Studer-928-Service-Manual-Section-3电路原理图.pdf

Professional Audio System Components Date printed: 29.11.01E1 CONTENTS 1Introduction.3 2MSC System.4 2.1Modular Sub-Cards (MSCs). .5 2.1.1Motherboard for 1 MS-Card .1.914.500.5 2.1.2Breadboarding Card .1.914.529.5 2.1.3Line Output Amplifier .1.914.501.6 2.1.4High-Level Input Amplifier .1.914.502/504.8 2.1.5Loudspeaker Amplifier .1.914.505.10 2.1.6Microphone Pre-Amplifiers .1.914.506/507.11 2.1.7VCA with Electronically Balanced Connections .1.914.515.13 2.1.8VCA with 1 or 3 Control Ports .1.914.518/528.15 2.1.9Limiter Voltage Processor .1.914.519.17 2.1.101900 Hz Signal Generator .1.914.520.19 2.1.11Call Decoder 20.60 Hz .1.914.521.20 2.1.12Call Decoder 1900 Hz .1.914.522.21 2.1.13Relay Sub-Cards .1.914.523/524/525/526 .22 2.1.140- Input Amplifier with PFL Facility .1.914.530.23 2.1.15High Level Input with PFL Facility .1.914.531.24 2.1.16Flip-flop Unit .1.914.532.25 2.1.1790 Filter .1.914.533.26 2.1.18Dual Vox Detector .1.914.534.28 2.1.19Microphone Amplifier with Limiter .1.914.539.29 2.1.20Dual Fader/VCA Control Voltage Interface .1.914.540 /541.31 2.2Euro-Cards. .32 2.2.1Motherboard for 4 MS-Cards .1.915.770.32 2.2.2Power Supply .1.915.100.33 2.2.3Audio Generator .1.915.200.35 2.2.4Monitor Amplifier and Switching Relays (Studio/CR) .1.915.304.37 2.2.5Distribution Amplifier .1.915.307/308.39 2.2.65 W Power Amplifier .1.915.410/415.41 2.2.740 W Power Amplifier .1.915.440/441.43 2.2.8Monitor Switching Relays .1.915.601/602.45 2.2.9Transistor-Driven Relays (7+2) .1.915.603.47 2.2.10Dual Limiter .1.915.700.49 2.2.11Telephone Hybrid .1.915.760/764.51 2.2.12Line Equalizer .1.915.776/777/779.53 2.2.13Dual Balancing Unit/Dual Line Amplifier .1.915.904.56 2.3Racks and Frames. .59 2.3.119” Mounting Frame for 3 Euro-Cards .1.918.100.59 2.3.219” Ventilation Unit/19” Blank Panels .1.918.119/0XX.61 2.3.319” Euro-Card Mounting Frames .1.918.318/319.62 2.3.419” Euro-Card Mounting Accessories. .63 RadioFans.CN 收音机爱 好者资料库 Professional Audio System Components Date printed: 29.11.01E3 1 INTRODUCTION The individual descriptions and application notes contained in this bro- chure are intended to acquaint designers and project engineers with the Studer Audio System Components. They allow to realize custom-tailored signal distribution, signal switching and amplifying systems to satisfy al- most any individual requirement. Euro-Cards (1.915.)The backbone of the system is the so-called Euro-card, a circuit board measuring 100 160 mm, which comes in a great variety of different cir- cuit configurations. Modular Sub-Cards (1.914.)Furthermore, there are the Modular Sub-Cards, small plug-in cards. Four of them can be accommodated on one Euro-size motherboard, allowing to make up a system which provides the ultimate in flexibility. Racks, Frames (1.918.)Matching 19” mounting frames and 19” sub-racks for Euro-cards with or without power supply are available as well as installation hardware. For prices please consult your local Studer distributor or contact: Studer Professional Audio GmbH Althardstrasse 30 CH-8105 Regensdorf Switzerland Phone: +41 44 870 75 11 Fax: +41 44 870 71 34 e-mail: salesstuder.ch We reserve the right to change the design and the performance specifica- tions of the products listed here as technical progress may warrant. RadioFans.CN 收音机爱 好者资料库 Professional Audio System Components E4Date printed: 29.11.01 2 MSC SYSTEM To provide highest possible flexibility for the designer of professional sound systems, Studer engineers have pursued a completely new concept. The Euro-card is a convenient circuit board as far as its size and its plug-in features are concerned. However, it often offers excess space for a par- ticular circuit. This has triggered the idea to utilize the Euro-card simply as a carrier (“motherboard”, order no. 1.915.770) for four smaller plug-in circuit boards, the “Modular Sub-Cards” (MSC). The 32 connections of the Euro-card are divided into 6 supply lines com- mon to the modular sub-cards, and 4 6 individual lines joining the plug- in sockets for each sub-card. The remaining 2 connections are used as separate bus lines, one of them leading to sub-cards 1 and 2, the other one to sub-cards 3 and 4, resulting in a total of 13 connections to each MSC. A small motherboard for only one MSC is available as well (order no. 1.914.500). A great variety of different circuits is available in form of MSCs, such as Balancing amplifiers Microphone pre-amplifiers Speaker amplifiers 0- input amplifiers Limiters Voltage controlled amplifiers (VCAs) Relay sub-cards High level input amplifiers Line output amplifiers 1900 Hz signal generator/decoder 90 filter, stereo/mono Flip-flop Breadboarding card (0.1”/2.54 mm grid) To meet the requirements of a system concept, a designer will be able to build individual circuits similar to working with a construction set: He ei- ther selects from the available circuits on Euro-cards or makes up his own Euro-card by simply arranging the most suitable combination of Modular