On Sun, 27 Jan 2008 01:46:52 -0800 (PST), lou
wrote:

Hi!
Would appreciate some help.

Was thinking of using a car radio at home. Specs read current
consumption 1.5A (at .5W).

---
Something's wrong there.

Power is equal to the product of voltage and current, so:


P = IE = 12V * 1.5A = 18 watts


or, for 0.5W:

P 0.5W
I = --- = ------ ~ 0.042A
E 12V

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The fuse is 5A.

DC power supply should be at least 1.5A but can I go up to 4A without
harming the radio?

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Yes; the radio will only draw the current it needs.
---

Not sure if I would gain any improvement in sound.

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As long as the power supply looks like a voltage source the quality
of the sound won't suffer.
---


--
JF