the Keith Raper circuit with the megadrum?

[dmitri]

They did: http://www.megadrum.info/forums/search. ... mit=Search
http://www.megadrum.info/forums/viewtop ... hilit=zone

[cheapthrill]

Hi. This is my first post here ( I think). I am usually over at the vdrums.com forum... I use a Roland module, but stop over here from time to time to see how things are going.

Anyway, I built the 3-zone according to the supplied schematic in this thread. It will not work with Roland, but it does work with a Megadrum? Has anybody tried it personally? I want to, but I don't have a MD to try it with. Although the Roland module can't accommodate three ride sounds for a single input, it does seem to switch between the zones really well.

[Synthex]

I built the 3-zone according to the supplied schematic in this thread. It will not work with Roland,

Although the Roland module can't accommodate three ride sounds for a single input.

Only Yamaha module and MegaDrum can do it !

but it does work with a Megadrum?

Yes.

[cheapthrill]

I built the 3-zone according to the supplied schematic in this thread. It will not work with Roland,

Although the Roland module can't accommodate three ride sounds for a single input.

Only Yamaha module and MegaDrum can do it !

but it does work with a Megadrum?

Yes.

Cool. What if I wired a choke membrane switch to the edge piezo, would either a Yamaha or a Megadrum also acknowledge a prolonged signal as a choke like a Roland would?

[dmitri]

Cool. What if I wired a choke membrane switch to the edge piezo, would either a Yamaha or a Megadrum also acknowledge a prolonged signal as a choke like a Roland would?

So it is a piezo and a choke switch in parallel? Interesting. The physical separation between a bow and an edge piezo must be good. I'll think about adding this feature.

[sdman]

Okay. Let me try to explain my problem with my poor english. I have Peace training set with plastic cymbals. And megadrum as a module (and it works fine with yamaha-style cymbals 2 and 3 zone.). So i've glued 2 piezos at the bottom of the plastic cymbal. One at the bow, and one at the edge. And i have soldered KRC right as it is on that picture (contacts are reversed on the bow piezo):
http://vdrums.com/forum/attachment.php? ... 1185238556

And it does not work as expected. Even if the contacts on the bow piezo are not reversed. Multimeter shows me about 220 mV on the Tip, and when i hit the cymbal it shows me about 225 mV. The trimpot stays on 100 kOhm. On megadrum i get only bow signals and 5-10% of rim signals. And it does not depend on the spot where i do the hits. And when i raise the threshold for the rim switch in megadrum settings, at some position it gets only 3rd zone signals when i hit my cymbal. I'm not good with electronics(honestly i can only solder with no drstanding how it works), so my questions might be silly. Should i add 1 MOhm resistor and diode to main piezo circuit as it is on that picture?:
http://dtxpander.co.uk/DKDI-21.pdf

And i still want to use edge piezo only as switch, and bow piezo to get the signal strength. Because the edge zone is too vibrating (the plastic is thin).

Thanks to everyone who give me advices

[Maylord.war]

If i remember right ....

If you apply the R2 higher than 1Meg Ohm the sensivity of the KRC increase...

The "rule" of KRC is " For less sensivity reduce the R2 value " , i think is possible to do in this way and vice-versa.

Try with a lot or "rim threshold" setup or check the connection.

Sorry for my english, regards