Backbird SR-71A Headphone AMP CLONE
With rechargeable 9V battery X2
ALREADY ASSEMBLED with ENCLOSURE
size is 125mm X 70mm X 35mm
Recommended input voltage for charging: DC 9V~16V
OPAMP used : AD797 + DUF634
Come with 2pcs of low self discharge Ni-MH 9V
battery(not in the photo).
You can charge the batteries inside the enclosure without taking it out.
Selectable gain(10dB, 2dB) for difference headphone.