Funk Tonstudiotechnik SAM-3B.V2-EX User manual

OPERATING MANUAL
MULTI - BALANCING / DIFFERENTIAL / SUMMING - AND DISTRIBUTION
AMPLIFIER SYSTEM

2
BALANCING AMPLIFIER SAM - 3B.V2-EX
________________________________________________________________________________
TABLE OF CONTENTS
FOR YOUR SPECIAL ATTENTION Page 3
DESCRIPTION Page 4..6
OPERATING INSTRUCTIONS Page 7
INPUT/OUTPUT AMPLIFIER Page 8..10
STANDARD CONFIGURATION EXAMPLES Page 11..14
DISTRI UTOR CONFIGURATION EXAMPLES Page 15..22
HUM LOOPS Page 23
LOCK DIAGRAM Page 24
CONNECTOR ASSIGNMENT Page 25
SU -D ADAPTER 25/37-PIN Page 26..27
TECHNICAL DATA Page 28
INTERFERENCE RADIATION AND IMMUNITY Page 29
MAINTENANCE AND REPAIR Page 30
CE DECLARATION OF CONFORMITY Page 31

3
FOR YOUR SPECIAL ATTENTION
_______________________________________________________________________________________________
These operating instructions are generally valid for all versions of the SAM-3 .V2-EX as
long as no differences are pointed out.
ATTENTION :
Mains connection only permitted to AC voltage of 90..265 volts/45...400 Hz !
To avoid fire and electric shock, do not expose the unit to rain or moisture! If any liquid
enters the interior of the unit, switch it off immediately and have it checked by the
manufacturer or a specialist workshop before continuing to use it!
NOTES ON INSTALLATION :
Never place the unit near heat sources such as radiators or hot air outlets, or in locations
subject to a lot of dust, mechanical vibrations or shocks..
FOR CONDENSATION ACCUMULATION :
If the unit is moved immediately from a cold to a warm place, condensation may form
inside and there is a risk that the unit will not work properly. In this case, leave the unit
switched off for half an hour after transport.
FOR CLEANING :
Clean the housing, front panel and controls with a soft cloth lightly moistened with a mild
soap solution. Abrasive sponges, scouring powders and solvents such as alcohol or petrol
must not be used as they may attack the surface of the housing.
WARRANTY :
The warranty period is 3 years. Defects that are due to manufacture or faulty material
will be repaired free of charge during this period. The warranty claim expires after
external intervention!

4
INTRODUCTION...SAM-3B.V2-EX
_______________________________________________________________________________________________________________________________
4...16-CHANNEL MATCHING AMPLIFIER
INTENDED USE :
The SAM-3B.V2 EX is a professional MULTIANNAL UNIVERSAL SYMMETRIER/ IFFERENCE AMPLIFIER
with excellent sonic characteristics for balancing/asymmetrising/distributing and summing, as well
as for its high bandwidth for level and impedance matching for analogue audio or time code signals.
The SAM-3B.V2 EX differs from its predecessor SAM-3B by an stronger power supply with additional
reseven for special configurations and further optimised technical. ata. The second difference is
that it is easier to adjust the respective gain of the channels. This was made possible by extending
the spindle trimmers through the rear wall.
The unit can also be used, for example, for matching mixing consoles, sound cards and hi-fi
equipment with -10 dBv inputs/outputs and studio equipment inputs/outputs with +4 dBu or +6 dBu
standard levels.
The SAM-3B.V2 EX can enable the following functions simultaneously:
1. A high-impedance signal becomes low-impedance (impedance conversion).
2. an input signal can be amplified/attenuated
3. a balanced signal becomes asymmetrical (differential amplifier)
4. an asymmetrical signal becomes symmetrical (balancing amplifier)
5. Balanced signals can be summed (mixed).
6. balanced signals can be distributed
7. configurations as balancing and distribution amplifier possible at the same time
8. hum loops between asymmetrical units can be eliminated.
To ensure that the interference voltages induced or influenced on a line cause as little interference
as possible in an input of an audio control system connected to this line, this input must be
"symmetrical to earth", i.e. the two resistances measured between each of the input terminals and
earth must be equal in magnitude and phase.
The induced interference voltages, which are equal in magnitude and phase on both conductors,
then cancel each other out in their effect with a symmetrical input and have no influence. If the
symmetry is not exact, however, the induced voltage is not completely cancelled out and a residual
interference voltage remains in the subsequent transmission path.
The input amplifiers of the SAM-3B.V2
EX have an exceptionally high common-mode rejection to
optimally suppress interspersed interference voltages.

