Most Efficient?

Guest · Post by **Guest** » Fri Nov 12, 2004 8:50 pm

Which is more effecient?

7805 replacemetn

Dc convertor

Post by **Sparkfist** » Fri Nov 12, 2004 8:53 pm

Dc-dc converter. The 78xx regulators burn the extra voltage off as heat.

JackFrost22 · Post by **JackFrost22** » Fri Nov 12, 2004 8:59 pm

Or a switching regulator

Guest · Post by **Guest** » Fri Nov 12, 2004 9:06 pm

thanks for the help

another thing was voltage does the 7805 output?

does it drop the 12v down or somethiong to 7.5?

Or am i mistaken

JackFrost22 · Post by **JackFrost22** » Fri Nov 12, 2004 9:08 pm

yup your right

Post by **SpongeBuell** » Fri Nov 12, 2004 9:11 pm

no, it takes 7.2 to 36 volts and brings it to 5

JackFrost22 · Post by **JackFrost22** » Fri Nov 12, 2004 9:13 pm

whoops i m,isread it.

Post by **Sparkfist** » Fri Nov 12, 2004 9:15 pm

So you know the 78xx regulators output voltage are the last two digits.

Guest · Post by **Guest** » Fri Nov 12, 2004 9:20 pm

SpongeBuell wrote:no, it takes 7.2 to 36 volts and brings it to 5

huh?

man i feel dumb

so it takes the 12v drops to 7.2v then to 36v then 5v?

how the hell does that work?

I thnk i said something wrong

JackFrost22 · Post by **JackFrost22** » Fri Nov 12, 2004 9:23 pm

it takes anything up to 36volts down to 5

Guest · Post by **Guest** » Fri Nov 12, 2004 9:25 pm

oh yeahh duuuh read it wrong

soo if the 7805 just takes the 12v down to 5 where does the 7v worth of energy go is it just turned to thermal energy

JackFrost22 · Post by **JackFrost22** » Fri Nov 12, 2004 9:25 pm

You should regester

Post by **Sparkfist** » Fri Nov 12, 2004 9:31 pm

Holy crap!

The 7805 works with any voltage input of 7-36 volts, it than outputs 5vots.

SnoopingGuest · Post by **SnoopingGuest** » Fri Nov 12, 2004 9:32 pm

Done

I've been hanging around for awhile now back on the old forum aswell.

I finally registered.

Anywho what i am getting at is does the N64 really need 12v isn't it just wasted by the 7805 in the form of heat?

Post by **gannon** » Fri Nov 12, 2004 9:33 pm

It's just turned into heat, where as a dc-dc converter reuses most of it.