MIDIbox Hardware Platform
R4c CORE Module

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Live Board Map:

Move your mouse around over the image below to see info on the parts.

Parts List:

MBHP CORE_R4 Orderlist (last update: 06-2006)
| Loc.  | Description                        	| Qty   | Mouser Part #      |
| IC3   | Voltage Regulator 7805             	|     1 | 512-LM7805CT       |
| IC1   | IC-Socket for PIC                  	|     1 | 571-3902625        |
| IC2   | Optocoupler 6N138                  	|     1 | 782-6N138          |
| IC2   | IC-Socket for 6N138                	|     1 | 571-3902612        |
| T1    | Transistor BC337                   	|     1 | 512-BC33716TA      |
|R3,9-10| Resistor 10 kOhm                   	|     3 | 291-10K            |
| R5    | Resistor 5.6 kOhm                  	|     1 | 291-5.6K           |
| R6    | Resistor 1.2 kOhm                  	|     1 | 291-1.2K           |
| R2,4  | Resistor 1 kOhm                    	|     2 | 291-1K             |
|R7,8,11| Resistor 220 Ohm                   	|     3 | 291-220            |
| R1    | Resistor 100 Ohm                   	|     1 | 291-100            |
|C3,7,8 | Ceramic Cap 100nF=.1uF "104"       	|     3 | 80-C412C104K5R     |
| C6    | Ceramic Cap 330nF=.33uF (2.54LS) "334"|     1 | 80-C320C334M5U     |
| C1,2  | Ceramic Cap 33pF (2.54LS) "330"       |     2 | 140-50N2-330J      |
| C4    | Electrolytic Cap 10uF (5DIA-2LS)    	|     1 | 140-HTRL25V10-RC   |
| C5    | Electrolytic Cap 2200uF (13DIA-5LS)  	|     1 | 140-HTRL16V2200-RC |
| D1    | Diode 1N4148                       	|     1 | 78-1N4148          |
| BR1   | Bridge Rectifier                   	|     1 | 625-W08G           |
| P1,2  | TrimPot 10 k                       	|     2 | 531-PT6KV-10K      |
| Jxx   | 1-row SIL Headers (5 pins)        	|     1 | 517-6111TG         |
| Jxx   | 2-row DIL Headers (86 pins)        	|     2 | 517-6221TG         |
| Q1    | 10mhz 49S Crystal                  	|     1 | 73-XT49S1000-20    |
|J12,13 | 5 PIN DIN Jack PCB mount              |     2 | 161-0505           |
1.  The required PIC chip (IC1) is not included in this list, 18F452 is available
    blank or pre-programmed from mbhp.avishowtech.com or blank from other sources.
2.  The above pinheader counts are for recommended configuration, other loadings
    will change this count.  See the live board map above for the recommended
    connector placement.

PCBs and Kits are available: Click to order.

PCB Quick View:


# Location Detail Description                              
J1 Connection to the power supply. Either the output of a 7V-10V transformer, or a wall adapter can be used. 500 mA is recommented, especially if a backlit display is used, but MIDIfilter and MIDImerger work also with ca. 100 mA. AC or DC doesn't matter, since the rectifier behind J1 converts to DC anyhow. Also the polarity has not to be taken into account.
J2 +5V output, can be used to supply other core modules in a multiprocessor environment, so that you only have to mount the parts for the power supply (X1, IC3, C5, C6) on one core module. Restriction: the 7805 gets very hot when it delivers currents above 500 mA, so only core modules without backlit display like MIDIO128, MIDImerger, MIDIfilter should be supplied over this port.
J4 Interface to the BankStick for MIDIbox64 and MIDIbox16E. Interface to the second MIDI IN port for MIDImerger.
J5, J5A J5B This is an either-or setup. J5 matches the old (SIL) AIN connection. J5A and J5B match the with newer AIN boards (AIN_R3 up). Obviously with newer AIN boards leave out the SIL pinheader out and load J5A/B, if using older boards leave out J5A/B and load J5. Interface to the AIN module for MIDIbox64, and output ports for the MIDI clock signals of MIDIO128.
J6/J7 J6:Interface to the AIN module for MIDIbox64, and to the DIN module for MIDIbox16E (encoder inputs).
J7:Interface to the DOUT module of MIDIbox16E (LED rings output).
J8/J9 Pay attention to this one, it has moved since last rev....
J8:Interface to the DOUT module of MIDIbox64 and MIDIO128 (LED/digital outputs).
J9:Interface to the DIN module of MIDIbox64, MIDIbox16E and MIDIO128 (buttons/digital inputs).
J10 Pay attention to this one, it has moved since last rev....Do not mistake it for J8/J9 since they were in this position on the last rev!
J10:Interface to application specific module extensions like the SID module.
J11 MIDI digital IO port, interface to the LED/Thru/COM module. Can also be used to cascade multiple core modules in a long MIDI chain. Note: Don't plug the optocoupler (IC2, 6N138) into the socket when using the J11:MI (MIDI-IN) pin as an input, otherwise the Rx input will get the data from two different sources, which is not provided by the MIDI protocol (point-to-point). A MIDImerger is necessary to combine multiple MIDI IN sources. In other words: when using the COM module or when connecting the J11:MO of one core module to J11:MI of another core module, or when connecting the core module directly with the Gameport, the optocoupler of the other module should not be plugged into the socket to avoid a corrupted MIDI data stream.
J12 MIDI OUT port.
This is an either-or position, load SIL 3 pin header for wiring to panel mount MIDI jacks, otherwise install a PCB mount MIDI socket in/over the J12 pads.
J13 MIDI IN port.
This is an either-or position, load SIL 3 pin header for wiring to panel mount MIDI jacks, otherwise install a PCB mount MIDI socket in/over the J12 pads.
J14 Touch sensor input.
J15 Interface to LCD display module.
GND LIFT Can be used to temorarily disconnect the CORE's ground from the ground on J12:Pin2. Leave this alone for normal operation!

Resistor Placement:


Changes from R3 PCB:
Double sided PCB design.
Plated through holes.
Green LPI solder mask both sides.
HASL pad plating.
White topside legend silkscreen.
All jumpers eliminated.
Pads for MIDI I/O connectors on board.
Regulator moved to clear heatsink.
2x5 DIL pinheader footprint, pads and holes added to all connections.
Resistor footprint/pad spacing changed to 10mm.
Bypass caps added.
SID clock output added to connector J10.
J5a and J5b added (for 1:1 AIN_R3 connection)
Luma and Contrast pots changed to horizontal type.
Added "ground lift" trace.

For complete technical info and instructions see www.midibox.org

Last update: 06-30-2006 by SmashTV

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