You might have more luck sensing the current increase in the AC or DC
line feeding the radio.  I recall a simple cable heater on detector
which consisted of a few loops of wire around one leg hooked up to an
LED and resister.  Should be able to hook that to an optoisolator, or
use it directly with an opamp (rectify and amplify) to a 555 one shot
which will turn the amp on a configurable time later.

At a minimum, you can listen to the interface, and if it starts sending
out data, asume it's on.  Look at all the wires with a scope and turn it
on.  Probably puts out a 'hello' message of some sort.  Don't need to
decipher it - the fact that the lines are active and/or toggling will
let you know that it's on.

It may also be that the interface provides power that is only available
when the unit is on.

I hope this helps!

-Adam

Daniel Gliebe wrote:

>Does anybody know anything about the Kenwood XS8 and SL16 System Control interfaces?
>I have a friend who has a SL16 receiver and XS8 Amps and wishes the Amps to turn on in a delayed sequence when the Receiver is turned on.  I'm thinking I can program a PIC to do this but I know nothing about the interfaces or their protocols.
>Any info would be helpful.  Thanks in advance!
>
>   -Dan
>
>--
>http://www.piclist.com hint: To leave the PICList
>mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>
>
>
>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads