AwDeOh's Megadrum build.

[daddy4life85]

Ah that sucks! How can we program an Atmega32 our selves? Might be cheaper and easier to buy a new one and flash it then to order one from Synthex? Who knows though.

[Synthex]

Ah that sucks! How can we program an Atmega32 our selves? Might be cheaper and easier to buy a new one and flash it then to order one from Synthex? Who knows though.

With the new bootloader (version has a kind of protection from accidental MegaDrum firmware erasure) this should not happen.

For people who bought me a kit, I will do the exchange for free (of course if the atmega is not damaged).

[dmitri]

Ah that sucks! How can we program an Atmega32 our selves? Might be cheaper and easier to buy a new one and flash it then to order one from Synthex? Who knows though.

It can quite easily be done provided you don't reverse anything:) See http://www.megadrum.info/content/programming-mcus

[dmitri]

Ah that sucks! How can we program an Atmega32 our selves? Might be cheaper and easier to buy a new one and flash it then to order one from Synthex? Who knows though.

With the new bootloader (version has a kind of protection from accidental MegaDrum firmware erasure) this should not happen.

For people who bought me a kit, I will do the exchange for free (of course if the atmega is not damaged).

AwDeOh's problem doesn't seem to have anything to do with a bootloader. He applied reverse polarity power which most likely damaged Atmega.

[r0bbie]

[/quote]
AwDeOh's problem doesn't seem to have anything to do with a bootloader. He applied reverse polarity power which most likely damaged Atmega.[/quote]

I had the same problem of reversing USB polarity, lucky enough I first used my multi-meter and checked before flicking the power switch .

Maybe its not a bad idea to add an extra diode and smartfuse in the next version (Synthex?), to make this DIY project even more foolproof than it already is

[dmitri]

AwDeOh's problem doesn't seem to have anything to do with a bootloader. He applied reverse polarity power which most likely damaged Atmega.

I had the same problem of reversing USB polarity, lucky enough I first used my multi-meter and checked before flicking the power switch .

Maybe its not a bad idea to add an extra diode and smartfuse in the next version (Synthex?), to make this DIY project even more foolproof than it already is

A diode adds ~0.7V voltage drop. It will hurt dynamic ranges by 20%. This diode soldered in reverse and with reverse power supply applied will cause just the same problem.

[r0bbie]

AwDeOh's problem doesn't seem to have anything to do with a bootloader. He applied reverse polarity power which most likely damaged Atmega.

I had the same problem of reversing USB polarity, lucky enough I first used my multi-meter and checked before flicking the power switch .

Maybe its not a bad idea to add an extra diode and smartfuse in the next version (Synthex?), to make this DIY project even more foolproof than it already is

A diode adds ~0.7V voltage drop. It will hurt dynamic ranges by 20%. This diode soldered in reverse and with reverse power supply applied will cause just the same problem.

Not if you do it this way IMHO:

[dmitri]

This way it may damage an USB port on a PC if the fuse doesn't break quickly enough if at all.

[r0bbie]

This way it may damage an USB port on a PC if the fuse doesn't break quickly enough if at all.

1. Modern USB ports are current protected.

2. how about damaging your computer with reversed poliarity of the Megadrum, frieing the Megadrum chips will draw certainly more current than the USB max specified 100Ma.

[dmitri]

Well, you are probably right. But if it's possible to apply a reverse voltage to the board, what warrants you from inserting ICs into the sockets turned 180 degree?