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C3g Headphone design - will this work?

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Hi guys, just got around to finishing up my C3g design. Can you guys please check the design below and provide any of your insight. I have chosen battery bias, but also can do resistor or LED. The biggest question I have is with the batteries. I can just wire up two AA NiMH in series (once they are fully charged) and not have to worry about them ever again right? Basically, I am now doing this as a grid bias, or is it better to actually do a grid bias with the batteries, and therefore connect the cathode direct to the ground? This is where I am not 100% sure on. Ideas would be most welcomed.

Cheers and happy holidays.

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File Type: png C3g Schematic.png (55.0 KB)

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