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28th January 2008, 02:23 AM
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#1 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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my pre instrument
the pre is design for interconnect a wide range of voltage levels.
it is based on opa2227.i do fast air wiring. pics below  zang |
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28th January 2008, 02:24 AM
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#2 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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details,
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28th January 2008, 02:28 AM
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#3 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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interconnected with my digital piano.
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28th January 2008, 05:33 AM
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#4 |
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diyAudio Member
Join Date: Nov 2007
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NICE!!
What amplifier do you use with it? I'm curious. 
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28th January 2008, 05:59 AM
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#5 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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i use Brian's lm4780nigc and my 3886igc
 zang |
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30th January 2008, 12:51 AM
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#7 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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the attached is a instruction of the air wiring connections.
i use a 23 steps shunt type pot.you can use standard stereo log pot. the file can print to A4 paper. zang |
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30th January 2008, 01:14 AM
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#8 |
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diyAudio Member
Join Date: Mar 2003
Location: BEIJING
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again,the attached zip pkg include home etch pdf files.feel free to work on it
the pcb layout is star ground concept,i recommend pcb beginner take a look.hope its useful zang |
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