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-Ω 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° Filter ...................................................................................................1.914.533..............................................26
2.1.18 Dual Vox Detector ...................................................................................1.914.534..............................................28
2.1.19 Microphone Amplifier with Limiter ........................................................1.914.539..............................................29
2.1.20 Dual Fader/VCA Control Voltage Interface ...........................................1.914.540 /541.....................................31
2.2 Euro-Cards......................................................................................................... ...............................................................32
2.2.1 Motherboard for 4 MS-Cards ..................................................................1.915.770..............................................32
2.2.2 Power Supply ............................................................................................1.915.100..............................................33
2.2.3 Audio Generator .......................................................................................1.915.200..............................................35
2.2.4 Monitor Amplifier and Switching Relays (Studio/CR) .........................1.915.304..............................................37
2.2.5 Distribution Amplifier .............................................................................1.915.307/308......................................39
2.2.6 5 W Power Amplifier ...............................................................................1.915.410/415......................................41
2.2.7 40 W Power Amplifier .............................................................................1.915.440/441......................................43
2.2.8 Monitor Switching Relays ........................................................................1.915.601/602......................................45
2.2.9 Transistor-Driven Relays (7+2) ...............................................................1.915.603..............................................47
2.2.10 Dual Limiter .............................................................................................1.915.700..............................................49
2.2.11 Telephone Hybrid .....................................................................................1.915.760/764......................................51
2.2.12 Line Equalizer ...........................................................................................1.915.776/777/779..............................53
2.2.13 Dual Balancing Unit/Dual Line Amplifier ..............................................1.915.904..............................................56
2.3 Racks and Frames .............................................................................................. ...............................................................59
2.3.1 19” Mounting Frame for 3 Euro-Cards ..................................................1.918.100..............................................59
2.3.2 19” Ventilation Unit/19” Blank Panels .................................................1.918.119/0XX.....................................61
2.3.3 19” Euro-Card Mounting Frames ...........................................................1.918.318/319......................................62
2.3.4 19” Euro-Card Mounting Accessories .................................................... ...............................................................63
Date printed: 29.11.01 E1
Professional Audio System Components
1 INTRODUCTION
The individual descriptions and application notes contained in this brochure 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 almost 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 circuit 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: sales@studer.ch
We reserve the right to change the design and the performance specifications of the products listed here as technical progress may warrant.
Date printed: 29.11.01 E3
Professional Audio System Components
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 particular 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 common to the modular sub-cards, and 4 × 6 individual lines joining the plugin 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-Ω 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 either 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.
E4 Date printed: 29.11.01
Professional Audio System Components
2.1 Modular Sub-Cards (MSCs)
2.1.1 Motherboard for 1 MS-Card 1.914.500
If only one MS-card is used, this motherboard is helpful for both mechanical 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 Eurocard rack. Please refer to chapter 2.2.1.
Ordering Information Motherboard for 1 MS-card 1.914.500.xx
2.1.2 Breadboarding Card 1.914.529
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 individual component placement.
Ordering Information: Breadboarding card 1.914.529.xx
Date printed: 29.11.01 E5
Professional Audio System Components
2.1.3 Line Output Amplifier 1.914.501
Designed for operation at a nominal line level of +6 dBu (1.55 V
amplifier can handle levels of up to +24 dBu (12.3 V
), providing an ex-
rms
rms
), this
cellent overload margin without the risk of clipping. A unique circuit
around the primary of the amplifier’s 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.
E6 Date printed: 29.11.01
Professional Audio System Components
Technical Specifications
Input: Impedance > 10 kΩ, electronically balanced (transformerless)
Overload point +24 dBu
Output: Impedance < 50 Ω, balanced and floating
Minimum load 200 Ω
Maximum level +24 dBu
Gain –2 dB...+28 dB; adjustment: coarse 0 or 15 dB/fine –2 dB...+13 dB
Frequency response ±0.2 dB, 30 Hz...16 kHz
THD < 0.01%, 30 Hz...16 kHz
Equivalent input noise < –106 dB, linear, at 6 dB gain
Supply: ±15 V (25 mA idling; max. 170 mA at +24 dBu into 200 Ω)
Dimensions: MS-card, 34 × 85 mm
Ordering Information: Line output amplifier 1.914.501.xx
Date printed: 29.11.01 E7
Professional Audio System Components
2.1.4 High-Level Input Amplifier 1.914.502/504
Basically, this is an amplifier with near 0 dB gain for high-level applications, yet with additional features, such as remote muting facility, RF input
filter, and choice of two input and output impedances. The input configuration is balanced, whereas the output is unbalanced. Jumpers in the primary of the input circuit permit selection of either high-impedance operation with RF filter or a 0-Ω input without filter, for summing-bus applications. The combining (mixing) resistors have to be added externally.
