WebApr 11, 2024 · Bennybuis. Post subject: Re: PreAmp Schematic. Posted: 27 Apr 2010 10:13 pm. Joined: 28 Oct 2009 8:34 am. Posts: 501. Location: Utrecht Nederland. Hi John, the gain from this schematic is probably about 20, but you can adjust that within borders with the cathode cap, somewhere between 7 (no cap) and 20 (100uF cap or bigger) and a poti, of … WebStep 3: Stereo Audio Amplifier Module. Audio output directly from the bluetooth module capacity is too small, so I decided to use a power amplifier module for powerful output signal provides speakers and headphones. PAM8403 module meet my requirements, this module has a compact size, 3W output for both Left and Right 2 lines.
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