Mikroe Speaker Click contains an audio power amplifier with a high-quality audio reproduction. The board features the Maxim Integrated MAX9717 1.4W mono bridge-tied load (BTL) architecture audio power amplifier. It delivers 1.4W continuous power into a 4Ω load from a single +5V supply, or 350mW continuous power into an 8Ω load while operating from a single +3.3V supply. The MAX9717 has an adjustable gain amplifier and a headphone sense input that senses headphone connection to the device, muting the speaker while driving the headphone as a single-ended load.