SickVette

Microtime....Peripheral Electronics makes a part called a SPK. That is a speaker switcher. It is two channel and designed to route a signal from to sources to a single set of speakers. That should work for your speaker switcher.

They also make two other parts that allow you to have an aux input to your factory radio. These two parts are supposed to work on 98 Toyota factory radios.

Those parts should be able to help you at least get started. What would be best if their was a way to output 12v from your computer before the GPS talks. If you could do that then it is easy to make a relay switcher that would allow the GPS to override anything that is playing through the speakers.

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Zebelkhan

Like I said I don't know much about electronics so I could be wrong, or, mixerboards have something specific that deals with it. I am sure they are more than just a knob. All I know is that I have mixed two outputs (an old stereo and a tape player/recorder) together to a single set of speakers and after a while my stereo sound got really sick!

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microtime

I saw this on another posting. I believe this will do it without me having to make a circuit on my own.

ftp://208.187.38.55/Phoenix_Gold/Man...D44_Manual.pdf


I can't believe this is that hard to do. I'm amazed I'm the only person who wants a head unit and a PC to make noise automatically without a switch or the like....

Next time I wouldn;t have gotten a Mocha but did a smal form factor Mobo somewhere else. This way I could have had a realsound card and not have to rip apart a USB Oronico WIFI card. My kingdom for a a few PCI slots...

WiCKeD 5.9L

Not to disappoint you, but I posted this last night and deleted it, because I didn't want you to FUBAR your speaker system. My Kicker amp also has low level & high level inputs, however it specifically says NOT to use them at the same time. Not sure what it will do, but smoke and sirens spring to mind.

Here is the illustration from the manual:

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greenman100

ok guys think about this

when you take a stereo (2 channel) amp and bridge the outputs, you are connecting 2 separate amps together.

what's the difference here?

integramodder

I would think so long as you are matching low level to low level and high level to high level that you shouldnt have a problem....

greenman100

agreed

walky_talky20

The 98 Avalon with the 7 speaker system has a factory amplifier. To have both the audio from the Factory Head Unit as well as a PC (GPS) you need to build a line level mixer. Something with two stereo inputs and a single pot for crossfade would be ideal. Here is a link to a simple mixer circuit. I'm sure there are others that are simpler and more suitable for this purpose. (Like I said if you could build one with a single pot that would be best.)

http://www.epanorama.net/circuits/linemixer.html

The only small problem you might have is that the factory amplifier has 4 inputs instead of 2. FL FR RL RR. A solution would be to only put the PC (GPS) into the front inputs. FL FR.

Hope this helps.

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microtime

I believe the solution from walky_talky20 will do it. I just need to build the circuit now. I made the Radio Shack trip and have all the pieces except the pots - they don;t cary them, off to componenets catalog people now. I still have 1 questions though...


This part:
The only small problem you might have is that the factory amplifier has 4 inputs instead of 2. FL FR RL RR. A solution would be to only put the PC (GPS) into the front inputs. FL FR.

I do want to use all 4 speakers though,,,, When I listen to MP#'s or have a DVD movie I'd want it everywhere? Can I build 2 mixers and tie them into the front and rear channels and put diodes in the positive lines so that they don't feed back? I'm almost there.....


also, does anyone have the wiring diagrahm's for these?

walky_talky20

I sent you the wiring diagram for the 98 avalon (pdf). As far as mixing the pc into all 7 speakers. You have options. There might be a simpler way using less expensive pots, but I would use two 4gang pots. One for the front and one for the back. The schematic I put up earlier requires 4 pots, but these can be replaced with one 4gang pot which is essentially a crossfade. And you double it to add the rear. Add a second 4gang pot or go to an 8gang pot, but I think the 4gang will be hard enough to find (alternatively you could go to 4 double gang pots, but thats not very user friendly). This is creating 2 mixers. A front and a rear. The reason for 2 mixers is to preserve the fading function: that is the ability to fade the music to the rear. With 2 mixers it is possible to have GPS in the front and RADIO in the rear. If this is not important than you can just split the output of the first mixer and send it to the amps front and rear inputs. I can draw you a schematic if you like and show you exactly where to hook things into your car wiring.

-Also I believe the 10k resistors used in the schematic could safely be changed for 5k's so as to retain more available volume from the system.

-You shouldn't need any diodes at all.

I hope I am not too hard to follow. It is a lot of stuff to think about.

ALonDonThinG

Link to a simple mixing circuit to put inline before your amp
http://www.tkk.fi/Misc/Electronics/c...s/linesum.html
you can conbine two diff line level inputs .
hope it helps

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