Audio amplifier module LM386 IC. Audio signal and 5-12VDC in; approx. 2 watts out to a speaker. Cheaper than building your own.
LM386 Audio Amplifier Module 20 Times 5V-12V Input 10K. Approx $4.00 on eBay.
LM386 Audio Amplifier Module
![lm386 amplifier (amp-11v11)](http://ham.aditl.com/wp-content/uploads/2012/09/AMP-11V11-lm-386-150.jpg)
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