Ian,

Almost any PIC can do it. all deepens how do you
want to operate. When you say sound activated switch
you mean any sound or any specific frequency lat say 1 Khz
well I assume any sound then the block diagram will be

mic=> preamplifier =>simple DC converter => PIC input => PIC output

to make sure your diagram works use any scope connect it to
DC converter output then talk or hit the mic on output you
should see DC volts going up and down so how the pic is
going to recognize when it is on or off. If you are using none ADC
PIC  has minimum voltage for 0 and 1 all deepens type of
input you are using  TTL or CMOS. If you still need more help
let me know.

Andre Abelian

> Elementary electronics question here.
>
> How can I hook a mike to a PIC input so it triggers at
> a certian level?  I am guessing one could do it with a
> transistor and pot for adjusting the trigger level, but
> I have been unable to rig anything up that works.  Ack.
>
> Vaguely EE related question.. any opinions on the best
> CNC routers for doing protoboards?  Looking for $10k
> and under price range.  Thanks!
>
> 15 years of software programming have NOT prepared me
> for the hardware end of things, even if the PIC
> assembly came easily at least. :-)
>
> --
> Ian
>
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>

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