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dorkvader
199
Oct 15, 2013
looking at the PCB, there aren't enough components to implement much more than the standard implementation with battery charging,
I'm looking at TI's datasheet for the DRV601 opamp this uses and we can determine a few things. 1. THD+N is lowest at about 500mV to 1V depending on the battery charge 2. the corner freq of the opamp appears to be roughly 70 Hz (rolloff starts at about 100) 3. Acceptable gain values for the opamp are 1-10 4. The minimum load impedance is 100 ohms, so they might have something to increase the rload
Then again, for anything less than 100 ohms, amplification is completely unnecessary. 5. relatively low psrr of 88 db is ok since it's battery powered. 6. no word on the current output into load. I don't think this will work with low-sensitivity headphones at all.
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