By switching pin3 of the amplifier’s 13-pin plug to ground (via a corresponding connection on the motherboard) the amplifier may be muted
from a remote point. If only 20 dB level reduction is desirable instead of
muting, this can be programmed by connecting a resistor across two solder points.
E8 Date printed: 29.11.01
Professional Audio System Components
The amplifier may be used, for example, to work into a 600 Ω load, or
into the input of a 0-Ω input amplifier of another summing circuit.
If transformerless yet balanced input configuration is desired, an MSC
amplifier with basically the same performance characteristics is available
as well. Refer to the ordering information below.
Technical Specifications
Input: Impedance > 10 kΩ (transformer- or electronically balanced versions available; input
with RF filter; 0-Ω input selectable with jumpers)
Common mode rejection > 50 dB
Overload point +24 dBu (12.3 V
Output: Impedance 33 Ω (pin1), unbalanced
Minimum load 600 Ω
Maximum level +20 dBu (7.75 V
Impedance 3.3 kΩ (pin2), unbalanced, for 0-Ω operation
Maximum gain 1 dB
Maximum attenuation 30 dB
Frequency response ±0.3 dB, 30 Hz...16 kHz
THD < 0.03%, 30 Hz...16 kHz
Equivalent input noise –100 dBu, unweighted, at 6 dB attenuation
Programmable attenuation 20 dB (resistor 33 kΩ across muting circuit)
rms
rms
)
)
Supply: ±15 V (11 mA idling)
Dimensions: MS-card, 34 × 85 mm
Ordering Information: High level input amp with transformer-balanced input 1.914.502.xx
High level input amp with electronically balanced input 1.914.504.xx
Date printed: 29.11.01 E9
Studer Audio Components
p
)
HL Input Amp, transformer-balanced 1.914.502.81 ( 1)
Part No. Qty. Type/Val. DescriptionPos.Idx. Part No. Qty. Type/Val. DescriptionPos.Idx.
C 1 59.05.1681 680p PP, 1%, 630V0
C 2 59.05.1681 680p PP, 1%, 630V0
C 3 59.06.5682 6n8 PETP, 63V, 5%, RM50
C 5 59.34.5391 390p CER 63V, 5%, N15000
C 6 59.34.2220 22p CER 63V, 5%, N1500
C 11 59.26.0470 47u SAL 6.3V 20%0
C 12 59.32.4102 1n0 CER 20%, 50V0
C 13 not used 1n0 PETP, 63V, 10%, RM50
C 14 59.26.0470 47u SAL 6.3V 20%0
C 15 59.06.0102 1n0 PETP, 63V, 10%, RM50
C 16 59.26.0470 47u SAL 6.3V 20%0
C 17 59.26.2689 6u8 SAL 16V 20%0
C 18 59.26.2689 6u8 SAL 16V 20%0
C 19 59.06.0102 1n0 PETP, 63V, 10%, RM50
D 1 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
D 2 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
D 3 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
IC 1 50.05.0244 5534A Single Op-amp, low noise0
IC 2 50.09.0106 5532A Dual Op-Amp, low noise0
J 1 54.01.0021 Jumper 0.63*0.63mm, Au0
J 2 54.01.0021 Jumper 0.63*0.63mm, Au0
J 3 54.01.0021 Jumper 0.63*0.63mm, Au0
P 1 54.01.0273 1 3p Stecker CIS parallelsteck0
P 2 54.01.0020 1 p Pin, 1reihig, gerade0 11 pcs
Q 1 50.03.0350 J112 JFET N-Channel0
Q 2 50.03.0350 J112 JFET N-Channel0
R 1 57.11.3152 1k5 MF, 1%, 02070
R 2 57.11.3392 3k9 MF, 1%, 02070
R 3 57.11.3152 1k5 MF, 1%, 02070
R 4 57.11.3392 3k9 MF, 1%, 02070
R 5 57.11.3392 3k9 MF, 1%, 02070
R 6 57.11.3472 4k7 MF, 1%, 02070
R 7 57.11.3432 4k3 MF, 1%, 02070
R 8 57.11.3101 100R MF, 1%, 02070
