USAFA: Audigy 4 (roommate's computer) ---> DIY GB-150D-based integrated amp (stereo configuration, remote-controlled, power-on delay for output, and heavily class-A biased (3.9mA/channel) LM4562NAs used in preamp section) ---> Yamaha NS-527 (modified with Vifa 6 1/2" woofers, Panasonic film caps in crossover, and heftier internal wiring)
Ghey-C'97 (my piece-o-crap issued laptop) ---> PPAv2 (class-A biased AD8620 (2.5mA/channel), 8600uF pre-regulator, LM338 high-current regulator, 40mA/channel output bias) ---> Grado SR-225 (yes, I bring my headphones home from the Academy during leave)
Here some pictures of my M3 headphone amp. I have used the normal parts from the BOM on the amb website. The headphone amp sounds great with my HD580 ! I have used an amplification of 5 (4k resistor) which is plenty for any PC and CD source with my HD580 to have a good range for the volume level pot. I have placed the transformer (I bought a normal pcb transformer from mouse instead of the fancy toroidal pcb version from digikey) in an old walwart housing from an old zip drive, because when it was next to the headphone amp pcb I had a little hum.
Before the amp was in a housing it had a little noise and hum, but now in his housing it is dead silent even with open volume (with nothing connected to the amp rca's). If you connect a dac you will hear the noise from the dac a little bit (NOS DAC).
USAFA: Audigy 4 (roommate's computer) ---> DIY GB-150D-based integrated amp (stereo configuration, remote-controlled, power-on delay for output, and heavily class-A biased (3.9mA/channel) LM4562NAs used in preamp section) ---> Yamaha NS-527 (modified with Vifa 6 1/2" woofers, Panasonic film caps in crossover, and heftier internal wiring)
Ghey-C'97 (my piece-o-crap issued laptop) ---> PPAv2 (class-A biased AD8620 (2.5mA/channel), 8600uF pre-regulator, LM338 high-current regulator, 40mA/channel output bias) ---> Grado SR-225 (yes, I bring my headphones home from the Academy during leave)
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Moon Audio modded Original CD-2008MK-II / de Almeida Signature Shadow XLR / McAlister Audio Massive Attack / Headphile modded BlackGold recabled AKG K340 OR APureSound V3 recabled Grado RS-1