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Model 80 User Guide

Issue 4, March 1997

Studio Technologies, Inc.

Page 5

Foreword

I am pleased to present the Model 80 Stereo Analog Audio Distribution Amplifier. As both

president and owner of Studio Technologies, I take a very personal approach when de-

signing products. Getting older (38 as of this writing) has increased my appreciation of the

more subtle things in lifebe they a part of nature or the nuances contained in a well-

designed piece of electronic equipment. Do the technical and operational aspects of a

product work together to feel right? A Studio Technologies design is ready to go only

when I am completely satisfied.
Many fine people worked toward making the Model 80 happen. Mitch Budniak (ace

consulting engineer) designed many of the circuits. Jim Cunningham contributed to the

analog design. Carrie Loving provided engineering support. Barbara Govednik coordi-

nated the marketing communications aspects. Ben Kamen designed the automatic testing

routines. Al Lux designed the printed circuit board. Jim McGuire designed the graphics.

Fred Roeck performed the mechanical design. Joe Urbanczyk coordinated the safety

testing and agency approvals.
Additional thanks to Timothy Powell of Metro Mobile Recording, Glenview, Illinois, who

provided his excellent ears when issues of sonic quality arose. His extensive field and

studio experience was extremely helpful in keeping me on the audio straight and narrow.
Please contact me with your questions, comments, and suggestions. I can be reached by

voice at (847) 676-9177, fax at (847) 982-0747, or via the Internet @ www.studio-tech.com.

Sincerely,
Gordon K. Kapes

President

Summary of Contents for 80 M80-00273

Page 1: ...uhy Avenue Skokie Illinois 60077 U S A Telephone 847 676 9177 Fax 847 982 0747 www studio tech com Model 80 Stereo Analog Audio Distribution Amplifier User Guide Issue 4 March 1997 This User Guide is applicable for serial numbers Model 80 M80 00273 and later 50200 397 Issue 4 ...

Page 2: ...f Contents Foreword 5 Introduction 7 What This User Guide Covers 7 System Overview 7 System Features 7 Installation 9 Configuration 11 Operation 12 Troubleshooting 12 Technical Notes 14 Circuit Description 15 Specifications 19 Block Diagram Schematic Diagram Not included in PDF ...

Page 3: ...ce consulting engineer designed many of the circuits Jim Cunningham contributed to the analog design Carrie Loving provided engineering support Barbara Govednik coordi nated the marketing communications aspects Ben Kamen designed the automatic testing routines Al Lux designed the printed circuit board Jim McGuire designed the graphics Fred Roeck performed the mechanical design Joe Urbanczyk coordi...

Page 4: ... make installation and setup a simple job The AC mains input power is factory config ured for 100 120 or 220 240V 50 60Hz operation Components and construction standards make the Model 80 suitable for continuous operation even for on air broadcast applications System Features One Stereo Input The differential input circuitry is compat ible with balanced or unbalanced signals having a nominal level...

Page 5: ...urvived tough listening evalua tions by industry professionals These veterans had the ears to guide us in achieving the right performance The outcome is a product that achieves sonic excellence Design Philosophy Most audio distribution amplifiers contain a level trim adjustment on each output After careful study Studio Technologies concluded that these adjustments con fused and often interfered wi...

Page 6: ...are made using inch 3 conductor phone jacks The choice of phone jacks was simply a matter of real estate 20 XLR connectors don t quite fit on the back of a one rack space unit Don t be concerned about damage to your audio quality the jacks used in the Model 80 are manufactured by Neutrik of Switzerland and feature gold plated contacts for excellent performance Balanced Connection Input Output Slee...

Page 7: ... stereo line level outputs which are in tended for connection to a variety of ana log audio devices The outputs are electronically balanced and capable of driving balanced or unbalanced loads of 600 ohm or greater The outputs can be individually configured for a nominal output level of 10 or 4dBu so you can connect to all line level inputs with no hassle Prepare the output plugs so that tip is pos...

Page 8: ...an aid to calibration as well as serving as signal present indicators The following is a step by step procedure for using the ExactCal section to match an input signal with the Model 80 Set the level control fully counterclock wise all the way to the left end of the travel Supply a 1kHz sine wave to both the left and right line inputs Set the level of the source to be precisely the nomi nal operat...

Page 9: ...al is within the range of 18dB below and 0 5dB above the nominal oper ating level The LED labeled Hi will light any time the input signal is greater than 0 5dB below the nominal operating level This sounds a bit confusing but isn t really so hard to understand As an example if you have a nominal 4 signal con nected to the Model 80 s line input and the ExactCal section has been used to calibrate th...

Page 10: ...rcuitry Refer to the Configuration section of this guide for detailed instructions Intermittent Audio Connections Should you experience audio connections that seem to be flaky or intermittent refer to the Technical Notes section of this guide The inch 3 conductor phone jacks used on the Model 80 are of very high quality conforming to the industry standard EIA RS 453 Some plugs do not meet this sta...

Page 11: ...t to you Because the phone jacks used on the Model 80 do comply with the standard They expect to be mated with plugs that also meet the specification When interfac ing with the Model 80 be careful with the plugs you utilize Should a connection appear flaky sound noisy or make an intermittent contact the most likely prob lem is a nonstandard phone plug Replace the plug if this is the case You shoul...

Page 12: ...rs the designation K for kilo 1000 has been moved to the decimal point position A 4700 ohm resis tor is shown as 4K7 rather than 4 7K An example for a one percent value a 49900 ohm resistor would be shown as 49K9 For capacitors the letter r is simply substituted for the decimal point marking A 0 47uf capacitor is shown as r47uf Once you are accustomed to this system you may well prefer it Power Su...

Page 13: ...mon Analog Circuitry The Model 80 takes advantage of an excellent series of audio specific inte grated circuits from Analog Devices Using these parts saved us from using literally dozens of additional components More importantly performance levels were achieved that would have been difficult if not impossible to obtain with more conventional circuitry These Analog Devices parts have the common pre...

Page 14: ...lifier configured as a half wave synchronous rectifier The result ing DC output is smoothed via a resistor capacitor low pass filter The output of the low pass filter is connected to inputs on three sections of integrated circuit com parator Four precision resistors are con nected in series with the 15Vdc power supply rail to create three DC voltages These act as reference voltages and are used as...

Page 15: ...ces a 0 or 15Vdc logic signal is accessible to the user by way of the front panel The output of the op amp is capacitor coupled to the input of an SSM 2142 differential balanced line driver inte grated circuits The 2142 provides an electronically balanced low impedance output and is capable of driving high signal levels into 600 ohms or greater Because of the nature of a differential driver an eff...

Page 16: ...l Control allows calibration over 10 to 10dBu input range Right Trim Control allows adjustment of right input level over a 3dB range nominal Maximum Input Level 27 dBu balanced 21 dBu unbalanced Common Mode Rejection 90dB DC and 60Hz 85dB 20kHz 60dB 400kHz typical Audio Outputs Qty 8 stereo separate left and right output connectors Type electronically balanced direct coupled intended to drive load...

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