5
INTRODUCTION...SAM-3B.V2-EX
___________________________________________________________________________________________________________________________________
The use of integrated, laser-trimmed networks ensures a particularly high common-mode rejection
(CMMR) and consistency of the electrical characteristics. The balanced input stages of the
SAM-3B.V2 EX achieve a suppression of balanced interference in the ratio 300 000/1 = - 110 dB (at
1 kHz) ! This means that the interferences scattered on the transmission line are practically
completely eliminated.
uring the development of the unit, special emphasis was placed on lowest noise (dynamic range at
amplification 1: > 130 dB !) and minimal distortion, while at the same time ensuring a very
broadband design of all amplifier stages. The balanced input stages are designed as particularly
low-noise instrumentation amplifiers with high input impedance. This makes the SAM-3B.V2-EX one
of the lowest noise units of its kind. At the same time, the signal source is hardly burdened by this
circuitry measure. The phase response is less than 1° in the range 20 Hz...20 kHz!!
The balanced inputs of the SAM-3B.V2 EX can also be operated asymmetrically at the input (for
example as an asymmetrical catch-up amplifier/impedance converter or phase-rotation stage).
All balanced outputs are servo-balanced (cross-coupled). Therefore, once the output level has been
set, it remains constant with balanced and unbalanced connections and there are no negative
consequences for the transmission quality.
In contrast to the usual amplifier circuits, the headroom of the balanced outputs of the unit is the
same for balanced and asymmetrical circuits. circuitry. With normal electronically balanced
amplifier circuits, the headroom and thus the dynamic range decreases by typ. 4..6 dB with an
asymmetrical load!
Faultless operation at all outputs is guaranteed down to 300 Ω output load.
By designing the essential circuitry in SM technology, very compact dimensions of the circuit
boards were achieved with excellent crosstalk attenuation at the same time (1 kHz over 120 dB,
15 kHz over 110 dB). The SAM-3B.V2 EX is therefore also ideally suited for level correction on
independent main signal paths.
All inputs/outputs have separate spindle trimmers on the rear panel of the unit, with which the gain
can be adjusted externally very precisely and separately for each channel. The gain of the balancing
amplifiers can be changed from 0..23 dB. The asymmetric amplifiers have a selectable adjustment
range of 0...- 20 dB or +6...- 14 dB with internally set jumpers.
The unit has 37-pin -sub male connectors for connecting all inputs and outputs.
For special purposes and with expected input levels of max. + 18 dBu, the balanced input amplifiers
can operate with an additional gain of +6 dB in the first amplifier stage by closing a jumper. This
measure can further increase the overall dynamic range of the unit with smaller input signals.
Rear view

