Diamond Buffer Headphone Amp. Ended up using 12R 220R for 12ma bias through outputs. Beresford Caiman Mk II DACheadphone amp Little Dot CDP ii CD transportMatrix Quattro amp La Figaro 336C SET tube headphone ampThe Kings.
You can also use it for driving headphones. It also provides a low source impedance for the transformer. A group buy has been started at Headwize for the diamond buffer module discussed in the forums.
The schematic is two non inverting stages with a diamond buffer inside the feedback loop of the second stage.
The design has full complementary input by J-FETs following by diamond buffer to boost the current to give a powerful and vivid sound. What really counts is the PCB layout which is meticulously designed and the hefty for a headphone amp PSU as far as capacitance and transformer power rating is concerned. With only four transistors and four resistors the diamond buffer does not require much. This buffer can be used in a preamp as line stage without gain as a buffer for DACs and CD-players.
