Multiple Power Supplies from One Wall Wart

What is a "Wall Wart"?

Cheers

Martin

it converts AC into DC. (If you don't know what that is please google. could of googled this question to)

anyways it converts the ac power into dc power. I'm sure you have a few laying around your house. they are the things that plug into your wall socks, they usually have a small box that plugs right into the wall and then a cable coming from it is used to power anything from cell phones to routers to IPod docks.

This is an engineering forum, precision of language is a useful skill.

Excuse me if I'm not well versed on slang terms. If you mean an AC adapter, say so. Use of terms like "Socks", appears to be simple laziness, I presume you mean "Sockets", is typing two more letters so difficult?

Now to get to your original post, if your adaptor is only rated at 6 watts, how are you going to power a 30W amplifier?

Cheers

Martin

ok. well your question was quite simple to begin with.

i didn't know that that the ac converter was only 6w. i have never been thought any thing about circuits or electricity. i have picked it up on my own from simple projects and such.

I didn't mean to type socks, meant socket. I'm bad at spelling

Learn these basic terms: Ac adapter = brick = wall wart

Regards:

The power of your "Multiple-Power-Supplies-Wall-Wart" is:

1. 12vdc 500ma

2, 12 volts to a computer fan

3. 12 watt LED

4. 15w + 15w amp to work =30W

and like

5. 4x 15W= for a laser ie 15+15W = 4x2x 15W = 240W but later you say <the 3,7 volts and the 4v for the laser >

so it = 4 x @ what ratings you think = 4W + 4 x what ratings you think A

Regulation @ lo-Voltage is quite coplicated if feed-wires are long & thin. There you need Remote-Sensing Supplies

All that is NOT a "Multiple-Power-Supplies-Wall-Wart" but a cutom-designed Power-Pack

To make it "Multiple-Power-Supplies-Wall-Wart" get it in a Wall-Mounted or

Rack-mounted "Multiple-Power-Supplies-Wall-Wart"

Contact a local designer some where in your city or assemble yourself by purchasing

Off-the-Shelf units & mounting those in a single Case with a lot of connectors like

your "Multiple-Power-Supplies-Wall-Wart".

Enjoy all your jobs & entertainments & Have a Good Day !!!!!!!!!

try this site for three output switching Reg pwr supplies

http://www.mouser.com/catalog/637/2001.pdf

"so i want to take a 12vdc 500ma power supply and split that up to provide 3.7 volts, 12 volts to a computer fan, and how ever much power a 12 watt LED would use."

For the fan you can just connect it to the 12V input from the wall wart. You will need a regulator to drop it to 3.7V. That should get rid of any spikes. A 12W LED is very bright. Are you sure that is what you have? If you do you will need a 12V 1A brick for just the LED (Watts = volts * amps). That is about the biggest I have seen. You will need a separate power supply for the amplifier. You won't find a brick that big. I would not suggest trying to use the same supply for 2 projects anyway. Just buy the amplifier with the power supply built in. Good luck.

-S

I'm Planing on using this amp.

the fan is only rated to .56A, which is 500ma right?

i would rather only use one power supply. I'm using this to provide power to a laser light show (laser 4v, and amp 30a,)

would a laptop charger that supply's 5vdc and 12vdc (has two different plugs coming out of the "brick") at like 2A work well for this?

i want to build another supply to provide power to a projector I'm making (mp4 3.7v, fan 12vdc, and a 12w LED (it says it only needs 4.2V, 2800mA 4.2v at 2A right?)

2800 ma is 2.8 Amps. Nearler three, than two, and your 4.2V * 2.8 A = very nearly the 12 W rating. 4.2 * 2.8 = 11.76

radio shack sells wall warts up to like 28v and 1a, could i lower the voltage and increase the amperage?

"the fan is only rated to .56A, which is 500ma right?"

By now you should know it is 560mA (1A = 1000mA).

"(laser 4v, and amp 30a,)"

That would make it a 120 watt laser and it is highly illegal. One look by you or anyone seeing you show and they are INSTANTLY BLIND!

See this site: http://members.misty.com/don/laserdon.html and read the writing in red, then GIVE UP THIS PROJECT FOREVER!

its only a 5MW laser man. I'm smarter than to look into a beam of controlled radiation anyways.

the amp is used to run some pc motors. i have thread in her asking for help with this project already, look at that if you want to know what im doing.