6
INTRODUCTION SAM-3B.V2-EX
___________________________________________________________________________________________________________________________________
Configurations :
The SAM-3B.V2 EX is modularly constructed with the 4-channel amplifier cards SIA-4.EX (balanced
inputs to asym. outputs) and SOA-4EX (asym. inputs to asym. outputs) and can therefore be
offered in different versions. ue to the service-friendly design, the amplifier modules incl. all
sockets can be exchanged, extended or retrofitted in a few minutes without soldering.
The balanced output modules (SOA-4EX) of the unit can also be configured internally as distribution
amplifiers (1 unbalanced input to 2 or more balanced outputs).
The unit is also available partially equipped with at least two 4-channel amplifier cards. These
versions can be subsequently expanded to a maximum of the 16-channel version.
The input and output amplifiers of the SAM 3B.V2 EX are internally equipped with pin connectors to
ensure a solder-free, quick replacement of the amplifier cards in case of malfunction.
In the standard versions, the unit has the following equipment:
SAM-3B.V2 EX/4-4 : 4 unbalanced inputs to 4 balanced outputs and
4 balanced inputs to 4 unbalanced outputs
SAM-3B.V2 EX/ -0 : 8 unbalanced inputs to 8 balanced outputs
SAM-3B.V2 EX/0- : 8 balanced inputs to 8 unbalanced outputs
SAM-3B.V2 EX/ - : 8 unbalanced inputs to 8 balanced outputs and
8 balanced inputs to 8 unbalanced outputs
SAM-3B.V2 EX/16-0 : 16 unbalanced inputs to 16 balanced outputs
SAM-3B.V2 EX/0-16 : 16 balanced inputs to 16 unbalanced outputs
Type designation :
The unit is available in many versions with channel-wise independent or interconnected amplifier
trains.
The type designation means :
1st digit after slash = number of balancing channels 2nd digit = number of differential channels (de-
symmetrizer).
Example: SAM-3B.V2/0-8 means: 0 balancing and 8 differential amplifier channels. The hyphen (-)
between the digits means: no connection between the amplifier channels. If this hyphen is replaced
by a letter or a combination of letters, all or some of the audio channels are internally connected to
each other, as described below.
Example: SAM-3B.V2/8v0 means: 8 balancing amplifier channels and 0 differential amplifier; the v
between the digits means: the balancing channels are internally configured as distribution
amplifiers. 1 unbalanced input is distributed to 8 balanced outputs.
Configurations with balancing amplifiers only (inputs asym. and outputs asym. in each case) or with
asymmetrical amplifiers/differential amplifiers only (inputs asym. and outputs asym. in each case)
are also available. Special versions with max. 8 balanced inputs on 8 balanced outputs as fully
balanced matching amplifier (SAM-3B.V2 EX/ 8SVS8) are also configurable (see also under
CONFIGURATION EXAMPLES). Also with the distribution amplifier configurations, each output in the
SAM-3B.V2 EX is separately adjustable in level.
S A M -3 B /8 - 8
Device type Device series Balancing
amplifier
Quantity
Difference
amplifier
Quantity
Audio connections between the boards
= no connection
= Distribution amp.
-
V
SVS
c onnections:
= Distribution amp. sym.

7
SAM-3B.V2-EX OPERATING INSTRUCTIONS
_______________________________________________________________________________
Zum Einstellen der Verstärkung der Ein/Ausgangsverstärker durch die Rückwandbohrungen nur
Schlitzschraubendreher mit 2...2,5 mm Klingenbreite und mindestens 30 mm Klingenlänge bzw.
Kreuzschlitzschraubendreher Größe 0 verwenden! Rechtsdrehung der Spindeltrimmer vergrößert die
Verstärkung.
To adjust the gain of the input/output amplifiers through the rear panel holes, use only slotted
screwdrivers with a blade width of 2...2.5 mm and a blade length of at least 30 mm or Phillips
screwdriver size 0! Clockwise rotation of the spindle trimmers increases the amplification
The max. 16 input signals are connected to 1 or 2 37-pin -sub male connectors. Required mating
connector: 37-pin Sub- female connector strip female.
The max. 16 output signals are connected to 1 or 2 37-pin -sub male connectors. Required mating
connector: 37-pin Sub- female connector strip female.
The required Sub- connectors are optionally available in different versions.
6.4 WIDE-RANGE POWER SUPPLY :
Considerable effort has been put into the newly developed power supply in order to prevent even
the slightest interference from being fed into the audio mass. Mains frequency interference
components or their harmonics are typically below -140 dB! in the audio signal and are therefore
no longer perceptible. The SMPS-24T.V2 soft-start precision switching power supply produces
extremely stable and pure supply voltages. ue to the particularly gentle switch-on process, no
interference pulses occur in the mains during switch-on and switch-off. The modern switching
power supply technology ensures low current consumption from the mains and thus the power
consumption of a fully equipped SAM-3B.V2 EX is only typ. 13 W. This applies to all mains supply
voltages between 100...245 V with frequencies of 45...400 Hz. The unit can therefore be used on
all common power supply networks worldwide. This technology generates less heat in the unit. In
addition to the positive effects on the environment, this effort also benefits the service life of the
unit.
A particularly extensive mains filter reliably eliminates interference that could otherwise enter the
SAM-3B.V2 EX via the mains supply.
The power supply unit generates 2 balanced stabilised supply voltages of +/- 20.0 V for feeding
the balancing amplifier modules. 2 LE s on the front panel serve to monitor these voltages. To
avoid damage to the amplifiers and loudspeakers in case of overload or short-circuit of a supply
voltage, the power supply unit has a monitoring of the symmetry of the output voltages. If a
defined limit value for the symmetry is exceeded even minimally, e.g. by overloading an output,
the second output automatically follows the overloaded one in the amount of the output voltage. In
the event of a short circuit at one output, both main voltages in the SMPS-24T.V2 are regulated
back and the amplifier stage involved is switched off. The symmetry monitoring of the two supply
voltages does not allow a greater difference than typically +/- 100 mV.
The noise on the power supply lines is below 10 µV rms at full load in the range of 20 Hz...22 kHz.!
ll stabilised supply voltages of the integrated power supply unit are short-circuit-proof due to
internal current limits and therefore do not require fuses. The unit works perfectly even with
strongly fluctuating or unclean mains voltages between 100...265 volts AC at frequencies of
45...400 Hz.
6.4.1 Overtemperature protection
When mounting the unit in a rack, make sure that there is sufficient ventilation, as the SAM-3B.V2
mainly cools via the surface of the housing. This applies especially to fully equipped units. The
power supply unit is temperature-monitored and switches off automatically if it heats up too much,
e.g. if the unit is installed very unfavourably in the rack. When the unit has reached a preset, safe
temperature again, the internal power supply unit restarts automatically. This process is signalled
by the two voltage monitoring LE s on the front.

