What is the best PCB?

[dmitri]

I understand, the card works without them?

It's the meaning of "optional", isn't it?

if I want to use USB to program, I'll have to use the PIC18F2550, right?

I don't understand the question.

with them it is possible to record the sound in the board directly?

The board will not record sounds directly with or without optional components.

[zebedeu]

my first question was wondering if I need to make any changes on the board to not use Them, or if it's just not put Them on the board?

without the PIC18F2550 is not possible to use USB to program the Megadrum?

[dmitri]

my first question was wondering if I need to make any changes on the board to not use Them, or if it's just not put Them on the board?

If they are optional then they can be omitted.

without the PIC18F2550 is not possible to use USB to program the Megadrum?

If PIC18F2550 is omitted, MegaDrum will not have USB so you cannot use MegaDrum over USB.

[zebedeu]

Anyone know if there is a replacement for 4851? I do not meeting
none here in Brazil ... and nobody here knows tell me a replacement!


tks

[dmitri]

Anyone know if there is a replacement for 4851?

Yes, there is. 4051 with bat diodes as shown in "Latest MegaDrum schematics. 32 inputs"

[zebedeu]

already bought the components to build the scheme of 56 entries ... the only thing I'm missing is the 4851

It is possible to replace this IC on the other, in the same schema?

[dmitri]

All the components you bought will fit http://www.megadrum.info/forums/viewtopic.php?f=3&t=266

You already have a choice between schematics which use 4051 with bat85 diodes or 4851 ICs. 4051 ICs are available everywhere. If you have problems sourcing 4851 ICs, choose a schematic which uses 4051 ICs. There is no third option.

[zebedeu]

Hello Dmitri,
I still can not find anywhere here in Brazil the 74hc4851
and also can not find the BAT85 diodes ... you know a shop where I can find 74hc4851?

can utilize this version?
http://www.farnellnewark.com.br/cilogico16psoic, product, 9591532.4509026. aspx

how do I put it on the board?

[dmitri]

It is up to you. There are SOIC to DIP converters out there, e.g. on ebay, but they are expensive. Or if you searched better, you would have found this: http://uk.mouser.com/ProductDetail/Texa ... IQGUY2M%3d

[zebedeu]

Hello guys,
Purchased components,
card already eroded!
only thing missing now that this Atmega arriving, the LCD, and make the converters SOIC to DIP !
post the pictures after !