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PJRC Store Main Board, $150 LCD & Pushbuttons, $42 LCD/Backlight/PB, $77 IDE Cable, $9 Complete Parts List MP3 Player Main Page Detailed Info User Photo Gallery Connecting The Board Firmware Download Side Projects Technical Docs Freq. Asked Questions FAQ #2 News And Updates

Connector Pinouts

The two pin connector next to the IDE ports is intended to allow the board to run from four AA size batteries. It can also accept a 5 volt power input.

A three pin connector is located close to the left line-level audio output. This connector allows an alternate 12 volt input, which is connected directly to the main power jack. The IDE Disable pin, when pulled low, requests that the board's IDE interface place all of its IDE signals into a high impedence mode (tri-state). Note, currently (13 Sep 2000) this feature is not implemented by the firmware.

The four pin connector near the right side of the SIMM socket is intended to allow a LCD display board to be connected. The transmit and receive are connected to the same UART as the serial port connector.

Config #1: AT/ATX Power Supply, Complete Board, Standard Drive

TODO: Diagram

TODO: Photo

Patrick Fischer sent a photo of his board mounted in a black 42cm case that matches other stereo components, available from from Thel (German site). The power supply provides power directly to the standard size hard drive, and the +5 volt line and group run to the 4.5-6 volt input on the MP3 player board.

MP3 Player Board Mounted in Enclosure, by Patrick Fischer

Config #2: ATX Power Supply, No Power Supply On-Board, Standard Drive

The red line (+5 volts) is attached to the positive side of the large 2200 µF capacitor on the right side. The black wire (ground) is connected to the negative size of this capacitor. The orange wire (+3.3 volts) is connected to the positive side of either of the 330 µF capacitors directly above the large capacitor.

TODO: Diagram

TODO: Photo

Config #3: Car or Home, Unregulated 12 Volts, Laptop Drive

Warning: the current firmware (13 sep 2000) operates the drive continuously, and the pre-regulator can become hot. Please check the temperature of the transistor on the right side of the board, to make sure that is is cooling adaquetely. Future firmware will use DRAM buffering and never operate the drive in a high power mode for more than several seconds.

TODO: Diagram

Config #4: Battery Power, External Recharge, Laptop Drive

TODO: Diagram

Config #5: Battery Power, On-Board Recharge, Laptop Drive