8
SAM-3B.V2-EX INPUT AMPLIFIER (SIA-4EX)
_______________________________________________________________________________
The SIA-4EX serves as a 4-fold differential amplifier (instrumentation amplifier) in the unit.
Adjustment of the output levels is possible via the 19mm spindle trimmers P1a, P1b, P1c, P1d.
The input symmetry at 1 kHz is adjusted via the trimmers
P2a, P2b, P2c, P2d, the symmetry for high frequencies
(10 kHz) is adjusted via P3a, P3b, P3c, P3d. However,
these trimmers should not be changed under any
circumstances without precise technical knowledge and
appropriate measurement technology!
Assignment of the trimmers:
Signal Gain Symmetry Input CN1 Output CN2
CHANNEL 1 P1a P2a/P3a Pin 3 + 4 Pin 3
CHANNEL 2 P1b P2b/P3b Pin 7 + 8 Pin 7
CHANNEL 3 P1c P2c/P3c Pin 11 + 12 Pin 11
CHANNEL 4 P1d P2d/P3d Pin 15 + 16 Pin 15
All other contacts of the 20-pin post connector CN2 are
connected to ground (circuit zero). All other contacts of the
post connector CN1 are also grounded except for pin 19/20.
The supply voltages reach the amplifier board via CN 3.
Contact assignment CN3 : Pin 1 and 4 + 20,0 Volt
Pin 2 and 5 Ground
Pin 3 and 6 - 20,0 Volt
With the jumpers J1a, J1b, J1c, J1d the gain of the input stage of each channel can be increased
individually by +6 dB (adjustment of the gain then +6 dB...-14 dB).
Jumper J5 connects circuit zero of the board with 0V of the power supply. This jumper is closed in
the SAM-3B.V2. For special purposes, a "soft" coupling between circuit zero and 0V of the power
supply can be achieved by opening this jumper (0V and circuit zero are then bridged with 1 Ω).
Jumpers J2*...J4* determine the configuration of the individual channels. This is where the signal
flow on the board is set for summation and distribution. For more information, see the next page
and the chapter "Block diagram".
Simplified block diagram SIA-4EX Position of the jumpers and connectors
CN1
1
FUNK TONSTUDIOTEC HNIK
J6 CN3
O
U
T
J
4
B
P
4
1
2
1
2
I
N
P
U
T
J
1
D
J
2
D
J
3
D
P
2
D
P
3
D
J
5
D
SIA-4EX
J
1
C
J
2
C
J
3
C
P
2
C
P
3
C
J
5
C
J 1B
J2B
J3B
P2B P3B
J
5
B
CN2
J1A
J2A J3A
P2A P3A
J5A
J
4
P
J4A
P
3
P
2
P 1
OU TPU T STAGE
INSTR UMEN TATION
GAIN VAR IABLE 0...- 22 dB
C HAN NEL 1
C HAN NEL 2
SIA-4EX
3
8
4
7
8
4
C HAN NELL 4
15
16
16
C HAN NEL 3
11
12
12
CONNECTOR CN1 CONNECTOR CN2
AMPLIF IER INPU T
7
3
15
11

