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INTRODUCTION
The UAM2 is a small, high quality audio amplifier that you can plug any line
level source into and get a whopping 20W out! So if you want, you can plug
your portable cd player in and run your big ol' speaker! The board is made so
that you can mount it directly onto the back of a speaker or just use it as is
with the mounting holes. It puts out great quality sound with lots of power and
the active parts are all surface mount! You'll be amazed when you fire it up,
20W is going through a tiny TSSOP IC, and it doesn't even get warm. There
are 4 gain settings giving you a rough volume adjust, and also a shutdown
input so you can turn the UAM2 off without disconnecting the power.
UAM2 CIRCUIT DESCRIPTION
The UAM2 is built around the Texas Instruments TPA3001D1 audio
amplifier. It is a 20W audio amp in a 24 pin TSSOP package that we have
soldered onto the board for you. We know that many of our customers have
super skills, but we soldered it on for the sake of the ones that might have a
hard time with a small part like that. All the other parts are left for you to
solder, and if you have some surface mount experience it should be really
easy. If this is your first kit, it may be a little challenging, but if you work
slowly and carefully it should come out all right. The TPA3001D1 is a class D
audio amplifier. The "D" is the magic behind how a tiny chip can handle 20W
without going "poof". If you already know how a class D amplifier works, you
may skip this section. If, however, this is your first exposure to class D amps
as it was for me when I designed this kit, keep reading and allow me to
enlighten you.
audio input
reference signal
outp
outn
comparator and
switch
differential
output
UAM2• 4
filter
output to speaker
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