📄 2ch_mixer_eng.htm
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<td width="100%" bgcolor="#800000"><p align="center"><font color="#FFFF00" face="Verdana"><em><strong>2Channel
+ Microphone Stereo Mixer</strong></em></font></td>
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<td width="100%"><p align="center"><img src="2ch_mixer_1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/2ch_mixer/2ch_mixer_1.gif"
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<td width="100%"><font FACE="Verdana" SIZE="2"><p ALIGN="JUSTIFY">A lot of friends me
asked to draw a more shrunk circuit 2-ch mixer, which will contain also, operation
CROSSFADER. The circuits can be modified and added also other channels, repeating basic
that I give. It can are added channels stereo PHONO/line or even channels microphone with
proportional modification of next stages. In the Fig.1 exist the input circuits of two
channels and input of microphone channel. The two basic channels she is same between them.
Thus that it抯 go for a channel, the he is also go for the other. In each stereo channel
exist two inputs, classic stereo input PHONO that is practical a correction filter RIAA
and concerns the signal amplification of sound that emanates from the classic reproduction
heads of classic disks LP. Exist also a stereo input of LINE 憭high level拻 for
signals that emanate from CD players, Tuners, DVD, etc. The exits of this two stages are
selected with switch S1 or S2 and they are applied in the next stage which is constituted
from adder IC3. Here is regulated the BALANCE with the RV5 and GAIN with the RV1. In the
next stage round the IC4 exist a classic 3-band regulation of tone circuit, the regulation
of which becomes with the RV2-3-4. The exit of IC4 drive the RV6 that is at preference
pontesometer [FADER]. By points 1-2-5-6 the signals connected to next stage [Fig.2]. In
the Fig.1 exist also the microphone input, which is in electronic Balance connection,
round the IC9A. Here exist the regulation of GAIN with the RV13. It follows a stage of
tone two-band regulation, round the IC9B and a stage of parametric regulation of mid band
with RV16 [Gain] and RV17 [Frequency Band]. With the RV19 we regulate VOLUME [FADER] and
with the RV18 we regulate the BALANCE. By points 9-10-11 the signal is connected to the
corresponding points that are found in the Fig. 2. </font></td>
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<td width="33%" bgcolor="#FFFF80"><p align="center"><font color="#FF0000"><strong>Part
List </strong><small>[Fig.1]</small></font></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R1-7-15-16-41-48-55-56=47 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C1-13-37-45=150pF
mylar-ceramic</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">IC1-5-9-10=<a
href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>NE5532</strong></a>-<strong><a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm">LM833</a></strong></font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R2-8-42-49=150 ohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C2-3-15-16-20-21-27-28-38-39=47nF
</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">IC2-3-4-67-8=<strong><a
href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm">TL072</a></strong></font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R3-5-9-11-43-45-50-52=180 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C4-5-9-11-42-44-47-48=18nF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV1-7= 22 Kohms Log.
pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R4-6-10-12-44-46-51-53=15 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C6-10-41-46=3.9nF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV2-3-8-9=2X100 Kohms Lin.
pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R13-14-17-18-47-54-57-58-95=100
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C7-12-43-49-82-83=5.6nF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV4-10=2X470 Kohms Lin.
pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R19-22-59-62-98-100=4.7
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C8-14-17-18-40-50-53-54-88=10uF
16V</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV5-11-18=10 Kohms Lin.
pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R20-23-60-63-21-24-61-64=10
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C19-30-55-66-89=22pF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV6-12=2X22 Kohms Log. pot.
45mm Slider [FADER]</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R25-26-33-34-65-66-70-71=10
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C22-31-58-67=47nF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV13=10 Kohms Log. pot.*</font></small></td>
</tr>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R27-35-67-73-74-75-78-79-96=10
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C23-32-59-68-25-34-61-70-85=4.7nF</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV14-15-16=47 Kohms Lin.
pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R28-29-36-37-68-69-76-77=3.3
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C24-33-60-69=22nF</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV17=2X100 Kohms Log.pot.*</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R30-31-38-39-70-71-78-79=1.8
Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C26-35-62-71=1.2nF</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV19=10 Kohms Log. pot. 45mm
Slider [FADER]</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R32-40-72-80=330 ohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C29-36-65-72-80-90=10uF 16V</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">J1-2-5-6=4pin conn. 2.54mm
pin step</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R81-83=2.2 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C56-57-63-64=47nF </font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">J3-4-7-8-9-10=3pin conn.
2.54mm pin step</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R82-97=6.8 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C73-74=1uF 100V MKT</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">Jf1....8=RCA female Jack </font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R84-88-93-94=22 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C75-76=68pF ceramic or mylar</font></small></td>
<td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">JF9=3pin XLR male</font></small></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R85=100 ohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C77-78-86-87=47nF</font></small></td>
<td width="34%" bgcolor="#FFF0E1"></td>
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<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R86-87=2.7 Kohms</font></small></td>
<td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C79=47uF 16V</font></small></td>
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