• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Status
Not open for further replies.
Hello, I have a power supply that goes in the wall charger from 220v AC or something to 12v 2.5A DC, but I want to decrease the 12v 2.5A DC to 12v 1A DC...
Can someone help me to tell how I get 12v 2.5A to 12v 1A?

Best regards Adam.
 

Pommie

Well-Known Member
Most Helpful Member
Whatever you are powering will take what it needs. No need to reduce anything. However, I don't understand the term "goes into the wall charger"!

Mike.
 

JonSea

Well-Known Member
Most Helpful Member
As long as the voltsge is correct, the current can be what you need or greater. The load will only draw the current it needs.

Think about plugging in a lamp. The same outlet can handle a 4 watt night light, a 60 watt general purpose bulb or a big 200 watt reader.
 

ClydeCrashKop

Well-Known Member
Most Helpful Member
Maybe he has a coil or something that gets hot at 2.5 amps and he wants to reduce the current. That is a legitimate question.
 

JonSea

Well-Known Member
Most Helpful Member
Since a constant current source isn't a usual thimg (but becoming moreso for LED lighting), and the original post didn't mention a constant current source, maybe it's best to assume horse not zebras and get too far a field.

I will bet the OP has dome device the specifies a 12v 1 amp power supply and he's worried about plugging in a 2.5 amp supply.
 

Daniel Wood

Member
My friend (while we were taking an electronics diploma) was on amazon for a phone charger. I said go for the 2A version. After a heated debate, we went for a more expensive 500mA version, and told me that he did not want to damage his phone while charging... :banghead:
 

AnalogKid

Well-Known Member
Most Helpful Member
Adam - why do you think the current needs to be reduced?

What is the device you are connecting to the supply?

Also, do you know if your supply is a linear of switching type? Can you post a photo?

Once we know the details of your application, the quality of some of the responses might change.

ak
 

ronsimpson

Well-Known Member
Most Helpful Member
Can someone help me to tell how I get 12v 2.5A to 12v 1A?
This is like a person with a 2.5 liter bottle of water. The person can only drink 1 liter of water. No one said you must drink all the water.
lol----------------------------lol
Remember when Mother said; "You can not play until you drink all your water and eat all your food". Mother is wrong. You should eat and drink the right amount and leave behind what you can not hold. Leave food for those "starving children in Africa".
What did your mother say to get you to eat too much?
 

KeepItSimpleStupid

Well-Known Member
Most Helpful Member
My friend (while we were taking an electronics diploma) was on amazon for a phone charger. I said go for the 2A version. After a heated debate, we went for a more expensive 500mA version, and told me that he did not want to damage his phone while charging... :banghead:
USB is crazy anyway. So, I bought a 2.1 A charger with a 12 V lighter and 120 V input with two ports.
One will charge my cell and the other won't. The cell charges at 500 mA. My GPS charges at 1.5 A. I can charge both items together if I plug them in a certain way. No mention of anything to that effect on the box.

I have one of those USB voltage/current inline meters to check.
 

ci139

Active Member
Adam - why do you think the current needs to be reduced?
it is not the current been reduced - but the output voltage - ever faster satrting from certain current - specified as the current rating of the supply
unless the load is (a sophisticated circuit) drawing as much as possible from input until the input voltage drops below certain margin
 

AnalogKid

Well-Known Member
Most Helpful Member
That is a switching power supply which means it has a well regulated output.

Why do you think you need to reduce the output current?

ak
 

crutschow

Well-Known Member
Most Helpful Member
You won't get an answer to yout question until you answer ours about "why do think the current needs to be reduced?".
 

JonSea

Well-Known Member
Most Helpful Member
As has been explained about, you can run your 12 volt motor on the 2.5 amp supply. It will only draw the current it needs.

See my comments above.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top