Two way cross-over 3500 Hz


Manufacture: Soulis
Papanastasiou


Two way cross over 3500 Hz

 

Note: The text is AUTO translated from
Greek version

 

Cross-over they are netting usually with passive
materials that have aim to separate a region of frequencies in
smaller. Cross-over the manufacture that to you we offer it separates
the acoustic region in two sub areas in order to we lead two
loudspeakers for the high frequencies and for low.

 

Cross-over they are essentially for the operation of
combination of loudspeakers. Without them, two things happen: on one
side are led all the frequencies simultaneously to different
loudspeakers and otherwise is consumed pointlessly force in loudspeakers
that cannot him attribute rightly. Cross-over depending on the number of
loudspeakers that leads they are distinguished in two streets and three
streets, even if they can result also complexes. The each region is
figuratively named street, through which will pass the corresponding
region of frequencies in order to it leads the corresponding
loudspeaker.

 

Two way cross over 3500 Hz #2

The simpler system is that of two streets. In that
acoustic region it is separated in two sub areas with two filters: one
of low passage and one high. The filter of low passage leads the
loudspeaker for the low frequencies and the filter of high frequencies
the loudspeaker for the high frequencies. The loudspeaker for the low
frequencies is known as woofer and the loudspeaker for the high
frequencies as tweeter.

The loudspeakers are distinguished by various
characteristics that him make distinguish between them. That
characteristics that us interest for the manufacture that we make, are
their complex or more simply resistance and diagram that us gives the
relation of attribution of sound as for

frequency
(sensitivity).

 
The resistance of loudspeakers is characterized in a
frequency depending on the destination and their press. Loudspeakers
are distinguished, as for the destination, in loudspeakers of low
frequencies, woofer intermediate, mid-range and high tweeter. Their
resistance in W is 4W, 8W and 16W. Cross-over that we present it is
intended for loudspeakers 8W.


Theoretical Circuit

Two way cross over 3500 Hz #3

The theoretical circuit appears in form 1. The
manufacture uses passive materials of mediocre dimensions. In order to
you make a cross-over you need printed circuit. Observing theoretical
circuit we see that it has a entry and two exits, In the entry connect
the exit of amplifier and in the exits the loudspeakers. In the one the
loudspeaker of high frequencies and in the other the loudspeaker of low
frequencies. The way from the entry to the loudspeaker of high
frequencies is not anything other, despite a filter of high frequencies.
Respectively, the way to the loudspeaker of low frequencies is a filter
of low passage. The filter of low passage consists by inductor L2 and
the capacitor C2. The inductor is en line with the circuit and the
capacitor at the same time with the loudspeaker.

 

The complex resistance of this elements changes,
associates the price of frequency. The price of complex resistance of
inductor of is proportional frequency and capacitor of reversely
proportional frequency. As long as increase the frequency, the
self-induction acquires bigger complex resistance and the capacitor
smaller. This, in combination with their provision, prevents the high
frequencies to reach in the loudspeaker. In the way of high pass filter
to the loudspeaker of high frequencies the provision of elements is
reversed. En line we place capacitor, a C1 and at the same time inductor
L1. In this provision as long as is increased the frequency, is
decreased the complex resistance of capacitor while his inductor that is
at the same time with the loudspeaker is increased. As long as it
increases the frequency, so much facilitates the capacitor the passage
of frequencies and so much least it absorbs the inductor force from
them.

Apart from the elements of filter in the circuit,
existence resistances and capacitors that stabilise the behaviour of
loudspeakers. An additional resistance, R3, offers a particular
operation. This resistance is always shorts from a safety. If for some
reason it passes big current, then is in danger is burned loudspeaker of
the high frequencies. Rather the loudspeaker is burned the safety. Then
is presented en line the resistance and is decreased the sound level.

 

 

 

Manufacture

In order to you make the manufacture you will need
the PCB that appears in form. In this mount materially that exists in
the theoretical circuit, according to form. The montage of materials
will begin from the resistances and flowingly will place the capacitors
and finally the self-induction. The inductors for the cross-over, if him
you find in trade you cans him order from us. In order to you try the
cross – over apply in the exit for the each loudspeaker a resistance
8W. In the entry you will connect a small amplifier with which you will
strengthen the signal of acoustic generator. The generator him you will
put it produces sine’ signal. Altering the frequency we observe the each
expense in an oscillograph. If all have well, then when is increased the
frequency and approaches the price 3,5kHz, the tendency in the exit for
the loudspeaker of low frequencies falls and the other increases.

Parts

R1 = 10

C1 = 3,3 uF

L1 = 0,82 mH

R2 = 3,3

C2 = 4,7uF

L2 = 1,2 mH

R3 = 33

C3 = 10uF

R4 = 10

Two way cross over 3500 Hz #4

 

Two way cross over 3500 Hz #5


Sorry, comments are closed!