M461 — Input Module Functional

4-110 PREAMP /HIGH PAsS FILTER The 4-110 preamp]ifier is printed circuit board designed to be used as an interna] component 0 f the WBS M460 and M461 input modu ] e series Preceding the 4-110 is input transformer T1 The secondary Winding 0 f T] is connected to termina ] s E1 and E2 _ Q1 thru Q5 form non-inverting operationa ] amp] ifier us ing discrete components The feedback resistance defining the ga i n 0 f the amp]ifier consists 0 f R6 R7 _ R8 as we71 as the SENSITIVITY potentiometer externa ] t0 the 4-110 and acces- s ib]e at the front pane 1 0 f the M460 or M461 respectively continuous range 0 f 30 dB is provided with the SENSITIVIty potentiometer .

The output 0 f the preamp] ifier is connected to an active High- Pas s filter with ro]]-off 0 f 12 dB/octave The filter compo - nents consist 0 f 21 C8 , C9 , C]0 , R13 R14 as we]1 a5 the ganged ro]I-0ff po tentiometer marked HP accessib]e at the front pane1 0 f the M460 or M461 The filter can be de-acti- vated by rotating the HP potentiometer fully counter-clockwise_ The HP potentiometer is ca]ibrated to achieve continuousIy variab]e dB ro]]-0ff point from 25 Hz t0 250 Hz A +21 volts supply Vo ]tage is derived interna]ly within the M460/M461 module and appiied to Pins E4 and Eg 0 f the 4-110 4-110-]-1

M461 NQISE GATE METER MODULE Metering Stereo Tie: Meter facilities provided for operation with M466 Compressor / Limiter Phasing : Low number termina ] s 0 f input and output are in phase _ Power Requirements: +25 volts dc , 135 ma maximum . Ambient Temperature: to 600 Celsius Dimensions 1 6" wide X 7" high X 6 .5" deep (41 mm X 178 mm X 165 mm ) 1-2

M46 1 [NPUT MODULE PHA SE Reversa] The signa] is returned to the modu le via pins 13 and and routed through the PHA SE REVERSAL switch SW2 to the CHANNEL ON switch SW3 . SOLO/ CUE The bridg ing take-off for the SOL 0/ CUE output is picked up between SW2 and SW3 . CHA NNEL ON Swi tch The CHA NNEL ON Switch SW3 controls al1 outputs of the modu le with the exception of the SOLO/ CUE output.

Fader Fo] Iow ing SW3 . the s igna | is brought out of the modu le via pins 12 and N for insertion of balanced fader The output of the fader is returned to the modu le on pins 11 and M. The input s i de of the fader also serves as pick-up point for the PRE-FADE REVERBERATION SEND (RS) and the PRE FADE FOLDBACK (FB) channe Is via switches Sw1O and SW3 respectively.

4-109 Booster Amplifier The 4- 109 booster amp] ifier operates with gain of 15 dB and recovers the loss incurred when the fader is placed in its nom ina] 15 dB "in hand" position. PAN and Main Outputs The output s igna] of the 4-109 amp Ii fier is used to feed both left and right main outputs via the PAN switch SWI1 and PAN contro] R40 through R43 It also provides the feed for the POST_ FADE RS and Post-FADE FB channe I s via SW tches SWIO and SWg _ 2 -2

4-109 AMPLIFIER SERIES 4-109 PART DESCRIPTIon MFG MFG PART NUMBER Capacitor 1000 pF 33 uF/10 V Aselco Kemet cQ92-MC-102m T3900336K010AS 8 Gs C6 c8 C9 C10 C1] C12 C13 C14 C15 uF/35 V 0.0F5 uF T390B705K035AS CQ92-MC- 153M Aselco Delete 1000 pF Aselco cq92-MC-102M 220 uF/10 V Delete Kemet T390F227K010AS uF/35 V .015 uF 1000_ pF Kemet Aselco T390B105K035AS cQ92-MC-153M CQ92-MC-102M 220 uF/10 V Kemet T390F227K010AS C16 C17 C18 C19 47 pF Philips 2222-638-70479 2 .7 pF 2222-638-03278 CRI CR2 CR3 CR4 Diode Fa irchild 1N4148 LI L2 Choke 100 uh Aselco S 189-2.76 Transistor Nationa 7 PN3569 2N4037 2nz6oz PN3569 2 3 8 6 8 8 2N4037 PN3645 2N2102 4-109-2-1

4-109 AMPLIFIER SERIES 4-10.9 PART DESCRIPTIOn MFG MFG PART NUMBER R36 R37 R38 R39 R40 Resistor hW 5 % Resistor YW 5 5 aw 5 % XW 5 % 270 15 270 15 4K7 Phi]ips R41 R42 R43 R44 R45 470 15k 47K 1K 820 R46 R47 R48 R49 De Iete Delete 100 100 21 Integrated Circuit Fairchild 739PC 4-1094 A11 parts a $ per 4-109 except a $ noted be ]ow PART DESCRIPTIon MFG MFG PART NUMBER C1 C6 Capacitor (Deleted ) 4700 pF Aselco CQ92-MC-472M R3 R4 R5 R6 R7 Resistor (Deleted) AW5% 30k (Deleted ) XW 5 % 18k 470 Philips R8 RI1 R12 470 33K 620k 4-109-2-3

M46 1 NPUT MODULE PART DESCR PTION MFG MFG PART NUMBER RSS R56 R57 R58 R59 delete) Resistor #w 5% 470K (delete) delete delete) Phi lips R6o Resistor #w 5% IK Phi ]ips SWI SW2 SW3 SWL SW5 Switch Grayhi ]1 WBS 11-012 Schadow WBS 11-002 clare-Pendar SB 2310 delete) Switch Schadow WBS 11-002 SW6 Sw7 SW8 Sw9 SW]O WBS 1-006 WBS 1-002 WBS 11-006 WBS I1- 005 WBS 11-005 SWI1 SW12 SW13 WBS 11-002 WBS 11-004 (part of R52 , 53, 54) 3-3