[geeks] Stupid Electronics Help...

[rjtoegel]

I would guess to DC isolate the inputs and prevent a voltage spike from
creaming the inputs.

Bob

Sent from my iPod

On Dec 31, 2012, at 12:41 PM, Jonathan Katz <jon at jonworld.com> wrote:

> I found this which gives instructions on wiring directly into the factory
amp,
> without having to use my relay and a second amp. I may go this route. Why
do
> they use resistors and capacitors instead of a diode?
>
> http://www.volvo-forums.com/index.php?showtopic=1497&st=0
>
>
> On Dec 31, 2012, at 1:52 AM, rjtoegel <rjtoegel at gmail.com> wrote:
>
>> Also, you can drive five speakers from a stereo amp. The front and back
can
> be
>> fed by each channel by using a fader control and the center front is just
>> between the hot leads from each channel.  That gives a difference between
> the
>> right and left channels.  Only problem is that in today's cars, the
speaker
>> grounds may not be grounded.    Sometimes messing with the speaker wires
> will
>> make the car computer throw out weird errors since the audio may be tied
in
>> with the computer.  If there are three wires from each speaker, don't mess
>> with it!  Trouble will ensue.
>>
>> Bob
>>
>> Sent from my iPod
>>
>> On Dec 30, 2012, at 9:13 PM, Jonathan Katz <jon at jonworld.com> wrote:
>>
>>> Thanks, everyone!
>>>
>>> I found a DPDT at Radio Shack which seems to have solved my "crisis" 
>> other
>>> than the fact I mis-read the label and wired it up wrong. I gave up for
>>> tonight and will resume my shenanigans once it gets a tad warmer out.
>>>
>>> The whole goal is to add an AUX in to my wife's Volvo. Her Volvo has a
>> fancy
>>> sound system that uses the MOST fiber-optic stuff, so you can't just
patch
>>> something in like with typical systems. Using one of the radio/FM
>>> mini-broadcasters is a PITA and the quality is horrid since the car has
an
>>> antenna that is integral with the tailgate(!)
>>>
>>> Going through my pile of parts I had a spare car audio amplifier. I
bought
>> it
>>> years ago at the firesale at Circuit City when they were going bankrupt.
>>>
>>> I put together an aux-in 3.5mm port on the dash and ran wires to where
the
>>> MOST amp is under the passenger seat. I also ran a 12V switch on the dash
>> and
>>> wired the hot 12V wire to under the seat.
>>>
>>> The goal was to have the relay turn off the MOST amp (which is why when
> the
>>> relay is deactivated that pole should remain closed so operation is
> normal)
>>> and power on my amp. Then my amp would pump sound to the existing
> speakers,
>>> splicing into the existing wires to existing speakers. Because my spare
> amp
>> is
>>> only two channel and I'm powering five channels (LR, RR, LF, RF, and
> Center
>>> Front) I was planning on using diodes in-line on each channel so that
with
>> the
>>> new amp hooked up I don't wind up bridging my entire set of speakers.
>>>
>>> My diode idea should work, right?
>>>
>>> On Dec 30, 2012, at 6:54 PM, rjtoegel <rjtoegel at gmail.com> wrote:
>>>
>>>> That's what I said. It's probably easier to find a dual throw than just
a
>>>> plain NC. Even Rat Shack carries them.
>>>>
>>>> Bob
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