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MP3 Player, $150
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MP3 Player
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MIDI Drum Machine
CCD Array Reader
Printed Circuit Boards
Audio Power Amp
Filter ASIC
OSU8 Microprocessor
Xilinx Downloader

Project List

Teensy and Teensy++ Projects.

These are projects that I've worked on over the years. I hope you'll find some of these web pages useful.

  • MP3 Player With IDE Hard Drive
    Forget about tiny flash memory, a full-sized hard drive is the only way to go! Here's my the new MP3 player board that reads standard FAT32 formatted hard drives, is designed to support a large DRAM buffer and to run from batteries, and is flash firmware upgradable.
  • 8051 Microcontroller Goodies (free stuff)
    The 8051 microcontroller family offers a very flexible and easy-to-use architecture which is still very popular, despite newer, much more "powerful" processors. Here are some of my tools, projects and bits of 8051 code which you may find useful.
  • The MIDI Drum Machine
    The MIDI Drum Machine, designed and constructed in the Fall of 1991, was my first major 8051 based project. With some help from a musician, it turned out to be a very successful project, as you'll be able to see.
  • HUB ISP
    Programming an AVR chip with ISP using USB only, without any preprogrammed or special chips, only simple logic gates and resistors, and a USB hub.
  • Interactive Disk Spin
    Spin the disk drive platter and see how fast you can make it go. A whimsical gadget which now lives at Freegeek.
  • CCD Array Reader
    A circuit which interfaces a linear 128 pixel optical CCD Array detector to the parallel port of a computer. It features high-speed operation, automatic level corrections and gain control, and generally it works quite well.
  • Making Printed Circuit Boards
    I etch printed circuit boards, using low-cost chemicals and equipment. Here's a guided tour of the process.
  • Audio Amplifier Design for the OSU IEEE CBW
    The amplifier design used by OSU's IEEE student chapter for the circuit board workshop.
  • Fourth Order Low-Pass Filter IC
    This full-custom VLSI IC was my first VLSI design. 6071 transistors are packed into a 2.2mm die fabricated in a 2 micron CMOS process. After resolving a communication problem with mosis, the final silicon actually worked!
  • OSU-8 Instructional Microprocessor
    A complete microprocessor, designed from the ground up, from instruction and register specification, to simulator/assembler, datapath and control. Xilinx implementation, that ran some code.
  • Xilinx Programming
    A simple downloader for the xilinx 4000 series which costs quite a lot less than the xilinx xchecker product... the design is freely distributed.
  • USA Map for Elementary school
    A simple project to make teaching the names of our 50 states to elementary school kids more fun.
  • IC Pinout Index
    An experimental project to try storing an index of integrated circuit pinouts in a web accessible form. Not very useful (yet, if ever), but some nifty cgi code.


Paul's Technical Projects List, Paul Stoffregen
http://www.pjrc.com/tech/index.html
Last updated: February 24, 2005
Suggestions, comments, criticisms?? <paul@pjrc.com>