[geeks] Stupid Electronics Help...

[Jonathan Katz]

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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