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Balanced Microphone Preamplifier PCB pattern (PDF download) 
PDF with the PCB design for the Balanced Mic Preamp for PCs & MP3 Players (single-sided).
Cat No SC1347. Price: AUD $3.00
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Project: Balanced Mic Preamp For PCs & MP3 Players
Other item relevant for this project:
Balanced Microphone Preamp front panel artwork (PDF download)
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