M462C

SA44-109 UNIVERSAL AMPL IF IER ASSEMBL Y 011 and 012 are current sense transistors which control the output capabilities of the decoupler circuit on the module motherboard. R3I and R38 sense the +/ - supply rail currents and determine when 011 and 012 beg in to conduct. J~ " e The collectors of 011 and 012 connect to the base drive circuits of the motherboard decouplers . The conduction of 011 or 012, as result of excessive amplifier currents, reduces the voltage output from the motherboard decoup ler (and that supplied to the SAIA-109 amplifier) By this means the power dissipation of the SA14-109 amplifier is Iimited under overload conditions. O^ ) uni boars'ed 941 [5s '| 6^ ! 2 ' 9306!6d 6n1| "ufienol 'Oo) VtF+Ut270} uan] Jino T 2 4onodb? 451|8) Fas( TTO)(fk*1') 7 To "oiloist 9479 n` Vn1 6uze? 493n6 6 ( 2 | 03e} Ionp;? 4 ) Ce 00 | | Joris" JOB,<" ,^ 2016n97 Toqfiu bajne Ednu ~0 TKn ~18 2 5 bosilit ; 2 ; nig 20oM1291/996 bojo6/odru 10 ' ['4+2 U (otM JiiC) i 6npia ZA 67 30lnq '191*i/9mg |5f101: | 574Jo Nf 1o 2122no] 761jn0? do.3 V I ~ ;' < 3| bei i; ';{ 270j2i2n6*)! 9147J2/4 40 ) Coijsaui 39/}i/0mna 8 ~av 7 ivoie XL 1^( ' # Uqiuo J01 6edi3-b ed #|6 , Coi].: F14, In(08 Toqqu 31 i; `1 70 4101?i40878 30fcemi |0mo) 9 |T (0 bne 10 ~vefkina dovs| 01 bai '!3 #0 75 ; ' j 4ms 4 " To 78 oG 6np 1> WaiJo #r' o99yob 80 PL %''6 'o 10 J 'XTL) pn{b i "8 , (on; F0 , didw 70/2;2416 6n;?e fsb a 7 '] 7'0s €r 3 ~@uoncf bslqu03 79i1i'9re ~8qG0 Pm) {n;7| {Uao 84 | "'" | 1 > "ir fG J5 g ^4 690'46 bae i{9 T | Aof }(1 0i]e}t? 2Rn 140" 70ijsj Tdri9zes nia 10 1 6 3 1640'10 6c . | 42 Aaiiions Is7*0 | 0. 1 {1mn/imiz LQUQuor0 Xygue._2ke9 ~ T; 1o I:*6 201.' 6 9 '€ eri 6#G4E 210 | %lGa< 6n / CS ort 31"} "a , JJ '929 TJ 23 Ci A vdl bolquozeb 2 " E" Joi-entn) 7 |0*?30 06 ; 27o1'i4M6 16noi ) B i8q0 941 29vi , 01 |"v 01- * ~AT 2r0v 0) CU {OE 3-2

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M462C STEREO EQUALIZER MODULE circuit description details wili pertain the Left Channel . The right channel circuitry operates similar manner TtfT [ naisogoid Loeul The left channel input appears pins 2 of the module connec - tor and the right channel input connector pins Input shield connections may be made pins and Gonlibnos UIB converts the Icft channel input signal from balanced an unbalanced mode , as weli as acting a5 buffer the equalizing circuitry 6nj SV The output from UIB coupled through bypass switch SWIA and low frequency cut/boost control RIA .

also feeds the combining amplifier U2B _ Ur (; |~ 7^n Lin 901 171o7 ; 1Va0 'ineiz Combining Amplifiers 09c00781.77 3,76176v 316/2 9078?; Jnsupst Amplifiers U2B , UZA and U3A are combining mixing amplifiers which take the main channcl audio signai and add the outputs from the equalizing state variable filters Miaa The equalizing characteristics divides the audio spectrumn into three bands.

The Low frequency covering frequencies from Hz L0O Hz These frequency components are mixed by U2B . Lialuo JUlo"r ASU oine UZA combines audio components over the Mid frequency range from 400 Hz kHz The high frequency por ion the audio spectrum over the range 1.6 kHz kHz mixed by U3A _ 309JC9 ' U3B forms an isolation amplifier the output which coupled through C16 insertion switch SWIA_ Idb n # 4 Jnsups Low Frequency Equalizer 0 16 Z7o' s2 loninc- 2n1nsz No) } Inenoz The cut/boost control RIA bridges between the input and output mixing amplifier U2B 'Laiuo The arm control RIA feeds portion the audio signal state variable filter composed U4B U4A and USB C19 and C21 along with sections and frequency control Rl , determine the resonant frequency the filter

SA14- I09 UNI VERSAL AMPL I F IER ASSEM BL Y

PART DESCRI P TIO N " CO "' GPART NUMBER 0' T r a n s; slor Na t ion a l PN 3569 05 " " PN3645 0' " " PN356 9 0' " " T N21 02 OS " " T N403 6

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SA14-109 UNIVERSAL AMPLIFIER ASSEMBLY PART DESCRIPION MFG MEG PART NUMBER Capacitor uF/10 33 uF/10 22 pF pF 0.1 uF/100 Kemet T390D 336M01OAS C2 Philips 2222-638-58229 Sprague 1COXZRIO4MOSOB uF/100 8 uF/25 pF 68 pF pF 22 pF 28 uF / 25 pF 10 uF/35 10 pF JiP 426ETF 22 5 4 2222-638 52689 8/ 4 2222 638-58229 p:A 2222 638 52689 0;?

8 Philips C1 8 C14 C15 2222 638-58229 426ETF22 55S 2222-638-10159 <44 T390D106M02545 K5n 2222- 638-10159 3fA Kemet Philips C16 10 uF/ 35 Kemet C17 22uF/25 Philips uF/25 8 220 uF/10 Kemet 220 uF/10 Lz Choke 100 uh10% RL Components Pz Connector Pin Bergstik Berg Resistor 1/4w 5% 47K Philips 47K 1 6K2 6k2 T390D106M035AS JiX 426ETF22 5SA 659 T390F 227M010AS OEa WBS 13-001 iLt Se4 Xcc 4,3 ZEA 65645-106 J6 F FcT 829 O44 6K2 7K5 7K5 5k6 5k6 RG R8 R9 R1O 719 eaceh9 27}&i20167 | Jpoiw

SA14-109 UNIVERSAL AMPLIFIER ASSEMBLY Ae SAIA-1094 "' 46 '1 6 TAAc| AII parts as per SA1L-109 except 25 noted below . eaelha YenoijeM 7,a6Mc; Voi[4ARE 1249 701?120197T 4C 20 23 MFG PART NUMBER 6' 80 PART