"Does anyone know good DIY versions of this inline preamp? A schematic with high quality components would be excellent. Like what is a transparent op amp\/jfet and what capacitors are good to use. I found one cheap (around 10 dollars) product that shows the schematic but I am not sure of the quality:\n \n[url=http:\/\/www.designnotes.com\/Merchant2\/merchant.mvc?Screen=PROD&Product_Code=K1803&Category_Code=auha]Velleman UNIVERSAL MONO PREAMPLIFIER KIT: Designnotes.com[\/url]\n \nBest Regards"