📄 preamp_line_2_eng.htm
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<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small><strong>R1.....R10</strong>=47K
ohms</small></font></td>
<td width="33%" align="center" bgcolor="#FFF2EC"><p align="left"><small><font
face="Tahoma"><strong>TR1.....TR6</strong>=100K ohms Multiturn <a
href="variable_resistor.jpg" tppabs="http://users.otenet.gr/~athsam/ylika/variable_resistor.jpg" target="_blank">Trimmer</a></font></small></td>
<td width="34%" bgcolor="#FFF2EC"><small><font face="Tahoma"><strong>SF1......SF4</strong>=Jumper
Switch [See Text]</font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>R11-12-21-23=1M ohms</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Tahoma"><strong>RV1</strong>=2X10K
ohms Log. Pot. <a href="javascript:if(confirm('http://users.otenet.gr/~athsam/ylika/ALPS_pot.jpg \n\nThis file was not retrieved by Teleport Pro, because it is linked too far away from its Starting Address. If you increase the in-domain depth setting for the Starting Address, this file will be queued for retrieval. \n\nDo you want to open it from the server?'))window.location='http://users.otenet.gr/~athsam/ylika/ALPS_pot.jpg'" tppabs="http://users.otenet.gr/~athsam/ylika/ALPS_pot.jpg" target="_blank">[ALPS-NOBLE]</a></font></small></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small><strong>J1.....J14</strong>=RCA
Type Female gold-plated plug</small></font></td>
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<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>R13-17=470K ohms</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small><strong>C1......C12</strong>=100nF
100V MKP 5%</small></font></td>
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<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>R14-18-22-24=100 ohms</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small><strong>IC1-2</strong>=OPA604-OPA627-NE5534
[See Text]</small></font></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Tahoma">R15-19=12K ohms [See
Text]</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>IC3-4=OPA604-OPA627-OPA637-NE5534
[See Text]</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>All Registors is 1/4W 1%
Metal film</small></font></td>
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<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>R16-20=1.8K ohms</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>IC5-6=OPA604-OPA627-NE5534
[See Text]</small></font></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Tahoma"><small>For ICs Techical Data see my<strong>
<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm">Database</a></strong></small></font></td>
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<td width="33%" bgcolor="#800000"><p align="center"><font face="Tahoma" color="#FFFF00"><small><strong>Input
Selector and Delay Time [Fig.1B]</strong></small></font></td>
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<td width="100%" height="313"><p align="center"><img
src="preamp_2b.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/preamp_line_2/preamp_2b.gif" width="978" height="331"
alt="preamp_2b.gif (14318 bytes)"></td>
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<td width="100%" height="8"><b><span lang="EN-US"
style="font-size:10.0pt;font-family:
Tahoma;mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;
mso-fareast-language:EL;mso-bidi-language:AR-SA">Input
Selector -Delay output connection [Fig 1B]<span style="mso-spacerun: yes"> </span></span></b></td>
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<td width="100%" height="2"><span lang="EN-US"
style="font-size:10.0pt;font-family:
Tahoma;mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;
mso-fareast-language:EL;mso-bidi-language:AR-SA"><font
face="Tahoma">Here exists the circuit of inputs choice relays from the S1, Tape monitor
from the S2, MUTE from the S3 and the delay output connection circuit [IC7A-B]. With the
S1A supply with + 12V [+ VD] the corresponding relay. Simultaneously turns on also the
corresponding Led D1匘4, so that we know who entry we selected. In the same simple
operation is supported also the choice Tape monitor. When we supply the preamplifier with
supply, the +VDD supplies IC7A his exit becomes High, via the R28 charge capacitor C13,
after 5 seconds the exit of<span style="mso-spacerun:
yes"> </span>IC7B
becomes<span style="mso-spacerun: yes"> </span>High, the<span
style="mso-spacerun: yes"> </span>Q1 closes also the<span style="mso-spacerun: yes">
</span>RL6 arm. If you want to change this time it will be supposed you change the
value of C13 with different from the one that I give in the part. To it抯 the circuit
simplest operation MUTE becomes with the S3 as follows. In the normal place the S3 is
closed. When select operation MUTE the switch open is interrupted the supply to the RL6
which the contacts open so that is interrupted the flow of signal to the preamplifier
exit. Simultaneously turns on the D7 Led, showing MUTE operation. Closing again the S3 the
supply is restored immediately and the contacts of RL6 closes, whenever the acoustic
signal drive again the power amplifiers. As you observe the second contacts team of S1
they are jump and via these becomes the supply of + 12V in the S3. This ensures that each
time the S1 rotary switch moved by a place in the other exist small time supply pause of
RL6 with +12V [+VD]. Thus each time where it become the choice of some input, the exit of
preamplifier is interrupted with result likely noises, are not listen.</font></span></td>
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<td width="33%" bgcolor="#800000"><p align="center"><font face="Tahoma" color="#FFFF00"><small><strong>Part
List Sel. and Delay [Fig.1B]</strong></small></font></td>
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<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>R28</strong>=1M ohms</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>C14=100nF 100V MKT 5%</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>RL1.....RL6</strong>=<a
href="small_relay.jpg" tppabs="http://users.otenet.gr/~athsam/ylika/small_relay.jpg" target="_blank">Relay 12V</a> [See Text]</small></font></td>
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<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>R25-26-30=1K ohms</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>IC7</strong>=4081
c-mos</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>S1</strong>=6 stepX2
contact Rotary Switch [See Text]</small></font></td>
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<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>R27=10K ohms</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>D1.....D5-7</strong>=Red
Led 3mm </small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>S2-3=<a
href="small_switch.jpg" tppabs="http://users.otenet.gr/~athsam/ylika/small_switch.jpg" target="_blank">1X2 step mini switch</a></small></font></td>
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<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>R29=39K ohms</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small>D6=1N4148</small></font></td>
<td width="34%" bgcolor="#FFEEE6"><font face="Tahoma"><small>All Registors is 1/4W 1%
Metal film</small></font></td>
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<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>C13</strong>=4.7uF
25V</small></font></td>
<td width="33%" bgcolor="#FFEEE6"><font face="Tahoma"><small><strong>Q1</strong>=BD678</small></font></td>
<td width="34%" bgcolor="#FFEEE6"><font face="Tahoma"><small>For ICs Techical Data see my<strong>
<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm">Database</a></strong></small></font></td>
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<td width="33%" bgcolor="#800000"><p align="center"><font face="Tahoma" color="#FFFF00"><strong><small>Power
Supply</small> <small>[Fig.2]</small></strong></font></td>
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