TK.

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

733 posts in this topic

Chips and boards arrived safely today - Man, those are some small pins. Looks like it's time to practice my SMD technique on some old RAM...

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put my name down for 1 on the next go...

edit new total is 2 chips 1 board

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I've still 8 GM5 chips in stock from people who haven't paid yet (4 weeks after first notification, 1 week after deadline...)

So - this is your chance to get the remaining ones, the quantity doesn't matter - 1, 2, ... 8.

I've also more than 100 small PCBs in stock - let me know if you are interested as well (the rest will be sold during the next bulk order).

Just PM me the desired quantity - NOW! - first come, first serve!

SOLD OUT!

Best Regards, Thorsten.

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TK: Many thanks for the GM5 ! I just finished the 2nd Unit (besides small problems initially on the +5v) and all is working now.

Now it's time to look at the port extension (on protoboard).

--jan

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hi, i paid 

Nov. 13, 2008 Payment To Thorsten Klose Completed Details   -€13.65 EUR  €0.00 EUR  -€13.65 EUR

#05362820XB5106219

is it ok the package not showing up yet? I also miss invoice for the 5x5 -.-

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According to my records, I sent you the small parcel on 21th november, more than one month ago.

If you don't get it in the next 3 weeks, please write me a PM and we will try to solve this

Best Regards, Thorsten.

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looks like a cool project.  :D Just added 4 to the wiki pg.

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I'm also on this list. I'm assuming we will be contacted for paypal payment when the minimum is reached and this will communicate the address?

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hi, i did just add one gm5 and one pcb :-)

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Hi,

question to all: did anybody already test the part under full load on all MIDI channels at the same time? If yes, did it work properly? I have currently an issue with this GM5 in a customer specific equipment, and under some strange circumstances it hangs up from time to time -- communication on USB and also sometimes on the MIDI ports stops. Only Power-Down/Up solves it.

Cheers,

Skunk

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Okay.  I've requested 5 x GM5 + 5 x PCB's and I've updated the wiki.

Thanks.

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Hi Skunk,

question to all: did anybody already test the part under full load on all MIDI channels at the same time? If yes, did it work properly? I have currently an issue with this GM5 in a customer specific equipment, and under some strange circumstances it hangs up from time to time -- communication on USB and also sometimes on the MIDI ports stops. Only Power-Down/Up solves it.

which computer, which operating system, which driver, which HW variant?

I recently had similar issues on my Mac with one of my GM5 modules which is connected to a passive 4x1 USB hub. After some troubleshooting it turned out, that the power consumption on the hub was too high (e.g. a MBHP_CORE_STM32 module + a MBSEQ Frontpanel with backlit LCDs was connected as well).

I solved this by using an active hub with dedicated power supply.

The strange thing was: the MBHP_CORE_STM32 module was still working pretty stable - so it seems, that the Atmel chip is less tolerant against voltage drops, but I haven't checked this further (as I found a stable solution...)

Best Regards, Thorsten.

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4 chips 2 pcbs added to wiki.  Thanks.

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Hi Thorsten,

which computer?            an AMD motherboard with 2.4GHz Athlon (don't know the supplier)

which operating system?  WinXP SP2

which driver?                  Ploytek special, customer specific

which HW variant?          customer specific -- a special board connected via the

                                  GM5 to the motherboard and a second USB-to-Audio

                                  USB I/F with 480Mbit, also connected to the motherboard.

                                  If the 480MBit line fails, the 12MBit USB-to-MIDI line also fails

                                  sometimes

In the meantime we found one possible problem for the failure: groundbouncing. During the initialization of the USB controller on the motherboard, looking for devices, a groundbounce shuts the device recognition down (it looks like that, but this is not yet proven). There seems to be no means in the GM -- only reset.

Cheers,

Andreas

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well, this is a very nice project :) 2 chips + 2 pcbs added to wiki.

Thanks.

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Hi Skunk,

Your manufacturer is probably Dell. I have exactly the same problem. But only with the AMD Athlon board (as well with the 3800+ as the 5400+), not with the Intel (Also Dell).

The USB freezes after intensive use. I think it's a heat problem, but have not looked more into it. Under normal use the USB is fine. Put it under load and it hangs.

If it is still possible to order, I would like 2 Chips with 2 PCB's.

Gioxannes.

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I ordered 250 GM5 chips yesterday.

Best Regards, Thorsten.

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Yay  :D

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Ploytec was well prepared - I already got the chips.

PMs are sent out

Note that currently there are at least 20 spare parts - first come, first serve!

Best Regards, Thorsten.

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This is so weird.

You can get a MIDI-USB-Interface with 5 I/Os for just about 15€!

I mean, search for MIDI-Interfaces at thomann for example and compare the prices.

Can anybody tell me why that is like that?

:P

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I mean, search for MIDI-Interfaces at thomann for example and compare the prices.

...and compare it with the Blacklist

Most low-cost interfaces provided by Thomann are working unreliable.

Today you can buy an USB based Multi Purpose card reader for less than 5 EUR, but usable MIDI interfaces are still so expensive like 10 years before. However, seems that this is still a field where you can save money with DIY :)

Best Regards, Thorsten.

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Thanks TK.

I've requested 3 GM5 and 3 PCB's.  I've PM'd you the details.

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