MIDIbox Hardware Platform, SHX8 Module

This module is expired, as the NJU7304 chip isn't produced anymore!

The MBHP_SHX8 module expands MBHP_AOUT to up to 64 CV outputs. It consists of 8 Sample&Hold chips which multiplex the analog outputs of the MAX525. Please note that this module requires special support from the application which is not possible in all cases. Currently only the MIDIbox64 can drive the module, the worst case latency is 8 mS!

Download

PCB data, can be viewed, modified and converted with Eagle Light. The .pdf based schematic has been created with xcircuit. There are no special eagle schematics available, since components have been netlisted in the .brd file directly!
Module	Schematic	Layout Data	Quick-view
MBHP_SHX8_V1	mbhp_shx8.pdf	mbhp_shx8_v1.brd	mbhp_shx8_v1.gif

Additional informations
File	Size	Description
mbhp_shx8_orderlist.txt	1k	Mouser orderlist
mbhp_shx8_interconnections.pdf	9k	connection diagram for the SHX8 module

Pinning

Following projects support the MBHP_SHX8 module:

Application	SHX8:J1:SO	SHX8:J1:SC	SHX8:J1:RC
MIDIbox64	CORE:J10:RC (RC4)	CORE:J8:DO (RD0)	CORE:J14 (RD4)
MIDIbox64E	planned

Soldering Guide

	Start with soldering the 48 (!) bridges which save you from creating a 2-layer board. You can use the cutted legs of caps and resistors, before you throw them away after you finished all the modules! :-)
	Mount all parts with exception of the ICs and check the power supply voltages (see schematic. Thereafter put the ICs into the socket and measure the voltages again.
	Connect the PCB to the AOUT module and to your MIDIbox - the pinning depends on the application, see above. It's a good idea to start with the MIDIbox CV V1 application in order to test the module before using another application, since the usage is easier.

Note

In order to get the module running, you have to modify the MIDIbox64 setup. Open the main.asm and change following options:

#define DEFAULT_ENABLE_AOUT 1
#define DEFAULT_NUMBER_AOUTS 8
#define DEFAULT_ENABLE_AMUX 1
     

Thereafter rebuild the application like described here.

Latest News

Currently SmashTV (http://mbhp.coinoptech.com) creates an alternative layout with much less (or maybe without any) bridges!

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