HeadBanger Headphone Amp Construction Kit

You can build a high-quality portable amplifier to boost the output of Sony MiniDisc portables. After the euphoria over receiving my new Sony Minidisc bundle had partially subsided, I noticed that the portable unit, the MZ-E40, has a rather weak output. Measurements showed that it can only manage 80mV rms output and only about 74dB SPL output from the phones.