DIY: finally, 3-ply+hotspotless+positional sensing

[nemo]

Since they are both in the middle and on the edge, I'm surprised that positional sensing works well with this layout

This is why the pot is there. To balance the signal to keep ps working without hotspot.
As a matter of fact I started with three pots, one for center head cones, one for other three head cones, and one for rim piezos.
After some tweaking I came to this solution and published here the simpler version.

You can also read the thread on vdrums forum; they're were some q&a's there as well. Same nick and title.

Another thing you can also try is the AKA Wayne's trick with changed polarity. I did not notice significant improvement in my build, but in his build it works (without any pots!).

[stringerbell]

yes but all the head piezo's are behind the same pot right? I don't understand how this affects what I described.

for Positional sensing, I expect you would need a strong signal in the center and then weaker and weaker the more you move to the edge. any edge sensor would make the signal strength go up at least a little bit when getting closer to the edge right? (even when it's toned down with a pot)

But I guess there is some margins in the way the edrumin handles this, where the signal can go up a little bit in near the edge but still get PS to work?

[stringerbell]

and thanks, Ill check the vdrum forum post as well

[nemo]

for Positional sensing, I expect you would need a strong signal in the center and then weaker and weaker the more you move to the edge.

I understood what you mean. I can only repeat what I already said.
The head pot enables you to balance/decide between how much of center cones' signal goes to edrumin.
If you decide to set the pot with maximum center signal, then you have ps but also you risk big hotspot.
So with the pot you can adjust the "amount" of the center signal (cool it). You can weaken the center to the point, where you still have satisfying ps and no center hotspot.

As I already mentioned above, you can also use three pots.

[stringerbell]

ah ok, just to double check: the head piezos on the side are not behind the same pot as the center piezos?

[nemo]

There is no "behind", it's "either". As in the picture.
... or you can use three pots, then each group of piezos should be "behind" (using your terminology)

[stringerbell]

ok, so to summarise my understanding: having a single pot to adjust the signal strength of all the combined head sensors worked well for you.

When initially starting to make this work for a 3ply head, what did you do first? add more center piezo's or add the pot meters?

and do you happen to still have any links for the parts you used?

[nemo]

ok, so to summarise my understanding: having a single pot to adjust the signal strength of all the combined head sensors worked well for you.

Yes, each group connected to different terminal, so the pot works as a balancer

When initially starting to make this work for a 3ply head, what did you do first? add more center piezo's or add the pot meters?

Alltogether

and do you happen to still have any links for the parts you used?

Please read the first post - the information is there

[stringerbell]

Check, my bad! I should read better before I type

In AKA Wayne's thread you posted that you (initially) used the black BQLZR cones like he used as well (from Amazon), so it looks like you also changed the type of cones when upgrading to a 3ply compatible build. Was this after introducing the pot meters? and what caused you to change?

edit: this is already answered in the vdrums thread.

[stringerbell]

regarding rim sensors placement, I came across this interesting post: https://www.vdrums.com/forum/advanced/d ... th-1-piezo