Sure, but impedance matching is the problem. U need to amplify it but since the
speaker's Z is 8 ohm, u need to use an 8 ohm/1K audio transformer to step up
the sig & impedance if feeding into a common emitter amplifier.
If u don't want to use a transformer, u can put the spkr in the emitter leg
(low Z) of a common base ampifier and match Z's & boost o/p sig that way.

Debbie

> > 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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