The first schematic does what you described (2 mono pads into 1 piezo/switch input).
Though, I’ve built the piezo/piezo to piezo/switch adaptor only (2nd schematic). This one provides a way to plug a dual piezo/piezo trigger into a piezo/switch input (for example, a dual mesh head pad into a TD8 tom input) … and it works perfect for me 🙂
If you want to keep your acoustic cymbal ringing, you may try to fix a http://www.toontrack.com/forum/tm.aspx?m=35470 using some double sided foam tape.
Place it under the cymbal, next to the bell.
Since the cymbal won’t be damped, it will produce a lot of vibrations, though.
I’m not sure you’ll be satisfied with such a setup but it’s probably worth the try.
Best.
PS : I’ll provide some info about how to build an e-cymbal from an acoustic cymbal ASAP. Unfortunately, it’s thought as a permanent modification.
I don’t use this cymbal anymore (I removed the edge switch stuff and use it as a simple crash). Actually, this kind of home made switch doesn’t like to be smashed for years 😉
That’s why I’ve built another 3 zone cymbal, and I plan to write something about it, as soon as my 2nd ride is ready.
Though, I want to try something new to convert acoustic cymbals and I need at least 20°C outdoor and no rain to work with some stinky polyester resin. Hopefully, summer should come nextly…
If you don’t want to mold a dome, you may use a small dish made of something that is solid enough to survive to your sticks (a small wood dish will do the job).
You may also cut the bell from a practice cymbal.
I just edited my previous post (“around” was confusing and I replaced it by “before or after”) 😉
The comment about R2 isn’t wrong. Actually, you can reduce the “rim sensitivity” by decreasing the R2 value, but you must keep R2 above a minimum value. That’s why you may change R2 for a 100K resistor and add a pot before or after R2 but you can’t simply replace R2 by a pot. R2 won’t be less than 100k with a 1M pot and a 100k resistor in serial connection.
Adding a pot between the Aux Piezo (+) and R1 will have the same effect (it will reduce the “rim sensitivity”).
About the sensitivity of your main piezo… Yes, a pot between this piezo (+) and your module will reduce the sensitivity (and the tiny pot present on most Yamaha rubber pads provides this functionality, btw).
I haven’t tried the second schematic yet. The first version works like a charm into my 3-zone hihat (I’m using the schematic with the yellow/grey drawn piezos), and it should work for your tom aswell.
You may add a pot between the aux piezo (+) and R1 (instead of a pot before or after R2), if needed.
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