2ch_mixer_eng.htm

内含各国最基础的电路图,并做了详细的说明,对做底层开发的人员很有用.

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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R89-90=5.6 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C81=2.2nF</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">*ALPS or PIHER type
        Potentiometer </font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R91-92=3.9 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C84=10nF</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">All the Resistors is 1/4W 1%
        metal film</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R99-101=10 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">S1-2=2X2 0N/ON SW</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">All the [nF] capacitors is
        63-100v 5% MKT</font></small></td>
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    <td width="100%"><p align="center"><img src="2ch_mixer_2.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/2ch_mixer/2ch_mixer_2.gif"
    width="891" height="825" alt="2ch_mixer_2.gif (31020 bytes)"></td>
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    <td width="100%"><font FACE="Verdana" SIZE="2"><p ALIGN="JUSTIFY">In the Fig.2 abut the
    various signals that emanate from the Fig.1. Switches S3-4-5 execute the operation of
    pre-Fader-listen [PFL] of proportional channels. If some switch functions then turns on
    corresponding diode led D4-5-6. Simultaneous turn-on the relay RL1 disconnect the program
    in the headphone and supply with the PFL signal. Round the IC14 exist the amplifier
    circuits of headphone drive. Round the IC12 exist the addition circuit of the signals from
    the two channels and the mic channel, as well the RV20 which function as CROSSFADER
    between the two stereo channels. The RV21 is final MASTER VOLUME [FADER] and adjust the
    final percentage of signal to the output. This role undertake the IC13 that has the
    leading possibility via the outputs Jf13-14 a power amplifier, simultaneously from the
    exits Jf11-12 we can take signal for recording. </font></p>
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        <td width="33%" bgcolor="#FFFF80"><p align="center"><font color="#FF0000"><strong>Part
        List </strong><small>[Fig.2]</small></font></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R102-103-106-107-113-114=10
        Kohms</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV20=2X22 Kohms Log. pot.
        45mm Slider [FADER]</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">Q2-4=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>BD140</strong></a></font></small></td>
      </tr>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R104-108-117-122-125-126=22
        Kohms</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV21=2X10 Kohms Log. pot.
        45mm Slider [FADER]</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">S3-4=3X2 PDT 0N/ON SW</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R105-109=1 Mohms</font></small></td>
        <td width="34%" bgcolor="#FFF0E1"><small><font face="Verdana">RV22=2X10 Kohms Log. pot.*</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">S5=2X2 PDT ON/ON SW</font></small></td>
      </tr>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R110-111-112=1 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C91-95-97-101-103-106-111-114=22pF</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">RL1=12V Relay 2X2 SW</font></small></td>
      </tr>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R115-118-120-123-127=10 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C92-93-98-99-104-105-109-110=47nF</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">JF10=Jack female stereo
        6.3mm</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R116-119-121-124-130=10 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C94-96-100-102=10uF 16V </font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">JF11....14=RCA female Jack </font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R128-131=27 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C107-108-113-116=470uF 25V</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">J11....14-17=3pin conn.
        2.54mm pin ste</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R129-132-137-138-140-146=100
        ohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">C112-115=47uF 16V</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">J16-17=4pin conn. 2.54mm pin
        step</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R133-135-139-145=100 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">IC11-12=<a
        href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>TL072</strong></a></font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">RV20=2X47 Kohms Lin. Slider
        [FADER]*</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R134-136=47 ohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">IC13-14=<a
        href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>NE5532</strong></a> - <a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>LM833</strong></a></font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">RV21=2X10 Kohms Log. Slider
        [FADER]*</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R141-147=10 ohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">D1-2-3=1N4002</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R142-148=4.7 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">D4-5-6=LED 3 or 5mm RED</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">*ALPS or PIHER type
        Potentiometer </font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R143-149=820 ohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">D7=1N4148</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">All the Resistors is 1/4W 1%
        metal film</font></small></td>
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        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">R144-150=47 Kohms</font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">Q1-3=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"><strong>BD139</strong></a></font></small></td>
        <td width="33%" bgcolor="#FFF0E1"><small><font face="Verdana">All the [nF] capacitors is
        63-100v 5% MKT</font></small></td>
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    <td width="100%"><p align="center"><img src="2ch_mixer_3.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/2ch_mixer/2ch_mixer_3.gif"
    width="642" height="980" alt="2ch_mixer_3.gif (22467 bytes)"></td>
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    <td width="100%"><font FACE="Verdana" SIZE="2"><p ALIGN="JUSTIFY">In the Fig.3 exist a
    classic supply circuit and stabilization of various voltages that needs the various
    circuits of mixer as +/-15V for the Audio department and + 12V for the RL1 and VU meter
    supplying. The regulators IC18-19-20 good it抯 they are placed on small heatsinks.
    Transformer T1 it抯 placed in a separate box, far from the remainder circuit, so that is
    not created problem of influence of rests circuits, from noise, unless it抯 toroidal. In
    the Fig.4 is found the indication circuit of level. This becomes with two classic circuits
    round the IC16-17 that drive the diodes Led D12