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incredibly small stereo amplifier is surprisingly powerful - able to
deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the
miniature chip is a class D controller, able to run from 2.7V-5.5VDC.
Since the amp is a class D, its incredibly efficient (over 90% efficient
when driving an 8Ω speaker at over a Watt) - making it perfect for
portable and battery-powered projects. It has built in thermal and
over-current protection but we could barely tell it got hot. This board
is a welcome upgrade to basic "LM386" amps!
The inputs of the
amplifier go through 1.0uF capacitors, so they are fully 'differential' -
if you don't have differential outputs, simply tie the R- and L- to
ground. The outputs are "Bridge Tied" - that means they connect directly
to the outputs, no connection to ground. The output is a 360KHz square
wave PWM that is then 'averaged out' by the speaker coil - the high
frequencies are not heard. All the above means that you can't connect
the output into another amplifier, it should drive the speakers
directly.Comes with a fully assembled and tested breakout board
with 1.0uF input capacitors. We also include header to plug it into a
breadboard, 3.5mm screw-terminal blocks so you can easily attach/detach
your speakers, and a 2x4 header + jumper to change the amplifier gain on
the fly. You will be ready to rock in 15 minutes! Speakers are not included, use any 3ohm or greater impedance speakers.
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