Next message: Peter Bennett: "Re: T&T: Wiring speakers to multi amps"
Thursday, December 1, 2005, 8:01:09 PM, John wrote:
JBWWW> I want to install a 12V automotive radio/CD player, (set up
JBWWW> for 4 speakers) in the salon and drive the 4 speakers already
JBWWW> installed, (two inside salon and two out on back deck) that are wired
JBWWW> to the home stereo reciever/amp we now have.
JBWWW> My concern: how can I do this without backfeeding the amp not in use and doing harm?
JBWWW> I know that properly sized/ placed diodes in the 8 amp wires
JBWWW> could, in theroy work but I'm not savy enough to know what and how or
JBWWW> if something already exists for this situation.
No - diodes won't work in an audio circuit - audio is AC, and a diode would block alternate half cycles.
JBWWW> I also know that if I could find a switch box that would
JBWWW> handle the 8 inputs switched to the 4 outputs that would work but
JBWWW> have been unable to find such a unit or someone that knows of one by
JBWWW> asking at local audio/ radio shack.
JBWWW> Anyone done this, or have a suggestion? Hope so....
To switch 8 poles, you will have to use a rotary switch - they are available with many more poles than toggle switches. alternatively, you could use a toggle switch to control a couple of 4 pole relays.
You may have to go to someplace like Digikey, Mouser or Jameco to find the necessary parts.
--
Peter Bennett, VE7CEI Vancouver, B.C., Canada
Lien Hwa 28 (AKA Polaris 30) "Sea Spray"
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
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