| Availability | 34 in stock |
| Store | Qty | Aisle |
|---|---|---|
| Warehouse | 34 |
A mini class D with AGC and I2C control? Yes please! This
incredibly small stereo amplifier is surprisingly powerful. It is able
to deliver 2 x 2.8W channels into 4 ohm impedance speakers (@ 10% THD)
and it has a i2c control interface as well as an AGC (automatic gain
control) system to keep your audio from clipping or distorting.
If
you don't want to use I2C to control it, it does start up on with 6dB
gain by default and the AGC set up for most music playing. We do suggest
using it with a microcontroller to configure it, however, since its
quite powerful. Settings are not stored in the chip, so you'll need to
adjust any gain & AGC amplification settings every time the amp is
powered up.
Inside the miniature chip is a class D controller,
able to run from 2.7V-5.5VDC. Since the amp is a class D, it's
incredibly efficient (89% efficient when driving an 8Ω speaker at 1.5
Watt) - making it perfect for portable and battery-powered projects. It
has built in thermal and over-current protection but we could barely
tell if 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 ~300KHz 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 3.5mm screw-terminal blocks so you can easily attach/detach your speakers, and some header in case you want to plug it into a breadboard. Speakers are not included, use any 4 ohm or 8 ohm impedance speakers.