R 11 57.11.3104 1 00k MF, 1%, 02070
R 12 57.11.3332 3 k3 MF, 1%, 02070
R 13 57.11.3223 2 2k MF, 1%, 02070
R 14 not used 33k MF, 1%, 02070
R 15 57.11.3104 1 00k MF, 1%, 02070
R 16 57.11.5106 1 0M MF, 5%, 02070
R 17 57.11.5335 3 M3 MF, 5%, 02070
R 18 57.11.5335 3 M3 MF, 5%, 02070
R 19 57.11.3151 1 50R MF, 1%, 02070
R 20 57.11.3821 8 20R MF, 1%, 02070
R 21 58.01.9202 2 k0 Cermet, 10%, 0.5W, vertical0
R 22 57.11.3561 5 60R MF, 1%, 02070
R 23 57.11.3104 1 00k MF, 1%, 02070
R 24 57.11.3330 3 3R MF, 1%, 02070
R 25 57.11.3332 3 k3 MF, 1%, 02070
R 26 57.99.0206 5 0R PTC, 25V, 0.5W0
R 27 57.99.0206 5 0R PTC, 25V, 0.5W0
R 28 57.11.3104 1 00k MF, 1%, 02070
T 1 1.022.451.00 1:0.62 EINGANGSTRAFO 1 : 0,620
W 1 57.11.3000 0R0 MF, 02071
W 2 64.01.0106 0.6mm Schaltdraht Cu1
tional (20 dB attenuation
o
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(01) W1, W2 added
End of List
Date printed: 06.11.2006
Studer Audio Components
p
)
HL Input Amp, electronically balanced 1.914.504.81 ( 1)
Part No. Qty. Type/Val. DescriptionPos.Idx. Part No. Qty. Type/Val. DescriptionPos.Idx.
C 1 59.05.1681 680p PP, 1%, 630V0
C 2 59.05.1681 680p PP, 1%, 630V0
C 3 59.26.0470 47u SAL 6.3V 20%0
C 4 59.26.0470 47u SAL 6.3V 20%0
C 5 59.34.2101 100p CER 63V, 5%, N1500
C 6 59.34.2220 22p CER 63V, 5%, N1500
C 7 59.34.2101 100p CER 63V, 5%, N1500
C 11 59.26.0470 4 7u SAL 6.3V 20%0
C 12 59.32.4102 1 n0 CER 20%, 50V0
C 14 59.26.0470 4 7u SAL 6.3V 20%0
C 15 59.06.0102 1 n0 PETP, 63V, 10%, RM50
C 16 59.26.0470 4 7u SAL 6.3V 20%0
C 17 59.26.2689 6 u8 SAL 16V 20%0
C 18 59.26.2689 6 u8 SAL 16V 20%0
C 19 59.06.0102 1 n0 PETP, 63V, 10%, RM50
D 1 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
D 2 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
D 3 50.04.0125 1N4448 75V, 150mA, 4ns, DO-350
IC 1 50.05.0244 5534A Single Op-amp, low noise0
IC 2 50.09.0106 5532A Dual Op-Amp, low noise0
J 1 54.01.0021 Jumper 0.63*0.63mm, Au0
J 2 54.01.0021 Jumper 0.63*0.63mm, Au0
J 3 54.01.0021 Jumper 0.63*0.63mm, Au0
P 1 54.01.0273 1 3p Stecker CIS parallelsteck0
P 2 54.01.0020 1 p Pin, 1reihig, gerade09 pcs
Q 1 50.03.0350 J112 JFET N-Channel0
Q 2 50.03.0350 J112 JFET N-Channel0
R 1 57.11.3152 1k5 MF, 1%, 02070
R 2 57.11.3392 3k9 MF, 1%, 02070
R 3 57.11.3152 1k5 MF, 1%, 02070
R 4 57.11.3392 3k9 MF, 1%, 02070
R 5 57.11.3104 100k MF, 1%, 02070
R 6 57.11.3104 100k MF, 1%, 02070
R 7 57.11.3332 3k3 MF, 1%, 02070
R 8 57.11.3332 3k3 MF, 1%, 02070
R 11 57.11.3104 1 00k MF, 1%, 02070
R 12 57.11.3332 3 k3 MF, 1%, 02070
R 13 57.11.3223 2 2k MF, 1%, 02070
R 14 not used 33k MF, 1%, 02070
R 15 57.11.3104 1 00k MF, 1%, 02070
R 16 57.11.5106 1 0M MF, 5%, 02070
R 17 57.11.5335 3 M3 MF, 5%, 02070
R 18 57.11.5335 3 M3 MF, 5%, 02070
R 19 57.11.3151 1 50R MF, 1%, 02070
R 20 57.11.3821 8 20R MF, 1%, 02070
R 21 58.01.9202 2 k0 Cermet, 10%, 0.5W, vertical0
R 22 57.11.3471 4 70R MF, 1%, 02070
R 23 57.11.3104 1 00k MF, 1%, 02070
R 24 57.11.3330 3 3R MF, 1%, 02070
R 25 57.11.3332 3 k3 MF, 1%, 02070
R 26 57.99.0206 5 0R PTC, 25V, 0.5W0
R 27 57.99.0206 5 0R PTC, 25V, 0.5W0
R 28 57.11.3104 1 00k MF, 1%, 02071
