Inside the Roland MV-8000

[ilmenator]

Hi all,

as it seems to become a good tradition of publishing photos of opened gear (thanks Artesia!), I would like to contribute some of the trigger pads of a Roland MV-8000 (thanks moxi!). If you ever wondered how these things are built - here you can see.

Best regards, ilmenator

[ilmenator]

Also, here are some of the rubber parts and the backside of the pad PCB. Apparently, velocity sensitivity is actually pressure sensitivity: it looks to me as if they analyzed the resistance which is varied by the amount of pressure that is forced upon the pads. Actually, those rubber parts have an inner dome, so the feeling is rather "hard" or "stiff" when you press it in the middle, and very sluggish if you press the trigger buttons in the corners.

Best regards, ilmenator

[Artesia]

cool :)

hmm... remarkably like m-audios trigger finger unit (something i posted a while ago)

they both seem to be based on resistive technology.

[ilmenator]

Yes, indeed VERY similar. That Trigger Finger biopsy Artesia is talking about can be found here.

On The Trigger Finger, is there no foil between the rubber pads and the printed circuit board? On your photos it looks like the rubber button touch the PCB directly, but there must be some kind of layer that changes resistivity with changing pressure?

Best regards, ilmenator

[Screaming_Rabbit]

On The Trigger Finger, is there no foil between the rubber pads and the printed circuit board?

They seem to use interlinkelectronics sensors... or interlink even produces the whole Frontboard-PCB.

From the Webaddress printed on Artesia's PCB:

http://www.interlinkelectronics.com/force_sensors/products/forcesensingresistors/standardsensors.html?specs=1

Greets, Roger