www.megadrum.info

Here is my last Digital PCB design

On the board :
- True USB with 18F2550
- Pot to adjust the LCD contrast
- KeyBoard diodes
- MIDI activity Led

All in a smaller space !!!

THIS DESIGN IS DEPRECATED http://www.megadrum.info/forums/viewtopic.php?f=3&t=108&start=0

And With it, my new analog PCB with 32 inputs.

THIS DESIGN IS DEPRECATED http://www.megadrum.info/forums/viewtopic.php?f=3&t=108&start=0

Great job! Maybe worth throwing in a few more decoupling capacitors and placing them closer to power pins of ICs?

dmitri wrote:Great job! Maybe worth throwing in a few more decoupling capacitors and placing them closer to power pins of ICs?

For this type of circuit is quite sufficient.

hello all!
Maybe a estupid question, but, are the diodes inside the 74s1053 compatible with the bat 85? is there no problem?
Thanks.

Tyrell wrote:hello all!
Maybe a estupid question, but, are the diodes inside the 74s1053 compatible with the bat 85? is there no problem?
Thanks.

The 74s1053 consists of a 16-bit high-speed Schottky diode array suitable for clamping to VCC and GND.
Exactly what we do with Schottky diode bat85 !
Then no problem

synthex, Do you think the updates that Dmietri are doing for the 32 input will work with your very effiecient design? or have you gotten this working already? Just wondering.

cadman97 wrote:synthex, Do you think the updates that Dmietri are doing for the 32 input will work with your very effiecient design? or have you gotten this working already? Just wondering.

It's already working !
I have already achieved the 32 inputs.
Dmitri should publish soon the firmware for 32 inputs version ...

Very cool, All my questions for now are answered. Off to the store I go.

Just verifing the new parts list I am creating.

Hopefully Dmitri will have a christmas present for us I'm building this for my son.

Ok, i see but clamp what range? Same as bat85 (30v i guess)? dont matter?
Sorry my english...
Thanks