PCB DESIGN - All In One v2.5 - 32 inputs with 74HC4851

[kb9jlo]

Is this design still "valid" and what firmware/USB code do you use for this design?
Thanks,
Dan

[timekeeper]

Is this design still "valid" and what firmware/USB code do you use for this design?
Thanks,
Dan

The design is perfectly valid (synthex's design, not mine). The firmware is not related to a pcb design but to how many inputs there are and which Atmega/Crystal combination you use. Ask here if you have any questions.

[kb9jlo]

The design is perfectly valid (synthex's design, not mine). The firmware is not related to a pcb design but to how many inputs there are and which Atmega/Crystal combination you use. Ask here if you have any questions.

Thanks. I re-read some of the earlier posts and saw that this question had been asked before. Sorry. I was looking through the gallery at some point and noticed that some of the LCDs said something about SYNTHEX or I thought I saw something... I'm going a little crazy reading and re-reading.

But thanks again. I'm going to try to etch it. I'm going to use the PDF file off of page six of this topic. I printed it and held up a 40 pin connector and it looks right on. I'll verify the dimensions.

Dan

[timekeeper]

My progress so far:



Wish me luck!!!

[timekeeper]

It's alive!!!! Pictures to come... Thanks to both Dmitri and Synthex, Jman31, plus all the guys that helped me out!
God bless you all.

[anirudh.pianist]

Wat is the true size of the all in 1 pcb and also the jacks pcb...any1 can giv proper pdf's please?i want to do this project..has any1 one this and this working?i will buy all components this week..i live in bangalore,INDIA.r ther any changes in pcb or anything?can the bootloader32.hex of megadrum can be flashed to atmega32 to be used in this project?can atmega32 be programmed by bootloader32.hex file downloaded from this forum with another PROGRAMMER and then be added to the circuit?

THANK YOU,

Bye,
Anirudh...

[jman 31]

There are some pdf files in this thread that are proper sized if I remember correctly.

[anirudh.pianist]

has any1 one this and this working?r ther any changes in pcb or anything?can the bootloader32.hex of megadrum can be flashed to atmega32 to be used in this project?can atmega32 be programmed by bootloader32.hex file downloaded from this forum with another PROGRAMMER and then be added to the circuit?

THANK YOU

Bye,
ANIRUDH

[anirudh.pianist]

wat is the difference between pedal and hi hat ports?plz help?sorry im a rookie...

Bye,
ANI

[timekeeper]

Here is the list of materials from mouser.com as asked through p.m. by member Russ15.
A few thing to keep in mind:

1) I take as a must that YOU DO KNOW how to use BOM on mouser.com
2) There are two lists inside the zip file.
3) The lists don't include an LCD screen as they are over priced in mouser. Buy it from ebay.
4) This list synthex_2-5_mouser_trimpot.xls includes a trimpot for controlling LCD's brightness, as Synthex's original design did. All latest Megadrum firmware allows you to control brightness with buttons. I strongly suggest not to use the trimpot! If you decide to do so, order synthex_2-5_mouser_no-trimpot.xls instead and follow these instructions by Synthex himself, as shown on the attached picture:

You must remove the trimpot.
Connect a capacitor of 100nF between 1 and 2.
Connect a resistor of 10k between 1 and 2 (optional).
Connect a resistor of 1k between 2 and 3.
You can mount this last resistor directly on the LCD display (pin 3 and pin 14).

5) This list served me OK when I ordered my components but might contain some errors since I had many more items for different projects in that same order. Please crosscheck it with Synthex's bill of materials before ordering.
6) This list has PIC18F2450 and not PIC18F2550. Both work fine but the first is cheaper. But, if you don't own a PIC programmer, it's better to buy PIC18F2550 as it's better supported by serial programmers. If you don't know what I am talking about, buy PIC18F2550 instead and pay a dollar more.
7) If someone eventually uses any of these lists, please add feedback here!