MegaDrum 56 inputs latest schematic and PCB

[Maylord.war]

Thanks Dmitri for the reply

For Isque -

The pinout connector pad

32 SOCKET


40 Pedal power
39 Low impedance pedal 1
38 High impedance pedal
37 Kick
36 HiHatE
35 HiHatB
34 SnareR
33 SnareH
32 RideE
31 RideB
30 CrashE
29 CrashB
28 Tom1R
27 Tom1H
26 Tom2R
25 Tom2H
24 Tom3R
23 Tom3H
22 Tom4R
21 Tom4H
20 Aux1R
19 Aux1H
18 Aux2R
17 Aux2H
16 Ground
15 Ground
14 Aux3R
13 Aux3H
12 Aux4R
11 Aux4H
10 Aux5R
9 Aux5H
8 Aux6R
7 Aux6H
6 Aux7R
5 Aux7H
4 Aux8R
3 Aux8H
2 Aux9R
1 Aux9H

[zebedeu]

the capacitor C15 (10uf) can be electrolytes?
I not find this value in polyester capacitors.
what would be the polarization of the board to put it?

[dmitri]

10uF can be electrolytic. Obviously it must be connected according to polarity - plus to plus(+5), minis to minus(ground).

[zebedeu]

the solder of the poles of electrolytic capacitor 10uf is this:
positive pole in the CN7
negative pole in the 6N138N

or

positive pole in the 6n138n
negative pole in the CN7

tks

[dmitri]

You can look at the schematic and see where +5 and ground are.

[Maylord.war]

If i separate the +5 and gnd from usb socket i can use a external power supply with usb or midi connection?

I think an LM317 or 7805 is required if are not present a stable +5dc. What do you think dmitri? thanks

[dmitri]

You can power MegaDrum from almost any +5V/0.5A regulated power supply.

[isque]

Hi Dmitri,
I got big crosstalk problem on this schematic. While try my hard to hit on the pad's foam place(base on piezo and under mesh head)I got strong crosstalk(hithat,kick,ride or more will be triggered at the same time),however i had set the xtalk at 3 and set the threshold more higher,still produce the crosstalk.I don't know how to solve this problem and where is incorrect.PS:I was use an metal box outside,this PCB and inputs PCB GND has connected .Is the GND need to wire with the metal box?

[dmitri]

If the crosstalk is due to problems on the board then xtalk suppression won't help. You have to thoroughly check your board and components.

[John Doe]

Hi!
Have anyone this PCB edition for 4051 and BAT85?
Thank you.