I assembled it, turned it on and got a sound like a heartbeat. I have Beyerdynamic DT-990 Pro headphones with 250 ohm impedance. My high-end all-in-one audio DAC didn't have the power to drive them properly. They have about 5-8 dB less output than input and are horribly distorted. Is it possible to get a schematic to try and understand what is going on?
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