Yes. When I was a kid, I used to built intercom circuits that used the
speaker for both input and output. The PTT switch used to switch the
speaker between the amplifier input and output.

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Quah
> Sent: Sunday, June 01, 2003 11:04 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: EE: Can a speaker be Input Devices
>
>
> 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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