[sdiy] Audio Trigger circuits

[Fdi]

Hi all,

I'm also looking for such a circuit.
Something that outputs a trigger with an amplitude proportional to th
eoriginal signal.

This must be (can be?) a simple circuit, like the ones used on simple
percussion controllers... but I can't find anything I can build, since I
can't design and I need something clearly pictured...!
The only thing I have is the PAiA percussion sensor circuit
http://www.paia.com/drumsens.htm
but I'm not shure if it's exactly that... and it's designed to get the
signal from a piezo, etc.
How can this be modified to accept a signal from a preamp or, may be better,
from an env follower?

Please masters!


Fernando

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f
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> De: Oren Leavitt <oleavitt at ix.netcom.com>
> Fecha: Fri, 27 Jun 2003 10:31:37 -0700 (GMT)
> Para: synth-diy at dropmix.xs4all.nl
> Asunto: Re: [sdiy] Audio Trigger circuits
>
> Hello,
>
> It sounds like what you're after is the combination of these basic
building
> blocks:
>
> Filter(Lo/Hi/Bandpass, etc) -> Envelope Follower(Full wave
rectifier/filter)
> -> Gate/Trigger Extractor(Comparator w/adj. threshold).
>
> Oren
>
> -------Original Message-------
> From: steve jones <stevejones at hotpop.com>
> Sent: 06/27/03 06:36 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Audio Trigger circuits
>
>>
>> Hi All,
> Does anyone have a fairly simple circuit to produce a +5v trigger from
> an audio input? I know these are widely used but I haven't been able
> to find  a complete schematic.
>
> Ideally it would have a variable threshold and be tunable (ie to be
> able to trigger from high or low frequencies only, eg hihat vrs kick
> drum).
>
> It would also be handy to have the option of choosing between a fixed
> (but variable) trigger output voltage or have the input dynamics
> reflected in the size of the trigger output voltage. While the latter
> option is perhaps more "musical" because dynamics are included, the
> former would be useful for dance / techno where slight variations can
> detract from the pure "machine" feel.
>
> The context for using this audio to trigger would be in triggering say
> a synth kick drum from a  microphone signal from a live drummer (at
> the desk end so it would probably be gated / EQed). As a live engineer
> I would like to be able to beef up the drum sound with some analogue
> Umph, without attaching triggers to drum skins, ie. on the sly ;)
>
> Any thoughts / experiences / urls most welcome.
> Steve
>
>
>>
>
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