Audio amp (speaker driver): L'ilBoard3.09.
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Audio amp (speaker driver) Li'lBoard page.

Model number: LB3.09.

Description: A single channel 5W max amplifier.

Features:
•Can be used with an external voltage source to control the volume.
•Alternatively, the volume can be controlled using the on-board trim-pot.

Key components: TDA7056B, a 5 W Bridge Tied Load amplifier.

Restrictions: The speaker must have both leads floating with respect to ground, i.e. they must both be connected to the amplifier's output terminals and nothing else.

Images:

Schematic:

Click on image for full (PDF) schematic

Vin max: 18

Vin min: 2.7

Link to the previous board (SPI DAC)

Link to the next board (HC908QB/QC)