📄 3way_active_crossover_with_linear_phase_eng.htm
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<title>3-Way Active Crossover with Linearity Phase eng</title>
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<td width="100%" bgcolor="#800000"><p align="center"><em><font color="#FFFF00"
face="Verdana"><strong>3-Way Active Crossover with Linear-Phase Response</strong></font></em></td>
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<td width="100%"><p align="center"><img
src="3w_cross_lin_phase_1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/3w_cross_linear_phase/3w_cross_lin_phase_1.gif" width="962" height="486"
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<td width="100%"><font FACE="Verdana" SIZE="2">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. </font><p> </p>
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<td width="33%" bgcolor="#FFFF80"><p align="center"><strong><font color="#FF0000">Part
List</font></strong></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R1-16=100Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R23-24-25-26=37.5Kohms
[33K+4.7K]</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C12-13-20-21-22=1nF 100V MKT</font></small></td>
</tr>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R2-3-4-5=56Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R30-31-32-33-34-35-36=10Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C19-23-24-30-31-32-33=47nF
100V MKT</font></small></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R6-27=37.5Kohms[33K+4.7K]</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R37-38-39-40-41-41=10Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C25-26-27-28-29=1nF 100V MKT</font></small></td>
</tr>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R8-9-12-13-14=10Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R42-43-44=47Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C36-37=1uF 100V MKT</font></small></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R10-28=75Kohms (150K//150K)</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R45-46=47 ohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C38-39=47uF 25V</font></small></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R11-29=NC</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">TR1-2-3-4=47Kohms trimmer or
pot.</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">IC1=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>TL071</strong></a></font></small></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R15=56.3Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C1-34-35=2.2uF 100V MKT</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">IC2-3-4-5-6-7=<a
href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>TL072-NE5532</strong></a></font></small></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R17=12Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C2-3-7-8-14-15-18=47nF 100V
MKT</font></small></td>
<td width="34%" bgcolor="#FFF1EA"></td>
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<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">R18-19-20-21-22=10Kohms</font></small></td>
<td width="33%" bgcolor="#FFF1EA"><small><font face="Verdana">C4-5-6-9-10-11-16-17=10nF
100V MKT</font></small></td>
<td width="34%" bgcolor="#FFF1EA"><small><font face="Verdana">All the rsestors is 1/4W 1%
metal film</font></small></td>
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<td width="100%"><font color="#FFFFFF">.</font></td>
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<td width="100%"><p align="center"><img
src="3w_cross_lin_phase_2.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/3w_cross_linear_phase/3w_cross_lin_phase_2.gif" width="623" height="485"
alt="3w_cross_lin_phase_2.gif (6620 bytes)"></p>
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<td width="100%"><font FACE="Verdana" SIZE="2">The crossover circuit is constituted as it
appears from block diagram [<strong>Fig.2</strong>] 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 [<strong>Fig. 3</strong>]. </font></td>
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<td width="100%"><p align="center"><img
src="3w_cross_lin_phase_3.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/3w_cross_linear_phase/3w_cross_lin_phase_3.gif" width="818" height="540"
alt="3w_cross_lin_phase_3.gif (14537 bytes)"></p>
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<td width="100%"><font FACE="Verdana" SIZE="2"><p ALIGN="JUSTIFY">In picture [<strong>Fig.
4</strong>], 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 <strong>S.
Lipshitz</strong> and <strong>J. Vanderkooy</strong> in the <a href="javascript:if(confirm('http://www.aes.org/ \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.aes.org/'" tppabs="http://www.aes.org/"
target="_blank"><strong>JAES</strong></a>. </font></td>
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<li><font SIZE="4"><p ALIGN="JUSTIFY"></font><font face="Verdana" size="1"><strong>A Family
of Linear-Phase Crossover Networks of High Slope Derived by Time Delay</strong> <i><b>Vol.
31, Number 1 pp. 2 (1983)</b></i> <b>Author:</b> Stanley P. Lipshitz and John Vanderkooy <b>Abstract:</b>
The design of linear-phase crossover networks has until now necessitated the use of
crossovers, at least one of whose outputs suffers from either frequency response ripple in
the passband or low rolloff rate in the stopband. It may be desirable, at leas</font><font
size="1"></p>
</font></li>
<li><font size="1"><p ALIGN="JUSTIFY"><font face="Verdana"><strong>Use of Frequency Overlap
and Equalization to Produce High-Slope Linear-Phase Loudspeaker Crossover Networks</strong>
<i><b>Vol. 33, Number 3 pp. 114 (1985)</b></i> <b>Author:</b> Stanley P. Lipshitz
and John Vanderkooy <b>Abstract:</b> It has been shown that linear-phase crossovers
of high slope can be synthesized by subtracting a suitable low-pass output from a
time-delayed version of the input signal. It would be nice to be</font></font><font
face="Verdana" size="1"> able to avoid the expense of such an electronic time-delay</font></p>
</li>
<li><p ALIGN="JUSTIFY"><a href="2way_active_crossover_with_linear_phase.htm" tppabs="http://users.otenet.gr/~athsam/2way_active_crossover_with_linear_phase.htm"><small><font
face="Verdana"><strong>2-Way Active Crossover with Linear Phase Response</strong></font></small></a></p>
</li>
</ul>
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<td width="100%"><p align="center"><small><strong><font face="Westminster" color="#FF0000">Sam
Electronic Circuits </font></strong><font color="#FF0000" face="Arial"><small><small>11/02</small></small></font></small></td>
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