W 1 57.11.3000 0R0 MF, 02071
W 2 64.01.0106 0.6mm Schaltdraht Cu1
tional (20 dB attenuation
o
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(01) R28, W1, W2 added
End of List
Date printed: 06.11.2006
Professional Audio System Components
2.1.5 Loudspeaker Amplifier 1.914.505
This low-power amplifier on a modular sub-card is designed to drive a
10...15 Ω speaker. Power output is about 2...3 W. As can be concluded
from this specification, the amplifier is not intended for high-quality
monitoring. It will be ideally suited, however, for pre-fader listening and
similar applications. The amplifier’s input is balanced and floating, with
adjustable gain.
Technical Specifications
Input impedance > 10 kΩ, balanced and floating (with transformer)
Nominal power output 2 W into 15 Ω
Power output 25 mW...2.5 W into 15 Ω, with 0 dBu input
Distortion < 0.5% at 2 W
< 0.15% at 500 mW
S/N 99 dB, ref. to 2 W at max. gain
Frequency response –0.5 dB at 15 kHz
High pass filter 150 Hz, 12 dB/oct.
Supply: –24 V (40 mA idling, max. 220 mA fully driven)
Dimensions: MS-card, 34 × 85 mm
Ordering Information: Loudspeaker amplifier 1.914.505.xx
E10 Date printed: 29.11.01
Professional Audio System Components
2.1.6 Microphone Pre-Amplifiers 1.914.506/507
Two different microphone pre-amplifiers are available, for dynamic or
condenser microphones, and for electret microphones. Both offer high
gain and low noise, as is required for microphone pre-amplification.
1.914.506 features a balanced and floating input. It is designed for dynamic or condenser microphones with a source impedance of 200 Ω or
less. An RF filter is incorporated at the input transformer’s primary. Furthermore, the input is equipped with the resistors required for phantom
powering of condenser microphones.
1.914.507 is designed for unbalanced electret microphones requiring a
12 V supply.
A wide range of input levels can be accommodated (see level diagram).
By using the same solid-state switching circuit as can be found in the line
and high-level amplifiers, remote muting or activation of a fixed amount
of attenuation are possible as well.
The amplifier’s two outputs are unbalanced, with impedances of 3.3 kΩ
or 33 Ω, respectively.
Date printed: 29.11.01 E11
Professional Audio System Components
Technical Specifications
Input: Transformer-balanced and floating, with RF filter (1.914.506)
Unbalanced, with RF filter and electret supply (1.914.507)
Impedance > 1 kΩ, for microphones with an impedance of 200 Ω or less.
Max. input level –2 dBu (615 mV
Common mode rejection > 60 dB, unbalanced, to ground
); THD at 30 Hz: approx. 1%
rms
Output: Max. level +20 dBu (7.75 V
Nominal level 0 dBu (0.775 V
rms
rms
)
)
Impedance 33 Ω (pin1)
3.3 kΩ (pin2; to a 0-Ω amp.)
Minimum load 600 Ω
Max. gain 71 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 Ω
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 microphones 1.914.506.xx
• Microphone pre-amplifier for electret microphones 1.914.507.xx
E12 Date printed: 29.11.01
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