General Construction - Monacor DNU-300 Instrucciones Del Ensamblaje

Please unfold page 5. Then you can always see the
indicated circuit diagrams.
1 Applications
The DNU-300 is a printed circuit board for universal
applications for the construction of passive speaker
crossover networks in 2-way technique with a slope up to
24 dB or 18 dB and the possibility of bi-wiring or bi-am-
ping.
Furthermore, when using two DNU-300 PCBs exten-
sive 3-way circuits with 18 dB for all slope configurations,
impedance linearization for bass and midrange speakers as well as level attenuations for midrange speakers and
high range speakers can be constructed. One PCB is as-
sembled as low pass (LP) and high pass (HP), the other
PCB as midfrequency branch (LPHP).
2 Safety Notes
The printed circuit board must exactly be assembled
according to these instructions. In case connections or
components are mixed up, amplifier and speakers
may be damaged or destroyed. In especially unfavour-
able cases there is a fire hazard by short circuits or
danger by exploding capacitors.
In case of faulty calculation of the components
damage to speakers and amplifier may also occur as
well as burnings by overloaded components.
Prior to switching-on check the precise assembly and
correct connection as a precaution. Only operate the
crossover network if all speakers have been con-
nected.
If the component calculation is faulty or if the printed
circuit board is assembled in the wrong way, not cor-
rectly connected or used for purposes other than orig-
inally intended, no liability can be taken over for pos-
sible damage.
If the assembled printed circuit board is to be put out
of operation definitively, it must be disposed of in a lo-
cal recycling plant.

3 General Construction

The construction size, capability, and quality of the com-
ponents to be inserted can be selected as desired within
a technically reasonable range. No further drill holes or
mechanical auxiliary constructions are required to real-
ize the desired circuit. The circuit diagrams on page 5
show the possible maximum configurations when as-
sembling all existing component spaces:
Fig. 1: use as 2-way crossover network 18 dB LP /
18 dB HP
Fig. 2: use as midfrequency branch 18 dB /18 dB
Different circuits can now be built up within the individual
branches by omitting components or by inserting jump-
ers, if necessary.
Note: The markings of the components are placing indi-
cations which are in general not according to the corre-
sponding markings of existing circuit diagrams. It is
necessary to arrange the components to be inserted
according to their functions.
4 Assembly
If the DNU-300 is not to be connected to a bi-wiring ter-
minal, connect the inputs "IN B+" and "IN H+" as well as
"IN B-" and "IN H-" with each other in each case.
By no means connect "+" and "-" with each other!
For a clear overview the individual branches low pass
(LP) and high pass (HP) of the network are separately
dealt with in the following text.
4.1 The low pass (LP)
The low pass divides the midrange and high frequencies
from the bass speaker. This function can be carried out
with different slopes. Furthermore, the inductive rise of
the bass speaker impedance can be linearized. Please
refer to fig. 1.
4.1.1 Low pass 6 dB without impedance linearization
1) Assemble position L1.
2) Solder a jumper into position L2.
3) Connect the bass/midrange speaker to contacts
"+B " and "-B".
4.1.2 Low pass 6 dB with impedance linearization
1) Assemble positions L1, R1, and C2.
2) Solder a jumper into position L2.
3) Solder a jumper from "+B " to "Z" (PCB imprint
4) Connect the bass/midrange speaker to contacts "+B"
and "-B".
4.1.3 Low pass 12 dB without impedance lineariza-
tion
1) Assemble positions L1 and C1.
2) Solder a jumper into position L2.
3) Connect the bass/midrange speaker to contacts
"+B " and "-B".
4.1.4 Low pass 12 dB with impedance linearization
1) Assemble positions L1, R1, C1, and C2.
2) Solder a jumper into position L2.
3) Solder a jumper from "+B " to "Z" (PCB imprint
4) Connect the bass/midrange speaker to contacts "+B"
and "-B".
4.1.5 Low pass 18 dB without impedance lineariza-
tion
1) Assemble positions L1, L2, and C1.
2) Connect the bass/midrange speaker to contacts
"+B " and "-B".
4.1.6 Low pass 18 dB with impedance linearization
1) Assemble positions L1, L2, C1, C2, and R1.
2) Solder a jumper from "+B " to "Z" (PCB imprint
3) Connect the bass/midrange speaker to contacts "+B"
and "-B".
4.1.7 Low pass 24 dB without impedance linearization
1) Assemble positions L1, L2, C1, and C2 (as parallel
capacitor).
2) Solder a jumper into position R1.
3) Solder a jumper from "+B " to "Z" (PCB imprint
4) Connect the bass/midrange speaker to contacts "+B"
and "-B".
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