9
SAM-3B.V2-EX INPUT AMPLIFIER (SIA-4EX)
_______________________________________________________________________________
The functions of the SIA-4EX amplifiers are set by various solder jumpers on the circuit board. The
following diagram illustrates how these jumpers work.
umpers J1A..J1 are normally open. The gain of the input stage is then exactly 1 (0.0 dB). Closing
these jumpers increases the gain of the corresponding input stage by 6.0 dB.
Jumpers J2A..J2 are normally closed. For input signals that are to be mixed with others on the
board via the summing bus (green), these jumpers must be opened.
Jumpers J3Aa..J3 a are normally closed. This jumper must be opened if the output stage is not to
forward the signal of the corresponding input stage to the output, but the signal of the summing
bus. If, on the other hand, the input signal is to be mixed with other inputs, the jumper J3a..J3d
remains closed.
The jumpers J3Ab..J3 b are used to select the signals that are to be mixed via the summing bus.
To do this, the jumpers J4A..J4P must be partially or fully opened.
SIA-4EX
INPUT STAGE
BUFFER STAGE
SYMMETRIC
J1A
J2A
J3Aa
J3Ab
INPUT MIXING
DISTRIBUTION
OUTPUT
J1B
J2B
J3Ba
J3Bb
J1C
J2C
J4B
J3Cb
J1D
J2D
J3Da
J3Db
J4P
J4A
J3Ca
1
2
3
4
1
2
3
4
J5A
J5B
J5C
J5C
0 / +6 dB GAIN
UNBALANCED.

10
SAM-3B.V2-EX OUTPUT AMPLIFIER (SOA-4EX)
_______________________________________________________________________________
The SOA-4EX serves as a 4-fold balancing amplifier in the SAM-3B.V2 EX. Adjustment of the output
levels is possible via the 19 mm spindle trimmers P1..P4.
The output voltage and impedance symmetry is adjusted
via SM trimmers. These trimmers should not be changed
under any circumstances without precise technical
knowledge and appropriate measurement technology!
Assignment of the trimmers :
Signal Gain Input CN1 Output CN2
CHANNEL 1 P1 Pin 4 Pin 3 + 4
CHANNEL 2 P2 Pin 8 Pin 7 + 8
CHANNEL 3 P3 Pin 12 Pin 11 + 12
CHANNEL 4 P4 Pin 16 Pin 15 + 16
All other contacts of the 20-pin post connector CN1 are
connected to ground (circuit zero). All other contacts of the
post connector CN2 are also grounded except for pin 19/20.
The supply voltages reach the amplifier board via CN 3.
Contact assignment CN3 : Pin 1 and 4 + 20,0 Volt
Pin 2 and 5 Ground
Pin 3 and 6 - 20,0 Volt
With jumpers J1..J4, the gain of each channel can be fixed individually at 0 dB.
Jumper J5 connects circuit zero of the board with OV of the power supply. For special purposes, a
"soft" coupling between circuit zero and 0V of the power supply can be achieved by opening this
jumper (0V and circuit zero bridged with 1 Ohm).
Simplified block diagram SOA-4EX Position of jumpers and connectors
1
2
CN 1
1
2
1
2
OUT
C
N
2
J
5
P
1
P
2
P
3
P
4
C
N
3
P
2
P
3
P4P1
IN
OU T P U T STAGE
GAI N SE RVO -B ALANC E D
VARIAB LE 0...+ 24 dB
CH ANNE L 1
CH AN N E L 2
SOA-4EX
3
8
4
7
8
4
CH ANNE LL 4
15
16
16
CH ANNE L 3
11
12
12
CONNECTOR CN1 CONNECTOR CN2
7
3
15
11

