www.megadrum.info

Hello,

Kit Version 2.7 is now available !

This kits containing the new 32 inputs "All In One" PCB v2.7 and all 7 ICs :

PCB v2.7 Professional achievement :
- Double Layer
- Copper Thickness 70 um
- 145 mm x 70 mm with mounting holes
- Top Silk Screening
- Blue or Green Solder Mask



All 7 ICs :
- 1x Programmed Atmega32-16PU with bootloader (multi clock)
- 1x Programmed 18F2550 USB 2.0
- 4x 74HC4851
- 1x 6N138



32 triggers inputs connector, USB connector, MIDI connector (In and Out/Through), LCD screen connector, Keyboard connector, ICSP connector ...
Fully USB plug'n play, works with all Windows like XP and Vista, Mac OS, Linux, ... (Fully USB2 compliant)
All 32 Inputs of this kit are protected against ±15kV electrostatic discharge (ESD) shocks (Fully IEC1000-4-2 compliant)
Lot of features : USB on board, Optional external power, Keyboard pullup resistors, And much more ...

The schematics :



Here is the list of components to be purchased in addition to the kit and pinouts :




A final result :




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> > > > > > > > > > > > > > > > > New KIT v2.8 is available < < < < < < < < < < < < < < < < <
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Here is the new topic : http://www.megadrum.info/forums/viewtopic.php?f=3&t=456
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Regards,
Synthex



All v2.4 Kit history : http://www.megadrum.info/forums/viewtopic.php?f=3&t=108

This definately needs a transparent case, it looks so awesome!

Here is a small explanation on the modularity of the PCB.



If you do not need the MIDI connection : do not mount the brown part.
If you do not need the USB connection : do not mount the green part.
If you do not need the external power supply : do not mount the red part.
If you do not need the LCD nor the keyboard : do not mount the pink part.

Synthex

So, why do you include both 74HC4851 and MAX4558? Overspill issues?

Synthex wrote:Here is a small explanation on the modularity of the PCB.

PCB v2.7 Color3p.jpg

If you do not need the MIDI connection : do not mount the brown part.
If you do not need the USB connection : do not mount the green part.
If you do not need the external power supply : do not mount the red part.
If you do not need the LCD nor the keyboard : do not mount the pink part.

Synthex

What about the blue part?

slayer666 wrote:What about the blue part?

If you do not need Megadrum : do not mount the blue part.

Beamtreetaker wrote:So, why do you include both 74HC4851 and MAX4558? Overspill issues?

With the MAX4558, there is overspilling if the piezo signal is too strong.
With the 74HC4851, there is no overspilling if the piezo signal is too strong.

But if the pad is too hot, you're loosing dynamic range ...

So you can use the one that better fits for you !

sorry to sound ignorant but what does 'a too hot' pad mean?? also synthex, are my IC's on their way to me? have i got the new version of things?
the PCB looks very nice, good work, looking forward to building.

zebedee398 wrote:sorry to sound ignorant but what does 'a too hot' pad mean?

A "hot pad" is a piezo pad which is too sensitive and which produces a voltage too high for the microcontroller.

zebedee398 wrote:also synthex, are my IC's on their way to me? have i got the new version of things?

Yes, your PCB v2.7 and your 11 ICs were sent.

zebedee398 wrote:the PCB looks very nice, good work.

Thank you.

how about a step by step guide for beginners to have set all the components?
is easy to set all the sensitive parameters?like a roland td-3 one?

I´m interested in the megadrum,but before all,i want to know if it´s easy to finish after buying sintex kit.

thanks in advance