This pair of rock speakers has Bluetooth and a stereo amp built in, so installation is simple. It delivers a big, yard-filling sound, but it does require a power outlet. The OSD Audio BTR805 rock ...

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But that doesn’t mean there aren’t applications that leverage the “V” aspect, such as this nifty audio preamp using ... to see how it would fare as an amp. The circuit takes advantage ...

So when the throttle is opened all the way up the Propeller chip flashes some white LEDs in the headlights, and uses an LM386 audio amplifier to play a tune. When the throttle is pulled all the ...