Sub-Cards on the motherboard. Professional Audio System Components Date printed: 29.11.01E5 2.1 Modular Sub-Cards (MSCs) 2.1.1 Motherboard for 1 MS-Card1.914.500 If only one MS-card is used, this motherboard is helpful for both me- chanical and electrical interfacing. It consists of an aluminium mounting base (135 36 mm) and a small PCB with a connector for the MS-card; for wiring, this PCB contains solder terminals. Note:For installation of up to four MS-cards, there is a second, Euro-card for- mat motherboard available (1.915.770) that can be installed into an Euro- card rack. Please refer to chapter 2.2.1. Ordering InformationMotherboard for 1 MS-card1.914.500.xx 2.1.2 Breadboarding Card1.914.529 This experimental board is an empty plug-in PCB compatible with the MSC system. It offers a punched 0.1” grid (2.54 2.54 mm) for individ- ual component placement. Ordering Information:Breadboarding card1.914.529.xx Professional Audio System Components E6Date printed: 29.11.01 2.1.3 Line Output Amplifier1.914.501 Designed for operation at a nominal line level of +6 dBu (1.55 Vrms), this amplifier can handle levels of up to +24 dBu (12.3 Vrms), providing an ex- cellent overload margin without the risk of clipping. A unique circuit around the primary of the amplifiers output transformer ensures excellent frequency response performance throughout the audible range. Fine and coarse gain adjustment is provided which allows to accommodate input levels in the range from 22.+8 dBu for a nominal +6 dBu output. Professional Audio System Components Date printed: 29.11.01E7 Technical Specifications Input:Impedance 10 k, electronically balanced (transformerless) Overload point+24 dBu Output:Impedance< 50 , balanced and floating Minimum load200 Maximum level+24 dBu Gain2 dB.+28 dB; adjustment: coarse 0 or 15 dB/fine 2 dB.+13 dB Frequency response0.2 dB, 30 Hz.16 kHz THD< 0.01%, 30 Hz.16 kHz Equivalent input noise 10 k (transformer- or electronically balanced versions available; input with RF filter; 0- input selectable with jumpers) Common mode rejection 50 dB Overload point+24 dBu (12.3 Vrms) Output: Impedance33 (pin1), unbalanced Minimum load600 Maximum level+20 dBu (7.75 Vrms) Impedance3.3 k (pin2), unbalanced, for 0- operation Maximum gain1 dB Maximum attenuation30 dB Frequency response0.3 dB, 30 Hz.16 kHz THD 10 k, balanced and floating (with transformer) Nominal power output2 W into 15 Power output 25 mW.2.5 W into 15 , with 0 dBu input Distortion< 0.5% at 2 W 1 k, for microphones with an impedance of 200 or less. Max. input level2 dBu (615 mVrms); THD at 30 Hz: approx. 1% Common mode rejection 60 dB, unbalanced, to ground Output:Max. level +20 dBu (7.75 Vrms) Nominal level 0 dBu (0.775 Vrms) Impedance33 (pin1) 3.3 k (pin2; to a 0- amp.) Minimum load600 Max. gain71 dB (see level diagram) Frequency response 0.5 dB, 30 Hz.16 kHz THD< 0.3%, 30 Hz.16 kHz at 20 dB gain Noise figure, linear< 4.5 dB, input terminated with 200 Supply:15 V (11 mA idling) +48 V (1.914.506, only if phantom powering required) Dimensions:MS-card, 34 85 mm Ordering Information:Microphone pre-amplifier for dynamic microphones1.914.506.xx Microphone pre-amplifier for electret microphones1.914.507.xx Professional Audio System Components Date printed: 29.11.01E13 2.1.7 VCA with Electronically Balanced Connections1.914.515 In contrast to the VCA 1.914.518/528 (chapter 2.1.8), this assembly fea- tures an electronically balanced input and output. It is intended for use in balanced audio systems for a variety of applica- tions, especially when gain is to be controlled from a remote point. It will be useful in audio-video post-production work where suitable DC ramps can control cross-fades, voice-overs, etc. Its high overload margin and its exceptionally low noise and distortion performance make it the perfect choice for high-quality audio applications. By connecting the gain control terminals of a number of VCAs to a com- mon potentiometer or fader, several audio channels may thus be con- trolled simultaneously. Two control inputs provide VCA gain control from two different remote points Professional Audio System Components E14Date printed: 29.11.01 Technical Specifications Input: Impedance 10 k, electronically balanced Clipping point+24 dBu Output:Electronically balanced Recommended load 2 k Maximum level+24 dBu Frequency response0.5 dB, 30 Hz.15 kHz Gain/attenuation range+40.100 dB, with ext. control Control input: pin1; gain tracking0 V = unity gain; 1 dB/A; jumper 1-2 20 dB/V; jumper 2-3 10 dB/V; jumper 3-4 Control input: pin10; gain tracking10 dB/V THD 3 k Clipping point +20 dBu Output:Impedance 33 or 3.3 k, selectable Max. level+20 dBu Recommended load 2 k Frequency response0.5 dB, 30 Hz.16 kHz External gain control +40.90 dB (1.914.518.xx) +40.100 dB (1.914.528.xx) Gain/attenuation range (pot. meter)+40.60 dB / +10.70 dB / +10.90 dB (1.914.518.xx only, jumper- selectable) Gain tracking 10 dB/V THD< 0.1% Equivalent input noise102 dBu Supply:15 V (40 mA) Dimensions:MS-card, 34 85 mm Orderin