11
STANDARD - CONFIGURATION EXAMPLES
_________________________________________________________________________________________________________
STANDARD CONFIGURATIONS :
The following diagram shows the schematic structure of an 8-channel balancing amplifier
The following diagram shows the schematic structure of an 8-channel differential amplifier
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
Symmetrierverstärker SAM-3A/8-0
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
AU SGAN GSSTUFE
+
-
+
-
OU T 8
OU T 6
OU T 4
OU T 2
OU T 7
OU T 5
OU T 3
OU T 1
VERSTÄRKUNG SYMMETRISCHE
VARIABEL 0...+20 dB
I N 1
I N 2
I N 3
I N 4
I N 5
I N 6
I N 7
I N 8
191816 171514131211
10
9
8
7654321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
DÄMPFUNG VARIABEL
EINGAN GSSTUFE
BUFFERSTUFE
INTERN 0.. .-20 dB
Differenzverstärker SAM-3A/0-8
SYMMETRISCHE
++ ++ ++ ++
-- -- -- --
1918
16 17
1514131211109
8
7
65432
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
I N 1
I N 2
I N 3
I N 4
I N 5
I N 6
I N 7
I N 8 OU T 8
OU T 7
OU T 6
OU T 5
OU T 4
OU T 3
OU T 2
OU T 1
Balancing amplifier AM-3B.V2-EX/8-0
Differential amplifier AM-3B.V2-EX/0-8

12
STANDARD - CONFIGURATION EXAMPLES
______________________________________________________________________________
STANDARD CONFIGURATIONS :
The following diagram shows the schematic structure of a 16-channel balancing amplifier and the
corresponding pin assignment of the 37-pin Sub- connectors on the SAM-3B.V2-EX :
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
Symmetrierverstärker SAM-3A/16-0
OUT 16
OUT 14
OUT 12
OUT 10
OUT 15
OUT 13
OUT 11
OUT 9
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
AUSGANGSSTUFE
+
-
+
-
OU T 8
OU T 6
OU T 4
OU T 2
OU T 7
OU T 5
OU T 3
OU T 1
VERSTÄRKUN G SYMMETRISCHE
VARIABEL 0...+20 dB
I N 16
I N 15
I N 14
I N 13
I N 12
I N 11
I N 10
I N 9
I N 1
I N 2
I N 3
I N 4
I N 5
I N 6
I N 7
I N 8
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
AUSGANGSSTUFE
+
-
+
-
VERSTÄRKUN G SYMMETRISCHE
VARIABEL 0...+20 dB
Balancing amplifier AM-3B.V2-EX/16-0

13
STANDARD - CONFIGURATION EXAMPLES
______________________________________________________________________________
STANDARD CONFIGURATIONS :
The following diagram shows the schematic structure of a 16-channel differential amplifier and the
corresponding pin assignment of the 37-pin sub- connectors on the SAM-3B.V2-EX :
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
DÄMPFUNG VARIABEL
EINGAN GSSTUFE
BU FFERSTUFE
IN TERN 0...-20 dB
Differenzverstärker SAM-3A/0-16
SYMMETRISCHE
++ ++ ++ ++
-- -- -- --
191816 1715141312
1110
9
8
7
65
43
2
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
DÄMPFUNG VARIABEL
EINGAN GSSTUFE
BU FFERSTUFE
IN TERN 0...-20 dB
SYMMETRISCHE
++ ++ ++ ++
-- -- -- --
191816 1715141312
1110
9
8
7
65
43
2
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
I N 16
I N 15
I N 14
I N 13
I N 12
I N 11
I N 10
I N 9
I N 1
I N 2
I N 3
I N 4
I N 5
I N 6
I N 7
I N 8 OU T 8
OU T 7
OU T 6
OU T 5
OU T 4
OU T 3
OU T 2
OU T 1
OUT 16
OUT 15
OUT 14
OUT 13
OUT 12
OUT 11
OUT 10
OUT 9
Differential amplifier AM-3B.V2-EX/0-16