"...and how ever much power a 12 watt LED would use."

Um, about 12W, since wattage is the conventional measurement of power. Are you sure you didn't mean a 12V LED? Not that any actually exist, but there are LED circuits that are powered at 12 volts. But 12 watts for an LED is HUGE, and would likely require active cooling which will load your power requirements even further.

If you feel a pressing need to design your own power supply since it reads as though you have a specific project in mind (and I understand your desire to protect your intellectual property), try a novel approach: Begin with an uninterruptable power supply (UPS) with a filtered output that is commonly available for computer use. Repackage the unit so that its output is applied via a full bridged rectifier with a common capicitor filter (to supply stable DC - a common design covered in every electronics text since Ben Franklin). Now tap the DC line to provide your various output voltages - these will need to be seperately designed invividual circuits and many already have "commercialy available off-the-shelf" (COTS) modules.

The UPS will provide a large amount of available, stabilized wattage and act as a protection against wall power fluctuation. In addition, it provides a stable platform for your power supply as various loads are switched on and off. Third, you can get them at Staples, Walmart, or any other store that sells computers and office supplies, and they're relatively cheap - but not wall-wart cheap. Sorry, but for what you want you will need something beyond a dime store solution.

Good Luck.

nah its 12w LED. read 2 post up.

i know it would be hot, therefore i would have a fan moving some air and i heatsink from an old Pentium !!! processor!

ill look into these UPS's

Cheapest way is to start with an ordinary PC supply.

http://www.helpwithpcs.com/courses/power-supply-basics-inc-pinouts.htm

You need to supply a power on signal back to the main (mother board) plug.

ok, well the help has been useful, but i still don't quite get what I'm being told.

but back to my question. I have this power supply. It provides 12vdc 2A and 5vdc 2a. I want to use this supply for the laser and amp.

The amp asks for 12v >2A. I think the amp will run fine if just a bit under powered, the amp wont be using the full 12v 2a the whole time its running, only on the load and bass rich parts of a song. This is no longer a probably because what the brick provides is what i need.

but i still need to power the laser. The laser calls for 5v at most. but it does not specify an amperage. I don't know if 5A will damage the laser. So can someone tell if the laser will get damaged with all this power or if it will work. Also i would still like to lower the voltage from the 5v down to 4v. Is there a calculator type thing that Will be able to tell me what i will need from just plugging in the input power and the needed output?

thanks again

Hi VN,

Finally we get the info that we need to help you. The conflicting information has made it very hard to help you. OK, this power brick may do for the amp if you don't turn it up all the way. Since the 5mW laser is rated at 5V (per the add), 5V should not damage it. I understand that you want to be careful. You need to learn ohms law and the power formulas that responders here have tried to teach you. I will give it one more try.

Ohms law: I=E/R and R=E/I and E=I*R

power formulas: P=E*I and P=E²/R

Power is in watts, E is in Volts, and R is in ohms

So lets find out the resistance of the 5mW laser: R = E/I = 5/.005 = 5,000 or 5kohms.

Get yourself about a 1k potentiometer (100 ohms at the lowest) and connect the outer terminals to the 5V supply. Connect the laser to the wiper (the center terminal) and to one of the outer ones. Center the pot and plug in the power. The laser should have about 2.5V applied. Slowly turn it one direction to see if it gets brighter or dimmer. Mark your panel. That is all you should need.

Lets check to see if the pot is going to get hot. P = E²/R = 5*5/1000 = 25/1000 = .025W. For a 100Ω pot: P = 25/100 = .25 Watt. Most pots should be rated that high.

-S

oops, just re read what i had said. the power supply puts out 5v at 2A.

not 5v at 5a!

That laser module is designed to work with two AA or AAA cells (2.7 to 3.2 V):-

http://www.newwishlaser.com/english/productview.asp?id=467

Just make sure you only give it 3V and don't worry about the current.

and to power the projector project i think i will use this or maybe this?

to power the LED but take apart the brick and place it inside the casing for the projector. i would then also need to make a power supply for the fan and the 3.7 needed by the LCD screen.

i drew a picture of what I'm want