and its associated components The audio input is apolied to pins and 5 of the module cornector The output of UIA feeds the equalizing scmming erplifiers 42 and u3 and the normally closed contacts of the EQ insert switch SWIA, through coup| ing capacitor C5 Mid-Freguency Equalizer The cutout from input buifer UIA feeds the Mid-Frequency #1 RuMM ing amplifier through R16 and the cut/boost control R2A . RZA bridges between the inpul and cutput of summing amplifier U2B . The arm of RZA feeds an in Or out of phase signal to the state variable filter on the 5A14-152 assembly SW2 Sels the 0 of the Mid-Frequency #1 state variable filter Lo (Iow) or (high) The center frequency 0f the Mid-Frequency #1 state variable filter is determined by the setting of R6, which covers the frequency range 0f 100 Hz t0 1500 Hz _ The stale variable filter output is fed back into summing amplifier 428 via R17 This feeaback signal adds. or subtracts from the maln channel signal in Proporation to its magnitude and pPhase relation- ship. The Mid-Frequency #2 sectjon of the equalizer covering the frequency range of 800 Hz Lo 8000 Hz operates in similar fashion t0 that cutlined above for the. Mid-Frequency #1 section Summ ing amplifier UZA , along with cut/boost control R3A and frea- uency controi R7 determine the equalization parameters of the Mid- Frequency #2 section. Sw3 is the high/tow selector switcn for this section

Curcu DescRiptiON "E3EC ECUALIZEZ MQQULZ: Hign Freclencv Equalize: Summing amolifier UZP long ith cut/boost control R4A and hign pass "ilter lecetec cn thc 5A1L-152 assembIy form tne high Trequency 57= vinc ecualizer Sec:icn . The coracr Treqguency Tor the hisn Trec - Lenc/ enci ving cjarzcte-is:ic is continuously variaolc Trom 3 kl; T0 15 <h2 uzz Comjines tte ma: n sign2l path (through R24 ) and the feedbac signal through 325 0 2fiec: the frequency- response of (ne equal- izer aucid signel in the nign Trequency portion of the the aucio Gdectrum Tne corjer Trequency is 'varied by the adjusiment of REA Low Frecuency Equalizer 4ZA comjines Or sums the low {requency signal compunenis ircm the low Treclency shelving sectior of the equalizer . Cut/cocst" control RIA feeds control signal either in phase or ou of phase with the main signal path to Tow phase active filter on the SA1--122 assemuly. The corner frecuency of the low Pass Filter may be varied from JC Hz {0 ZCO Hz by the setting of frequency control RSA . Tne low pass filter output is fec back t0 U3A through surriming resistor RJO This return signal wili either add Or subtract from the main channel signal (herejy ffecting cut ar boost equalizing characteristic to the low frequency portion of the audio spectrum. Quteut Tne equalizer outpul is coupled through Cz0 t0 the normally open contac: 01 EC insert switch SWIA LI and R37 form Tow Pass filter wIth any external stray capacitance. This helps isolate the ampli - fiers from_ capacitive loads , thereby mainlaining stabil ity in the prese

M5228 MONO EQUAL I ZER MODUL E

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/>1 522 B ""OND EQUAL IZER MODUL E

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M5228 MonO ECUALIZER MODLLE PART DESCRIPT ION MFG MFG PART NUMBER C1 C2 c: Ci C5 Capacitor IC LF/25 10 LF /{25 150 pF 22 pF 100 UF/20 Keme: T390c106M02545 Philips: 2222-638-70151 2222-638-10229 TAPCiOomZO #TT C6 C7 C8 c9 Cio 220 pF 22 pF 6d uF/1o iCO pF 22 PF Philips 2222-630-03221 2222-638-10229 13900686M01OAS 2222-638 58101 '2222-638-1.0229 Keme[ Prilips CII C12 C13 CIA C15 66 uF/10 330 PF 22 pF 150 uF/10 Tco pF Kemet Philips T3900686moiOAS 2222-630-03331 2222-638-10229 TAPCiSOmIO 2222-638-58101 tt Philips Ci6 C17 CIB C19 C20 100 DF 100 pF 10 uF/25 66 uF/10 68 uF/10 2222-638-58101 2222-638-58101 T390Ci06M025A5 T390d686M01OAS Kerriet C21 To C4o C"| CL2 CL3 C4h C45 delete 0.1 uF/100 22 uF/25 22 UF/25 V 22 uF /25 22 uF/25 V Sprague Philips ICIOXZRIOLMOSOB 03016229 C46 CL7 C4B C49 cso C5i 22 uF/25 22 uF/25 V 10 uF/25 V 10 uF/25 0.1 uF/100 0.1 uF/100 Kemet T390C106MO25A5 Sprague 1COX7RIO4MOSOB C52 To C55 C56 delete 1500 PF Aselco ca9z-MC-100-153M 6 =

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