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Professional Audio System Components
CONTENTS
1 Introduction.................................................................................................................................................................................3
2 MSC System................................................................................................................................................................................4
2.1 Modular Sub-Cards (MSCs).............................................................................. .................................................................5
2.1.1 Motherboard for 1 MS-Card ....................................................................1.914.500................................................5
2.1.2 Breadboarding Card ..................................................................................1.914.529................................................5
2.1.3 Line Output Amplifier ..............................................................................1.914.501................................................6
2.1.4 High-Level Input Amplifier .....................................................................1.914.502/504 ........................................8
2.1.5 Loudspeaker Amplifier .............................................................................1.914.505..............................................10
2.1.6 Microphone Pre-Amplifiers .....................................................................1.914.506/507 ......................................11
2.1.7 VCA with Electronically Balanced Connections ....................................1.914.515..............................................13
2.1.8 VCA with 1 or 3 Control Ports ...............................................................1.914.518/528 ......................................15
2.1.9 Limiter Voltage Processor .......................................................................1.914.519..............................................17
2.1.10 1900 Hz Signal Generator .......................................................................1.914.520..............................................19
2.1.11 Call Decoder 20...60 Hz ..........................................................................1.914.521..............................................20
2.1.12 Call Decoder 1900 Hz .............................................................................1.914.522..............................................21
2.1.13 Relay Sub-Cards .......................................................................................1.914.523/524/525/526 ......................22
2.1.14 0- Input Amplifier with PFL Facility ...................................................1.914.530..............................................23
2.1.15 High Level Input with PFL Facility .........................................................1.914.531..............................................24
2.1.16 Flip-flop Unit ............................................................................................1.914.532..............................................25
2.1.17 90