Re: AC to DC Transformer

I'm an amateur, but I've been around some car audio equipment and I do not
think that
a 12 volt supply at 1/2 an amp is enough to drive a car audio system. 12
volts x 0.5 amp
only yields 6 watts of power for both the radio/tape/cd circuit and the
speakers, right?

No wonder the supply burned up.


"CMM" <newsgroupinky@xxxxxxxxxxx> wrote in message
news:dvgor114cb9s3lbsqe08e66bhq909a4diu@xxxxxxxxxx
> I have a car audio device (Jensen Sirius satellite receiver) that I
> want to use inside. I have an extra antenna so that's no problem. It
> has an FM modulator allowing me to tune it in on my desktop radio so
> that's taken care of too.
>
> The problem I have is that I need the correct AC to DC transformer.
> After testing several with 12 volt outputs, I found one that worked.
> The others either would not allow the unit to power on or would allow
> it to power on but it would immediately freeze. The transformer that
> worked has an output of 12VDC, 500mA. It worked for about half an hour
> before burning out, leading me to conclude that it isn't rated for
> this application.
>
> I'm not sure exactly what I need. When it comes to electronics, I'm
> somewhat ignorant. (For instance, I don't understand why only one of
> about five 12 volt transformers worked.) To select a transformer
> that's appropriate, what do I need to look for? I'm thinking the
> voltage would need to be 12. To keep the transformer from frying, do I
> need something with a higher amp rating? What's the difference between
> regulated output, max output, and constant output?
>
> Here are some that I'm looking at but have no idea which one (if any
> of these) would be best:



.

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