This is a description of a simple audio amplifier design. The IC used is the TEA2025B and it is applied in bridge-tied mode for single speaker application.
https://bestengineeringprojects.com/tone-control-circuit-active-and-passive/ https://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html https://www.circuitstoday.com/passive-tone-control-circuit https://learnabout-electronics.org/Amplifiers/amplifiers42.php
https://www.homemade-circuits.com/small-amplifier-circuit/ https://bestengineeringprojects.com/preamplifier-circuit/