14
STANDARD - CONFIGURATION EXAMPLES
______________________________________________________________________________
STANDARD CONFIGURATIONS :
The following diagram shows the schematic structure of an 8-channel balancing amplifier and an
8-channel differential amplifier and the corresponding pin assignment of the 37-pin sub-
connectors on the SAM-3B.V2-EX :
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
Symmetrier- und Differenzverstärker SAM-3A/8-8
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 16
DÄMPFUNG VARIABEL
EINGAN GSSTUFE
BU FFERSTUFE
OUT 14
OUT 12
OUT 10
OUT 15
OUT 13
OUT 11
OUT 9
IN TERN 0...-20 dB
SYMMETRISCHE
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
OU T 8
AUSGANGSSTUFE
+
-
+
-
OU T 6
OU T 4
OU T 2
OU T 7
OU T 5
OU T 3
OU T 1
VERSTÄRKUN G SYMMETRISCHE
VARIABEL 0...+20 dB
++ ++ ++ ++
-- -- -- --
I N 16
I N 15
I N 14
I N 13
I N 12
I N 11
I N 10
I N 9
191816 1715141312
1110
9
8
7
65
43
2
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
I N 1
I N 2
I N 3
I N 4
I N 5
I N 6
I N 7
I N 8
Balancing and differential amplifier AM-3B.V2-EX/8-8

15
SPECIAL VERSIONS ( fully balanced distribution amp. ) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The current versions of the SAM-3B.V2 EX can also be equipped with more than 16 amplifier
channels. This can be useful for distribution amplifiers that are to be fully balanced. The following
are some examples of such configurations.
The diagram below shows the schematic structure of a distribution amplifier 1x 1 on with 8
balanced output stages and 1 balanced input amplifier.
The following diagram shows the schematic structure of a distribution amplifier 2x 1 on 4
with 8 balanced output stages and 2 balanced input amplifiers n.
1918
16 17
1514131211109
8
7
65432
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 1-H
OUT 1-F
OUT 1-D
OUT 1-B
OUT 1-G
OUT 1-E
OUT 1-C
OUT 1-A
IN 1 +
-
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3A/8v1
AUSGANGSSTUFE
DÄMPFUNG VARIABEL
EINGANGSSTUFE
BUFFERSTUFE
INTERN 0...-20 dB
VERSTÄRKUNG
SYMMETRISCHE SYMMETRISCHE
VARIABEL 0...+20 dB
+
-
191816 1715141312
1110
9
8
7
654
3
2
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 2-D
OUT 2-C
OUT 2-B
OUT 2-A
OUT 1-D
OUT 1-C
OUT 1-B
OUT 1-A
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3A/8v2
AUSGANGSSTUFE
DÄMPFUNG VARIABEL
EINGANGSSTUFE
BUFFER STUFE
INTERN 0...-20 dB
VERSTÄRKUNGSYMMETRISCHE SYMMETRISCHE
VARIABEL 0...+20 dB
IN 2
IN 1 +
-
fully balanced distribution amplifier AM-3B.V2-EX/8v1
fully balanced distribution amplifier AM-3B.V2-EX/8v2

16
SPECIAL VERSIONS ( full- balanced distribution amp. ) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The following example shows the construction of a distribution amplifier 4x 1 on 2 with 8 balanced
output stages and 4 balanced input amplifiers with the corresponding wiring of the Sub-
connectors.
+
-
191816 17
1514131211109
8
7
65432
1
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 4-B
OUT 2-B
OUT 4-A
OUT 2-A
OUT 3-B
OUT 1-B
OUT 3-A
OUT 1-A
IN 2
IN 1 +
-
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
AUSG AN GSST UFE
DÄM P FUNG VAR IABE L
EINGANGSSTU F E
BUFFERST UFE
+
-
+
-
INTERN 0...-20 dB
VE RST ÄRK UN G
vollsymmetrischer Verteilverstärker SAM-3A/8v4
SYMM E TRI SC HE SYM M ETRI SCHE
VARIABEL 0...+20 dB
IN 3
IN 4 +
-
+
-
fully balanced distribution amplifier AM-3B.V2-EX/8v4

17
SPECIAL VERSIONS ( fully balanced distribution amp. ) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The following example shows the design of a distribution amplifier 1x 1 to 16 with 16 symmetrical
output stages and 1 symmetrical input amplifier with the corresponding wiring of the Sub-
connectors.
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3A/16v1
AU SGAN GSSTUFE
DÄMPFUNG VARIABEL
EI NGANGSSTUFE
BUFFER STUFE
INTE RN 0...-20 dB
VE RS TÄR KU NG
SYMME TRI SC HE SYMMETRISCHE
VARIABE L 0...+20 dB
191816 17
1514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 1-H
OUT 1-F
OUT 1-D
OUT 1-B
OUT 1-G
OUT 1-E
OUT 1-C
OUT 1-A
IN 1 +
-
OUT 1-Q
OUT 1-O
OUT 1-M
OUT 1-K
OUT 1-P
OUT 1-N
OUT 1-L
OUT 1-I
fully balanced distribution amplifier AM-3B.V2-EX/16v1

