M497D — Dual Master Module

8-109 AMPLIFIER SERIES

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Noise: -108 dBm EIN from 20 Hz to 20 kHz.

Source Impedance: 600 ohms or less, balanced or unbalanced.

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8-109 AMPLIFIER SERIES

Output Level : +30 dBm max imum.

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M49ZDUAL MASTER MQDULE The M49TD accommodates two separate signal channels. It is designed t0 receive the mixed feeds from the left and right mixer buscs of console_ The two sig- nals arc independently processed and amplified to standard line levels The outputs of the M497D supply the main program outputs of the console system Both channels operate similar manner. The following description refers specifically to the LEFT channcl.

66 ohm resistive dividing network; inscrted between the 8-109E and the two module outputs at pins 12/N and 13/P_ Each of the two outputs has maximum drive capability +24 dBm into bridging load_ scparate MONITOR output is provid- designed feed the M495 Stereo Monitor Module well to drive standard VU meter. Right_Chanael ad Mono_Output The signal originating from the external mixing network cnters thc module pins and is applicd to the summing current nodes of ZI and 22 The RIGHT channel of the M497D oper- ates manner similar the left channel as described above.

For the MONO output; both channels are combined and appear at pins [/M Thc signal level of this output 15 such that, when connected The summing input of sccond M497D it will produce output of dBm_ with the left right channel of the first unit operating at +8 dBm through Z3 with their associated components, provide an actively balanc- ed input as well balanced output: Thc output operates at nominal level of 0 dBm and appcars at pins 6/F_ Insert balanced INSERT point is provided between pins 6/F and 8 /J_ permitting the insertion 0f external cqualizer filter compressor_ cither using M499 Insert Switcher or by dircct wiri- Power_Supply_Decoupling An active power 'congcwia g o4PQy dccouplio8 network through provides isolation betwcen the module and the +/-25 volt supply rails.

Transis- tors Q3 and 06 monitor [he supply current: In the event of excessive power supply demands such as from compon- ent failure Or amplifier overdrive, the current flowing through Q and Q4 will bc limited Lerel_Adiustment From thc INSERT point_ the signal returned to the module at pins 8/J and fed the 8-109E output amplifier via attenuator network: R42 lcvcl trim potentiometer permitting adjust- ment the module output Icvel.

small hole thc module front panel allows access to the trim control. Qutline The 8-109E output amplifier operates wIth gain of 29 dB, It recovers thc loss of thc input network and provides additional gain producc nominal line level of +8 dBm the output of the module Input

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8-109A

PART DESCRIPTI ON MFG MFG PART NUMBER

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PART DESCRIPT ION MFG MFG PART NUMBER

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M49ZD DUAL MASTER MODULE PART DESCRLPTION MEG MFG PARTNUMBER R41 R42 R43 R44 R45 Resistor 1/4W 546 Potentiometer Resistor [/4W 595 Potentiometer Resistor |/4W 59 Philips A/B Philips A/B Philips CR2S WBS 10-015 CR25 WBS 10-015 CR25 1 2 36K 36K 36K 36K R46 R47 R48 Rso R5[ R52 RS3 R54 RSS R56 R57 R58 R59 R60 R6 [ R62 R63 R64 R6s delete Resistor |/4W 59 ISK ISK 470K Philips CRZS R66 R67 R68 R69 R70 2K2 2KZ 3.3 3.3 5.3 R7I R72 R73 R74 R75 3.3 390 390 SOT SOT R76 R77 R78 R79 75 75 ZI To 26 Integrated Circuit National LM3OIAN WBS recommends thc use of replacement parts made by the specified manufacturers for continued optimum equipment pcrformance.

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M49D DUAL MASTERMQDULE PART DESCRIPIION MFG MFG PARTNUMBER 06 Transistor National PN3645 Resistor 1/4w 506 ISK 0 0 ISK 620 620 12K Trim Pot Resistor Trim Pot /4W 500 E Resistor /4w 506 620 620 8 830 a 0 # dclete Philips CR25 1 RS Ri R9 R 10 R 11 R12 R13 R14 RIS RI6 R/7 R18 R19 RzO Pihcr Philips Pihcr Philips PTIOV 2K CR2S PTIOV 2K CR2S R2I R22 R23 RZs R26 R27 R28 R3o R3I R33 R34 R35 R36 R33 R39 R40 3-2