Symetrix 425_ug 电路图.pdf

《Symetrix 425_ug 电路图.pdf》由会员分享，可在线阅读，更多相关《Symetrix 425_ug 电路图.pdf（59页珍藏版）》请在收音机爱好者资料库上搜索。

1、? ? ? ? ? ? Revision 2.0, 10/29/93 Part number: 530201 Subject to change at our whim, and without notice. Copyright 19921993 by Symetrix Inc. All rights Reserved. Batteries not included. Void where taxed or prohibited. Ground aint ground! Owners Manual Signal Processing at its Best! RadioFans.CN 收音机

2、爱 好者资料库 Table of Contents 1. Introduction.1-1 1.1 About this manual.1-1 1.2 Operator Safety Summary.1-2 1.2.1 Equipment Markings.1-2 1.2.2. Terms .1-2 1.3. Other Safety Information .1-3 2. Dynamics Processing Tutorial and Functional Basics.2-1 2.1 Dynamics Processing Basics.2-1 2.1.1 Compressors and

3、 Limiters.2-1 2.1.2 Expanders and Gates.2-2 2.1.3 Ratio.2-2 2.1.4 Gain vs Output .2-2 2.1.5 Attack Time.2-2 2.1.6 Release Time .2-3 2.1.7 Threshold Setting .2-3 2.1.8 Interpreting the Displays.2-3 2.2 Using the Sidechain.2-3 3.Technical Tutorial.3-1 3.1. Matching Levels vs Matching Impedances.3-1 3.

4、2. Signal Levels.3-2 3.3. I/O Impedances.3-2 3.4. Polarity Convention .3-2 3.5. Input and Output Connections.3-3 4.Front Panel Overview.4-1 5.Rear Panel Overview.5-1 6. Fast First Time Setup .6-1 6.1 Connections .6-1 6.2 Settings .6-1 6.3 Initial Setup.6-2 6.4 Refining Your Settings.6-2 6.5 Stereo C

5、oupling.6-2 7. Using the 425.7-1 7.1 Block Diagram.7-1 7.2 Installation.7-1 7.3 The 425 as a Compressor.7-1 7.4 The 425 as a Ducker.7-2 7.5 The 425 as a Limiter.7-2 7.6 The 425 as an Expander.7-3 7.7 Using the Expander and Compressor Simultaneously .7-3 i RadioFans.CN 收音机爱 好者资料库 8.Applications.8-1 8

6、.1 Vocal Level Smoothing.8-1 8.2 Removing Noise from Vocal Tracks.8-1 8.3 Constant Level Paging .8-1 8.4 Paging with Ducking.8-2 8.5 Stage Monitors .8-2 8.6 Keyed Bass.8-3 8.7 Sibilance Control .8-3 9.Troubleshooting Chart.9-1 10. 425 Dual Compressor Limiter Limited Warranty.10-1 11. Repair Informat

7、ion.11-1 11.1. Return Authorization.11-1 11.2. In-Warranty Repairs.11-1 11.3. Out-of-Warranty Repairs.11-1 12. Specifications.12-1 13. PCB Layouts and Schematics.13-1 13.1 Troubleshooting Hints.13-1 13.2 Additional Reading .13-1 Appendix A. Architects and Engineers Specification .A-1 Appendix B. Dis

8、assembly Instructions .B-1 ii RadioFans.CN 收音机爱 好者资料库 IN +10 GAIN (dB) +20 0 BYPASS BYPASS +12.5+5+15 +5 2 RATIO (X:1) -10 10SLOW1 -2.51.32.5 THRESHOLD (dBu)THRESHOLD (dBu) -10 FAST BYPASS-40 SLOW -25 +10 -20 DUALSTEREO STEREO LINKTHRESHOLD (dBu) BYPASS+5 DUAL MONO -5 -30 RELEASE FAST IN GAIN (dB) +

9、10 +20 BYPASS0 BYPASS +12.5+5+15 +5 2 RATIO (X:1) 10-10 1SLOW -2.51.32.5 THRESHOLD (dBu) -10 THRESHOLD (dBu) BYPASSFASTSLOW-40 +10 -25 -20 THRESHOLD (dBu) BYPASS+5 -5 -30 RELEASE FAST RELEASERELEASE OUT 0VU CLIP-10 -20 -3 LIMIT-6 -9 -12 -2 COMPRESSOR -4 -6 -10 -12 -8 -25 -15 -6 -12 -2 -18 EXPANDEROU

10、T 0VU CLIP-20 -3 LIMIT-10 -6 -9 -12 -2 COMPRESSOR -8 -6 -10 -12 -25 -15 -2 -6 -12 -18 EXPANDER -4 1. Introduction The Symetrix 425 is a dual channel compressor/limiter/expander. The two channels may be operated in dual-mono mode, or in stereo mode. In stereo mode, both channels receive identical con

11、trol signals, which minimizes image shifts caused by unequal gains in the two channels. At Symetrix, we feel that the 425 represents the distillation of our 15 years of signal processing experience into a product that is at once versatile and easy to use without having important controls removed in

12、the interest of simplicity. The 425 is unique because its processor sections are always in-line. There is no selector switch to select between expander, compressor, or limiter. Now you can expand the low-level parts of a signal to improve its signal-to-noise ratio, then apply compression to add punc

