🚀 go-pugleaf

"James Sweet" <jamessweet@hotmail.com> wrote in message 
news:zDthf.6821$Dx3.3359@trnddc07...
> Matt Flax wrote:
>> Hello,
>>
>> I would like to begin to repair a few car amps. I have around the place 
>> at mine ....
>>
>> They all seem to have massive power filters and two major types of active 
>> components ...
>>
>> Can anyone point to a good place to see a generic car audio schematic ?
>> I have tried to find the schematics for these particular amplifiers, but 
>> alas no luck so far ...
>>
>> thanks
>> Matt
>
>
> There's been several construction projects in various magazines. 
> Essentially they're very similar to a household amplifier, except rather 
> than a 60 (or 50) Hz transformer stepping down the line voltage, car amps 
> use a high frequency switchmode power supply to step up the 12V to the + 
> and - voltages required by the amplifier. First determine whether the 
> problem is in the power supply or the amplifier section, then Standard 
> diagnostic procedures apply to either portion. Usually the problem is not 
> too hard to track down, most all these amps are very similar at a basic 
> level.

Many (most?) have a single brick PA module per channel, which in my 
no-longer-recent experience has been source of the problem much of the time. 
A quick check of the web for data on the brick concerned will reveal a 
recommended/sample circuit, which often as not is followed close enough to 
make fault finding easier.

Cheers.

Ken