Circuit to convert switch signal to piezo-like signal?

[djbclark]

I'm wondering if anyone with more electronics knowledge than me has considered making a circuit that converts a switches signal to a piezo-style signal so that it would work with DSP Trigger.

Esp. Important now that it looks like new edrumin4 units are more than a year away

I'm not sure how complex such a circuit would need to be, my initial thought would be the switch would just have to trigger the momentary release of a piezo-level current and voltage. (This would be for crossstick and rimshots so lack of velocity info wouldn't be too annoying, or maybe could be detected by the main piezo). Hmm actually maybe it's more a routing issue, eg if switch a is triggered send piezo output to output a, if b is triggered send to output b, if neither is triggered send to output c, if both then output d.

There is a circuit schematic that does kinda the opposite of this up at https://edrums.github.io/en/diy/keith_pp_2_ps/

Schematic of what I believe the two switches are like on my device / how they share a single output conductor at viewtopic.php?f=33&t=1584&p=11256#p11256

[Rob]

There's no passive way to do it. That's why I made eDRUMin.

[djbclark]

Is there a specific component that's causing the edrumin4 delay? I know some MIT people now working in the Shenzen electronics industry, could try hitting them up if that might be useful.

[Rob]

There is. I'm also well connected and at this point I just need to wait.

[djbclark]

I'm sure you are, but what's the harm in trying to crowdsource?

Maybe some individual happens to have a bunch of them or some bigcorp like Sweetwater does and would do a mutually beneficial deal of some kind.

In any case, thanks so much for designing and producing the edrumin, from all the research I've done they are super awesome

[djbclark]

There may be a simple way to get at least a one-velocity sound from one of the rim switches using only a resistor and a seperate mic input, as that's what this Android app does:

(See page for schematic; uploads seem to be disabled in this forum or I could easily just be blind :-)

https://play.google.com/store/apps/deta ... uitytester

I believe this relies on the fact that most computers send out a small voltage in order to be able to detect the presence of a mic.

Also re: no way to do it passively, assuming a 4-conductor computer-side jack (TRRS?) couldn't software play a tone over one of the stereo channels that is routed to the switched device and then detected (or not) by the mic on the same jack?

Gotta go unpack my electronics stuff,
-Danny

[Rob]

I believe this relies on the fact that most computers send out a small voltage in order to be able to detect the presence of a mic.

Seems reasonable, but I doubt the same is true for professional audio interfaces.

Also re: no way to do it passively, assuming a 4-conductor computer-side jack (TRRS?) couldn't software play a tone over one of the stereo channels that is routed to the switched device and then detected (or not) by the mic on the same jack?

Yes, that would work.