sparkfun PRT-13144 Hook-Up Manual page 9

Page 9 of 14
Once both volume channels are connected, we'll need to provide power to
the Amp and the Touch Pot. Since the Touch Pot has a 5V LDO voltage
regulator, we can use the same power supply to power both the Amp and
the Touch Pot. A supply between the range of 9V-12V should be used to
power both. Power routed from the input can be seen in the image below.
Last, you'll need to connect some wires for audio in and audio out. This can
be achieved several different ways. The speakers can be attached directly
to the amp, or an audio output cable can be attached, as was the case in
our example. You can use an audio input cable on the input side. This
allows for phones, MP3 players and other 3.5mm jack-type devices to play
music through this setup.
With everything connected, apply power. You should see the Amp and the
Touch Pot power on. Connect a speaker and an audio source, play some
tunes and use the Touch Pot to control the volume!
Complete Audio setup.
You can read more about the analog output capabilities in the User Manual.
Example 3: Interfacing with
Microcontrollers
The first two examples showed how you can use the Touch Pot right out of
the box, no programming necessary. This example will show you how to
connect the Touch Pot to a microcontroller. It will also cover how to add
more than one Touch Pot to an I C bus. For an example of interfacing the 2
Touch Pot to a computer over serial, visit the User Manual