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GM5: Least-cost USB-MIDI Interface Chip for 4.50 EUR


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Nope, mearly asking if there's an estimated time...

As in are we looking at a few weeks or a few months. TK if you did happen to take that as badgering I appologise. I know that you're doing all this to only further the community, not your own wealth and it's very much appreciated, so I would never go out of my way to badger you or anybody on this forum and hope it wasn't taken that way...

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I got the chips and PCBs today, PMs to people in the waiting list are sent out.

gm5_bulk3.jpg

I've more than enough chips and PCBs in stock.

If you are interested to buy some, just follow the instructions explained in the Wiki:

http://www.midibox.org/dokuwiki/doku.php?id=tk_gm5_bulkorder

Best Regards, Thorsten.

P.S.: following users in the previous waiting list are unknown:

Unable to find member 'the antagonist'.

Unable to find member 'igor'.

Unable to find member 'sid'.

Unable to find member 'schlalek'.

Unable to find member 'beshanoe'.

I wasn't able to inform you via PM!

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Will be shipped tomorrow:

fussylizard

rosch

audio-mobster

xaoe

morganphalen

Janis1279

Tamiflu

meToo

listen202

Protosx

Flexinoodle

Lorcan

zemika

bluescreen

niietzshe

benuron

Shortplay

kc

Pivado

cokrax

Best Regards, Thorsten.

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There are (more or less) bad news, but also good news:

The PCB fab delivered the old v1_1 layout by mistake. It has no J8 jumper (1) and no ground rings around the USB socket (2).

Both are minor improvements, the v1_1 board will work perfectly.

(1) requires to solder a cable from pin IO5 (#10) to ground if your interface should be named "midibox.org" instead of "ploytec". The GM5 will work perfectly as "ploytec" device, so that this cable is really optional.

(2) has only been added for mechanical robustness reasons. Your board will work without changes, but if you want to improve it, just follow TheProf's instructions

The good news: Ploytec is very sorry for this mistake, and the Fab will send us 100 v1_2 PCBs for free! The PCBs will be available in some weeks.

  • If I already sent you a v1_1 board, and you want a replacement (for whatever reason), just contact me and I will send you the new ones (once available). Shipping will be free
  • People who haven't got their order yet, will be asked if they prefer v1_1 or v1_2 (as mentioned above: it will take some additional weeks until the PCBs will be available)
  • I will sell the remaining free v1_2 boards to cover the additional shipping costs, and the rest of the extra money as a donation to finance my upcoming MIDIbox projects.

Best Regards, Thorsten.

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Can I replace the 6n138 by the 6n139?

From a Pic based Core article:

"Every MIDI device comes with such an optocoupler which isolates the MIDI Input from the device on the other side, just to avoid any damage.

For the case that you don't find a 6N138, you can also use a 6N139 (it's pin compatible)."

And the c3 1uF ceramic capacitor by one 1uF film capacitor?

Yes , it's a good replacement.

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From a Pic based Core article:

"Every MIDI device comes with such an optocoupler which isolates the MIDI Input from the device on the other side, just to avoid any damage.

For the case that you don't find a 6N138, you can also use a 6N139 (it's pin compatible)."

Yes , it's a good replacement.

Ohhh thanks!

I don't understand nothing about the technical stuff, only following schematics and soldering! :)

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This time it took a bit longer due to vacation...

Shipped today:

strogon14

ezChris

papapoulp

JustPhil

thedishmop

Lumstar

sneakthief

freddy

matoz

lead bromide

Will be shipped once I got the v1.2 boards:

mattflo

Xem

m00dawg

afx

cinhcet (Waiting for money)

roger (Waiting for money)

Waiting for the money:

diggi

jbaldwinroberts

Morten

Best Regards, Thorsten.

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I got the v1.2 PCBs from Ploytec, and prefer to ship these ones in future.

The v1.1 PCBs will be held back as spares for the next bulk order (e.g. if more than 100 PCBs are requested)

Following orders will be shipped tomorrow:

diggi

cinhcet

mattflo

Xem

m00dawg

afx

insectteam

Bordes Sébastien

horkheimer

Best Regards, Thorsten.

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