Funny you should ask.  Ran into this this weekend...
   http://www.mitedu.freeserve.co.uk/Circuits/Misc/Sp-mic.htm

Cheers,
-Neil.


On Sunday 01 June 2003 13:03, Quah scribbled:
> Can a speaker act as input devices to an Voice Activation circuit ?  I
> want to built a Voice Activation circuit without using Mic. Is this
> possible ?
>
> Any voltage frustration from the speaker that can trigger a transistor =
?
>
> Thanks.
> James

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