The Tiny Audio Amplifier MODULE is a good choice for battery operation. It is based on LM386 IC, useful in various applications like robotics, science projects, intercom, FM radio and many more.
Specifications
- Power Supply 6V-9V
- 300mW Output @ 8Ohms Load
- On Board Potentiometer for Audio Level Adjust
- Header Connecter for Supply, Signal in and Speaker
- On Board Power LED
- Input: Standard Audio Signal
LM386 SMD Audio Amplifier Module – [Link]
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The low value of the 220uF output coupling capacitor attenuates bass sounds below 91Hz.