bat85

[ubaid88]

Well problems like what?
I have tested with a piezo.
No 1n5818 is working fine. I am using it. But it very difficult for it to fit on pcb. Its radius is 0.7 while bats have 0.5 radius. So your wide dirilling can damage the tracks of pcb.

[dmitri]

Well problems like what?
I have tested with a piezo.
No 1n5818 is working fine. I am using it. But it very difficult for it to fit on pcb. Its radius is 0.7 while bats have 0.5 radius. So your wide dirilling can damage the tracks of pcb.

Apparently 1N5817/8/9 are not fast enough. The obvious effect is an electrical crosstalk between channels on piezo hits. The multiplexers might get damaged as well.

[ubaid88]

Well problems like what?
I have tested with a piezo.
No 1n5818 is working fine. I am using it. But it very difficult for it to fit on pcb. Its radius is 0.7 while bats have 0.5 radius. So your wide dirilling can damage the tracks of pcb.

Apparently 1N5817/8/9 are not fast enough. The obvious effect is an electrical crosstalk between channels on piezo hits. The multiplexers might get damaged as well.

Can suggest me test to confirm that 1n5818 is not suitable to use? If that so i may need to make a new pcb.

[dmitri]

Connect a few pads to inputs on the same multiplexer and hit them fairly strongly. You will see crosstalk between inputs even without having mechanical crosstalk between the pads.

[ubaid88]

I have not build pads yet.
I have currently only tested with one peizo only. I will try with 3/4 peizos.

[ubaid88]

Success. No cross talk at all, With 1N5818. I 2 connected peizos at 8,9 pin(dual zone Ride) which is going to first multiplexer.
I have checked it. No problem at all. No crosstalk. See the video.
http://www.youtube.com/watch?v=6OA3GgZayw0

[dmitri]

Success. No cross talk at all, With 1N5818. I 2 connected peizos at 8,9 pin(dual zone Ride) which is going to first multiplexer.
I have checked it. No problem at all. No crosstalk. See the video.
http://www.youtube.com/watch?v=6OA3GgZayw0

What is an exact make and model of multiplexers you're using?

[ubaid88]

SGS Thomson hcf4051be
http://www.datasheetarchive.com/pdf-dat ... 391382.pdf

But they are very cheap one. Exactly equal prize of piezo each.

So do you they are different one than usual 4051s?

[dmitri]

Well, it might be that this particular version of 4051 has a better overvoltage protection/tolerance or your particular batch of 1N5818s has better characteristics.