On Sun, 27 Jan 2008 19:41:38 -0500, PeterD
wrote:

On Sun, 27 Jan 2008 15:42:14 -0600, John Fields
wrote:

On Sun, 27 Jan 2008 16:02:23 -0500, PeterD
wrote:

On Sun, 27 Jan 2008 09:52:04 -0600, John Fields
wrote:

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


I think the OP's specificatins rate current at .5W of audio output...
g

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Ok...
---

The fuse is 5A.

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

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

Assuming the power supply is regulated and doesn't allow the voltage
to rise significantly as current drops.

---
See "As long as the power supply looks like a voltage source"...
below.
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Not sure if I would gain any improvement in sound.

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

Assuming the power supply is regulated and doesn't allow the voltage
to change significantly as audio levels change.

---
What do you think a voltage source does?


You know, I know, but does the OP know? g

---
Dunno, but he will if he reads and understands this:

http://en.wikipedia.org/wiki/Voltage_source


--
JF