TIBET SOUND SYSTEM: September 2013

3-Way Active Crossover with Linear-Phase Response

The problems that exist in common crossover networks are known. The low-pass filter causes delay in the signal. On the contrary the high-pass filter causes be pre-ahead in the signal that it in goes through from this. So, the cross-frequency are created certain problems as 1] the signals of two filters confutation 2] the change of phase between the filters influence axial 3]to axial diagram depend from the frequency. The crossover circuit try it unties many from the problems that report above and are based on research of S. Lipshitz and J. Vanderkooy that was published in the magazine JAES (Journal Audio Engineering Society). A network crossover of linear phase it uses a low-pass department with the help of circuit of time delay and circuit of abstraction it gives in the exit signal with characteristically low-pass filter. This delay time is not constant for entire the area of frequencies, but is altered very late and mainly doesn't exist differences of phase between the signals of two outputs, neither even near in the cross-frequency.

Part List

R1-16=100Kohms	R23-24-25-26=37.5Kohms [33K+4.7K]	C12-13-20-21-22=1nF 100V MKT
R2-3-4-5=56Kohms	R30-31-32-33-34-35-36=10Kohms	C19-23-24-30-31-32-33=47nF 100V MKT
R6-27=37.5Kohms[33K+4.7K]	R37-38-39-40-41-41=10Kohms	C25-26-27-28-29=1nF 100V MKT
R8-9-12-13-14=10Kohms	R42-43-44=47Kohms	C36-37=1uF 100V MKT
R10-28=75Kohms (150K//150K)	R45-46=47 ohms	C38-39=47uF 25V
R11-29=NC	TR1-2-3-4=47Kohms trimmer or pot.	IC1=TL071
R15=56.3Kohms	C1-34-35=2.2uF 100V MKT	IC2-3-4-5-6-7=TL072-NE5532
R17=12Kohms	C2-3-7-8-14-15-18=47nF 100V MKT
R18-19-20-21-22=10Kohms	C4-5-6-9-10-11-16-17=10nF 100V MKT	All the rsestors is 1/4W 1% metal film

The crossover circuit is constituted as it appears from block diagram [Fig.2] from two low-pass filters of fourth order -24db/oct, one for the line of low frequency signals and one for the high frequency. In the same frequency function also the two delay-time units, T1 (for low cross frequency F1) and T2 (for high cross frequency F2) and give him of characteristically phase with the low-pass part. The circuit delays T1 imitate the delay time that import the filter of low frequencies LPF1, while the T2 imitates the delay time that import the filter of low frequencies LPF2 that exists in the line of mid frequencies. Then the signal that emanates from low-pass filter is removed with IC7A-B, from the signal that has suffered delay, result a signal that his characteristics is same with a signal that has passed in from a low-pass filter. In the exit of each line found a trimmer with that we can adjust the level and level between the loudspeakers. The circuit supply become from a stabilized voltage +/- 15V. The use of crossover networks of fourth-order Linkwitz heaves the cross-frequencies to find in -6db [Fig. 3].

In picture [Fig. 4], appear the basic circuits and the necessary types of calculation for the low-pass filters as well as circuits delay time. Also exist an example of calculation for crossfrequencies F1=200HZ and F2=3KHZ, that it will help in the calculation and the adaptation in your needs. The circuit comes from relative article of magazine Elektor. More theoretical details exist in article, also in relative articles of S. Lipshitz and J. Vanderkooy in the JAES.

R1 = 22K
R2 = 100K
R3 = 220R
R4 = 220R
R5 = 220R
R6 = 10K
R7 = 4K7
R8 = 1K
R9 = 20K Trim
R10 = 150K
R11 = 22K
R12 = 20K Trim
R13 = 4K7
R14 =2K2
R15 = 220R
R16 = 220R
R17 = 180K
R18 = 22K
C1 = 4u7/25V
C2 = 10uF/25V
C3 = 220uF/25V
C4 = 220uF/25V
C5 = 1n2
C6 = 47n
C7 = 47n
C8 = 100n
C9 = 100n
C10 = 4u7/25V
C11 = 330uF/25V
C12 = 330uF/25V
IC1 = JRC4558
IC2 = TL074 - See more at: http://circuitschematicelectronics.blogspot.com/2011/03/subwoofer-booster-circuit.html#.Uj0PP1PKHXQ

Subwoofer rangkaian booster digunakan untuk enanching atau meningkatkan atau meningkatkan amplifier subwoofer , tetapi juga dapat meningkatkan kualitas bass suara pada amplifier atau High Power Amplifier . Subwoofer penguat Circui / bass enhancer sirkuit didasarkan pada IC 4558 dan TL074 atau yang biasa dikenal sebagai IC op-amp , cocok untuk menjadi meningkatkan dalam sistem subwoofer, yang bersama-sama dengan beberapa komponen.