13、h and density and still have the security of a peak limiter for overload protection. We call this approach to total level control IDP or Integrated Dynamics Processing. IDP also means powerful, streamlined controls that make the 425 easy to learn and quick to set up, even with three types of process

14、ing in one rack space. Each section has the controls that you need to respond to any audio situation fast. Individual LED meters show you whats going on inside each section. The 425 is Listed by Underwriters Laboratories Inc. (UL). Samples of this product have been evaluated by UL and meet the appli

15、cable UL Standards for Safety. In the final analysis, Integrated Dynamics Processing means clean, quiet sound that meets professional demands in any situation. High-quality components and a minimalist signal path make the 425 exceptionally transparent. 1.1 About this manual We recommend that you rea

16、d this manual from cover to cover. Somewhere between the confines of the two covers you should find the answers to most (98%) of your questions, both technical as well as musical. If youre in a hurry (like most of us), or if you really dont believe that someone could write a decent owners manual tha

17、t you can read and understand, then do us both a favor and read section 6, Fast First Time Setup. This section will help you get connected, tell you what the knobs do, and send you on your way. This manual contains the following sections: Chapter 1. Introduction: introduces the 425 and this manual.

18、Chapter 2. Using the 425: describes how to use the 425. Covers installation, signal levels, input and output impedances, and physical features. Chapter 3. Technical Tutorial: a basic and not-so-basic discussion of signal levels, input and output impedances and connection polarity. Chapter 4. Front P

19、anel Overview: a brief look at the controls and switches located on the front panel of the 425. Chapter 5. Rear Panel Overview: a brief look at the rear panel of the 425. Chapter 6. Fast First Time Setup: is the setion to read if you cant wait. Rev 2.0, 10/29/93 1-1 Chapter 7. Using the 425: describ

20、es the use of the 425 in detail. Chapter 8. Applications: gives some hints for using the 425 in a variety of situations and provides a short introduction to dynamics processing. Chapter 9. Troubleshooting: tells what to do when the 425 doesnt work. Chapter 10. Limited Warranty: describes the 425s li

21、mited warranty. Chapter 11. Service Information: tells how to get your 425 repaired, how to obtain parts, and how to contact the factory. Chapter 12. Specifications: lists the technical specifications of the 425s performance. Chapter 13. Schematics: contains the printed circuit board layout(s) and s

22、chematic diagrams. Appendix A. Appendix A: contains the Architects and Engineers specifications. Appendix B. Appendix B: contains disassembly instructions. 1.2 Operator Safety Summary The information in this summary is intended for persons who operate the equipment as well as repair personnel. Speci

23、fic warnings and cautions are found throughout this manual wherever they may apply; they do not appear in this summary. The notational conventions used in this manual and on the equipment itself are described in the following paragraphs. 1.2.1 Equipment Markings Sadresser a un reparateur comptent. I

24、l ne se trouve a linterieur aucune piece pourvant entre repare lusager. No user serviceable parts inside. Refer servicing to qualified service personnel. NE PAS OUVRIR RISQUE DE CHOC ELECTRIQUE ATTENTION: CAUTION DO NOT OPEN RISK OF ELECTRIC SHOCK The lightning flash with arowhead symbol within an e

25、quilateral triangle is intended to alert the user of the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user o

26、f the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance (i.e. this manual). Caution To prevent electric shock, do not use the polarized plug supplied with this appliance with any extension cord, receptacle, or other outlet unless th

27、e blades can be fully inserted to prevent blade exposure. Rev 2.0, 10/29/93 1-2 1.2.2. Terms Several notational conventions are used in this manual. Some paragraphs may use Note, Caution, or Warning as a heading. These headings have the following meaning: ConventionDescription CautionIdentifies info

28、rmation that, if not heeded, may cause damage to the 425 or other equipment in your system. NOTEIdentifies information that needs extra emphasis. A Note generally supplies extra information to help you use the 425 better. WarningIdentifies information that, if ignored, may be hazardous to your healt

29、h or that of others. In addition, certain typefaces and capitalization are used to identify certain words. These situations are: ConventionMeaning CAPITALSControls, switches or other markings on the chassis. BoldfaceStrong emphasis. 1.3. Other Safety Information Power SourceThis product is intended

30、to operate from a power source that does not apply more than 250V rms between the power supply conductors or between either power supply conductor and ground. A protective ground connection, by way of the grounding conductor in the power cord, is essential for safe operation GroundingThe chassis of

31、this product is grounded through the grounding conductor of the power cord. To avoid electric shock, plug the power cord into a properly wired receptacle before making any connections to the product. A protective ground connection, by way of the grounding conductor in the power cord, is essential fo

32、r safe operation. Danger from Loss of Ground If the protective ground connection is lost, all accessible conductive parts, including knobs and controls that may appear to be insulated, can render an electric shock. Proper Power CordUse only the power cord and connector specified for the product and

33、your operating locale. Use only a cord that is in good condition. Rev 2.0, 10/29/93 1-3 Proper FuseThe fuse is mounted internally and is not considered user serviceable. The fuseholder accepts American sized fuses (1/4 in dia.) or European sized fuses (5mm dia). For 117 VAC operation, the correct va

34、lue is 1/4A, 250VAC, fast blowing (bussman type AGC) For 230 VAC operation, the correct value is 1/8A, 250VAC, slow blowing (Bussman type MDL or GDC. Operating LocationDo not operate this equipment under any of the following conditions: explosive atmospheres, in wet locations, in inclement weather, improp