If you want to get some sound out of your project but have a tight space budget, this is a good way to do it. This 0.25W, 8Ohm speaker is only 40mm in diameter and just over 4mm thick, the same kind you might find in one of those "talking greeting cards".
Pololu 12V Step-Up Voltage Regulator U3V12F12
The compact (0.32"×0.515") U3V12F12 switching step-up (or boost) voltage regulator takes an input voltage as low as 2.5 V and efficiently boosts it to 12V.
Mono Audio Amp Breakout - TPA2005D1
This tiny audio amplifier is based on the Texas Instruments TPA2005D1. It can drive an 8-Ohm speaker at up to 1.4 Watts; it won’t shake a stadium, but it will provide plenty of volume for your audio projects.
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