Untuk subwoofer booster ini / enhancher sirkuit menggunakan tegangan 12 V +, 12V -, dan tanah. Agar sesuai dengan kekuatan speaker dan amplifier , yang Subwoofer rangkaian booster / subwoofer enhancer juga dilengkapi dengan subwoofer pengaturan volume pada R9 dan R12 menggunakan 20 K ohm trimpot. Ditempatkan sirkuit output subwoofer cukup tinggi, sehingga cocok untuk beberapa pembicara.

Subwoofer rangkaian booster

Bagian Daftar :

R1 = 22K
R2 = 100K
R3 = 220R
R4 = 220R
R5 = 220R
R6 = 10K
R7 = 4K7
R8 = 1K
R9 = 20K Potong
R10 = 150K
R11 = 22K
R12 = 20K Potong
R13 = 4K7
R14 = 2K2
R15 = 220R
R16 = 220R
R17 = 180K
R18 = 22K
C1 = 4u7/25V
C2 = 10uF/25V
C3 = 220uF/25V
C4 = 220uF/25V
C5 = 1N2
C6 = 47N
C7 = 47N
C8 = 100N
C9 = 100N
C10 = 4u7/25V
C11 = 330uF / 25V
C12 = 330uF/25V
IC1 = JRC4558
IC2 = TL074

- See more at: http://circuitschematicelectronics.blogspot.com/2011/03/subwoofer-booster-circuit.html#.Uj0PP1PKHXQ

booster circuit is used to enanching or boosting or increase the subwoofer amplifier, but it also can improve the quality of the bass sound on an amplifier or High Power Amplifier. Subwoofer booster circui / bass enhancer circuit based on the IC 4558 and TL074 or commonly known as IC op-amp , its suitable to be an boosting in subwoofer system, which together with some components.

For this subwoofer booster / enhancher circuit using voltage of 12 V + , 12V - , and ground. To be in accordance with the power of the speakers and amplifiers , the Subwoofer booster circuit / subwoofer enhancer is also equipped with a subwoofer volume setting on the R9 and R12 use 20 K ohm trimpot. Issued a circuit of subwoofer output is quite high , making it suitable for some speakers.

Subwoofer booster circuit

Part List :

R1 = 22K
R2 = 100K
R3 = 220R
R4 = 220R
R5 = 220R
R6 = 10K
R7 = 4K7
R8 = 1K
R9 = 20K Trim
R10 = 150K
R11 = 22K
R12 = 20K Trim
R13 = 4K7
R14 =2K2
R15 = 220R
R16 = 220R
R17 = 180K
R18 = 22K
C1 = 4u7/25V
C2 = 10uF/25V
C3 = 220uF/25V
C4 = 220uF/25V
C5 = 1n2
C6 = 47n
C7 = 47n
C8 = 100n
C9 = 100n
C10 = 4u7/25V
C11 = 330uF/25V
C12 = 330uF/25V
IC1 = JRC4558
IC2 = TL074

- See more at: http://circuitschematicelectronics.blogspot.com/2011/03/subwoofer-booster-circuit.html#.Uj0MElPKHXQ

Subwoofer booster circuit

Part List :

R1 = 22K
R2 = 100K
R3 = 220R
R4 = 220R
R5 = 220R
R6 = 10K
R7 = 4K7
R8 = 1K
R9 = 20K Trim
R10 = 150K
R11 = 22K
R12 = 20K Trim
R13 = 4K7
R14 =2K2
R15 = 220R
R16 = 220R
R17 = 180K
R18 = 22K
C1 = 4u7/25V
C2 = 10uF/25V
C3 = 220uF/25V
C4 = 220uF/25V
C5 = 1n2
C6 = 47n
C7 = 47n
C8 = 100n
C9 = 100n
C10 = 4u7/25V
C11 = 330uF/25V
C12 = 330uF/25V
IC1 = JRC4558
IC2 = TL074

- See more at: http://circuitschematicelectronics.blogspot.com/2011/03/subwoofer-booster-circuit.html#.Uj0MElPKHXQ