MOTM

Here's an easy seat of the pants calculation you can use:

P = V*I, where P = power consumed, V = voltage, I = current drawn. If 
you want to know how much power you are drawing, you would look at 
the input side of the power supply, not the output side. That's 
because power supplies are not anywhere near 100% efficient, and a 
significant percentage of the power drawn gets lost to heat.

So voltage is 120 volts. Without measuring exactly how much current 
you are drawing from the wall, you can be sure that your power supply 
can't draw more than the fuse allows. My PowerOne supply is close to 
twice as powerful as the MOTM-900 (which also uses a PowerOne core). 
My supply is supposed to be fused with a 1A fuse, so let's take that 
value for argument's sake.

If I was maxing my supply out drawing 1 amp, I'd be drawing about 120 
watts. You are probably drawing around 70 watts or less. So it's no 
worse than burning a 75W lightbulb.

Moe

Dave's Hot Rod MOTM Shop
http://www.users.qwest.net/~daveb2

--- In motm@y..., "J. Larry Hendry" <jlarryh@i...> wrote:
> ----- Original Message -----
> From: <andy@g...>
> Since I live in California, land of high electricity costs and
> brain-damaged politicians, I have this question.   How much power
> would a MOTM system use, let's say a 20 module and a 40 module
> system?   How would that compare roughly to light bulbs?   Would a 
20
> module system be comparable to a 150 watt light bulb, more, less?
> -----
> Hey, there a question I know something about, light bulbs.
> The short answer is VERY little.  Less than a 150W lightbulb.
> -----
> 
> It seems to me that the amp (any amp) would use more
> power than a MOTM.
> ----
> I agree (well, maybe not a "headphone amp."
> 
> Now, if you want to know why power really cost so much in CA, e-
mail me
> privately and I will tell you.
> 
> Larry