PJRC High Capacity MP3 Player Circuit Board
This project is a stand alone MP3 player, designed for home, car,
or portable use. It plays a group of MP3 files stored on a
standard or laptop IDE hard disk drive... hundreds of hours
using even today's low-cost drives. The firmware is available
under the GPL, for anyone who want to really customize the player.
High quality audio
output is provided by a 24 bit DAC, using both standard
line-level outputs and an amplified headphone output.
The large capacity allows the
use of very high MP3 quality settings, that would reduce flash based
players to only a few songs. Because it's a complete stand
alone player usable in a variety of applications, you can have
your entire MP3 music collection anywhere away from your computer.
Update, February 2009: This mp3 player
board is no longer available.
A few displays and spare parts may be still purchased
while stock remains. This project began long before Apple sold
their first generation ipod and was available with boards in stock
for nearly 9 years, but sadly we just can not continue it forever.
These old web pages will remain online for
reference and historical purposes.
PJRC.COM is currently offering five types of items:
Some special items are also available from third parties:
- Fully Assembled and
Tested Circuit Boards, which
provide the "guts" of a player, all that is needed is to add a
hard drive, memory SIMM, and a power source.
With an assembled board, the only electronics experience necessary
is some familiarity with connecting PC computer parts, the
IDE disk drive, a memory SIMM, and a power supply.
- Display, 24 Character by 8 Line LCD.
This large screen connects to the MP3 player's 4-pin port. An
adaptor board provides 12 pushbuttons which duplicate the functionality
of the board's buttons and also provide additional features.
- Complete Kits
and Partial Kits,
which you can build instead of
buying the board assembled. The kits require
electronic assembly experience (soldering)
with through-hole and low density surface mount electronic components.
- Short IDE Laptop Cables
and 72 Pin SIMMs (used), which are often
not available from normal computer supply vendors.
- Individual ICs. These are intended for
engineers and hobbyists
who wish to make substantial changes to the design or design their
own player from the ground up.
There is a
group for this project at Yahoo Groups. This
is a good place to post general questions and talk with other
users. Thanks to Russ for setting this up.
Old MP3 Player Design
The old design is still on-line at
this page. The old player was
a very simple and limited design, based on the
purpose 8051 development board. We briefly sold ICs that
were used in the older design, but a finished circuit board was
never made... only point-to-point wiring. The old design will
remain on-line, mostly for historical reference.