18
SPECIAL VERSIONS ( fully balanced distribution amp .) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The following example shows the construction of a distribution amplifier 2x 1 to 6 with 12
symmetrical output stages and 2 symmetrical input amplifiers with the corresponding wiring of the
Sub- connectors.
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3A/12v2
AU SGAN GSSTUFE
DÄMPFUNG VARIABEL
EI NGAN GS STU FE
BUFFERST UF E
INTER N 0...-20 dB
VE RS TÄR KU NG
SYMM E TRI SCHE SYM M ETRISC H E
VARIABE L 0... +20 dB
+ +
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 2-D
OUT 2-C
OUT 2-B
OUT 2-A
OUT 1-D
OUT 1-C
OUT 1-B
OUT 1-A
IN 1
+
-
+
-
IN 2
OUT 2-F
OUT 2-E
OUT 1-F
OUT 1-E
fully balanced distribution amplifier AM-3B.V2-EX/12v2

19
SPECIAL VERSIONS ( fully balanced distribution amp. ) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The following example shows the construction of a distribution amplifier 2x 1 on with 16
balanced output stages and 2 balanced input amplifiers with the corresponding wiring of the Sub-
connectors.
+
-
+
-
+
-
+
-
191816 171514131211109
8
76
5
4321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3B/16v2
AU SG AN G SSTUFE
DÄM P FUNG VARIABE L
EING ANGSSTUFE
BUFFE R ST U FE
INTE R N 0...-20 dB
VERSTÄRKUNG
SYMMET R I SC HE SYMMETRISC H E
VARI AB E L 0...+20 dB
+ +
-
191816 171514131211
29 30 31 32 33 34 35 36 37
-
+
-
+
-
191816 17
1514131211109
8
7
65432
1
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
OUT 2-D
OUT 2-C
OUT 2-B
OUT 2-A
OUT 1-D
OUT 1-C
OUT 1-B
OUT 1-A
IN 1
+
-
+
-
IN 2
OUT 2-F
OUT 2-E
OUT 1-F
OUT 1-E
+
-
+
-
109
8
76
5
4321
20 21 22 23 24 25 2726 28
-
+
-
+
-
OUT 2-H
OUT 2-G
OUT 1-H
OUT 1-G
fully balanced distribution amplifier AM-3B.V2-EX/16v2

20
SPECIAL VERSIONS ( fully balanced distribution amp. ) SAM-3B.V2-EX
______________________________________________________________________________
SPECIAL CONFIGURATIONS :
The following example shows the construction of a distribution amplifier 4x 1 on 4 with 16
balanced output stages and 4 balanced input amplifiers with the corresponding wiring of the Sub-
connectors.
DÄM PFUNG VARIABE L
EINGANGSSTUFE
BUFFER ST UFE
INTE RN 0...-20 dB
SYMM ET R ISC HE
191816 17
1514131211109
8
7654321
20 21 22 23 24 25 2726 28 29 30 31 32 33 34 35 36 37
OUT 4-B
OUT 2-B
OUT 4-A
OUT 2-A
OUT 3-B
OUT 1-B
OUT 3-A
OUT 1-A
IN 1 +
-
+
-
IN 2
OUT 4-C
OUT 2-C
OUT 3-C
OUT 1-C
OUT 4-D
OUT 2-D
OUT 3-D
OUT 1-D
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
AU SGANGSST UFE
+
-
+
-
VE RS TÄR KU NG
+
-
+
-
+
-
+
-
191816 171514131211109
8
7654321
20 21 22 23 24 25 27
26 28 29 30 31 32 33 34 35 36 37
-
+
-
+
-
+
-
+
-
vollsymmetrischer Verteilverstärker SAM-3A/16v4
SYMM E TRI SCH E
VARIABE L 0...+20 dB
+
-
+
-
IN 3
IN 4
fully balanced distribution amplifier AM-3B.V2-EX/16v4