4 x IIC PCB for SEQ

[ilmenator]

Up in this thread it was suggested to move the circuitry around the four ICs a little (1cm?) to the right, in order to save on board space on the left - is this still an option? To my eye, this should fit nicely. Also, you should then adjust the lower left mounting hole (the one near LED1) a little upwards, so that it is in line with the lower right one (you might want to do this regardless).

[Altitude]

Up in this thread it was suggested to move the circuitry around the four ICs a little (1cm?) to the right, in order to save on board space on the left - is this still an option? To my eye, this should fit nicely. Also, you should then adjust the lower left mounting hole (the one near LED1) a little upwards, so that it is in line with the lower right one (you might want to do this regardless).

Done and done. The lower mounting holes have the same spacing relative to the connector side as the core32 for consistency(the lower right was off on the last rev), the top ones are different obviously since the board is not as deep.

The second file is the 24 isolated version with jumpers for easier etching..

Also, the 8 pin DIN is available in the US at digikey: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=CP-2380-ND

Edited September 10, 2010 by Altitude

[sineSurfer]

mmm, this leaves out my spare 7 pin DIN sockets

8 pin DIN on mouser: 161-0507-E or 161-0508-E

btw. looks like 8 wire cables are not that common?

maybe this: 17HR618 + this: 172-0008 (again, from mouser)

nice work Alt ;)

Edited September 10, 2010 by sineSurfer

[Altitude]

That mouser part is fine, I add added the extra pads for both the 5 and 8 pin connectors so ppl can use ones with either the 5mm or 10mm spaced pins in front. Like that pre-terminated 8 pin DIN cable though, might actually not be a bad idea just to terminate the wires that directly to the BLM instead of using the big DIN connector and save some space..

Edited September 10, 2010 by Altitude

[TK.]

I'm just soldering my prototype BLM socket and noticed two things: some pins are swapped in your layout, and the footprint doesn't match with the socket available at Reichelt.

More input soon.

Best Regards, Thorsten.

[TK.]

Attached you will find the pictures of a "certified circuit" ;)

Ignore that I'm only using a 4-pin header, and ignore that +/- are swapped compared to the MBHP_CORE::J11 port

Best Regards, Thorsten.

[Altitude]

Ok, kinda hard to trace those pics so here is the schem I used for mine, maybe it will be easier to spot the problem there.

As far as I can tell, pins 1 and 3 and 7 and 8 are swapped in your PCB layout but are shown the other way around in the schematic you posted. Can you confirm?

Also, regarding the footprint, either should work. I ran into that type connector with my last GM5, it is different since it does not have the click-in tabs but will fit the same footprint. I'll make sure to leave more room though since the extra plastic around the pins needs more clearance

This the DIN8 available here btw: http://products.cui.com/getPDF.aspx?filename=SDS-80J.pdf, the pins are numbered differently than the Hisrchmann part in eagle but everything else matches

Edited September 23, 2010 by Altitude

[Altitude]

Ok, board revised for the Kobiconn connector available at mouser and reichelt. These are different from the hirshmann and CUI parts. Please see first post

Edited September 27, 2010 by Altitude

[TK.]

Pin 5 and 4 (MIDI OUT) are swapped

Best Regards, Thorsten.

[Altitude]

Pin 5 and 4 (MIDI OUT) are swapped

Best Regards, Thorsten.

fixed. Forgot to change pins on the symbol..

Edited September 27, 2010 by Altitude

[TK.]

It looks better now - the remaining risk is at your side! ;)

Just a last proposal: you could prepare a "dummy DIN5 socket" between the 4th MIDI OUT and the BLM socket.

This would be helpful for the case that somebody doesn't want to connect a BLM, but wants to add a third MIDI IN/OUT provided by the MBHP_CORE_STM32 module.

In this case he would need two DIN5 sockets.

The MIDI OUT could be soldered at BLM location, the MIDI IN at the "dummy" location.

You don't need to add connections to the "dummy" port - if somebody wants to use it, he could connect MIDI IN pins via two cables.

Best Regards, Thorsten.

[Altitude]

Slick, i'll add it.

[Altitude]

Ok, Dummy midi plug added.

[TK.]

Thank you!

No objections anymore! :)

Best Regards, Thorsten.

[grexA_178]

I remember that i was trying to do this, but mine looks different and its not prooved.

If somebody interested look at attachments.

IIC MIDI.rar

[ilmenator]

If somebody interested look at attachments.

I did not look closely, but some of the resistors seem to have a very small footprint...

[nILS]

Yep some are 0204, which is rather uncommon. Also the crystals don't seem to be standard HC49.

[gtxdude]

Altitude, Are there any plans to make a few of the 4 X IIC PCB's for the SEQ? If not, could you make the design file available so that i could have one made for myself?

Many thanks!

[Altitude]

Since the case is hold right now, my seq work has been bumped to the end of the queue but, yes, I do plan on running some boards next time I am making circuit boards (this month for sure).

[gtxdude]

Altitude,

Bump #2 on the 4 X IIC PCB's for the SEQ. Any closer?

Many thanks,

gtxdude

[Altitude]

I've pretty much shelved this pending the case. I did attempt a run of boards however, for whatever reason I had a batch of ultra thick copper boards when combined with my old developer resulted in a big mess with no good boards.

[latigid on]

For anybody following, be careful on the pinout for the DIN8 socket. The 1-4-3 layout originally suggested is much more common now and Mouser's datasheet for 806-KCDX-8S-S2-PS is (at this time) incorrectly shown as 2-3-2 3-2-3. 

 

RS #491-049 looks okay, one has to buy 5 at least where I'm looking.

 

It seems that Reichelt no longer stock DIN8 PCB mount...

Edited July 9, 2015 by latigid on

[Altitude]

holy zombie thread (last post was 4 years ago). Everything has been long sorted on this and smash has boards

Edited July 8, 2015 by Altitude

[latigid on]

Sure, but is there another relevant thread for the quad IIC? I just wish you'd stuck with the original footprint :). Personally I've already bought the wrong part several times; I think RS might have also 'replaced' their 3-2-3 with a 1-4-3. In any case it would be good if any future PCB runs could have a dual footprint.

Edited July 9, 2015 by latigid on

[Shuriken]

How 'relevant' is the quad IIC at this point in time? I thought it was pretty much replaced by the Midi IO module.