Hellow,

For a project I need an adjustable current source with a maximum output of 10A. This current will be used to make an electromagnet, the coil of the magnet has a resistance of 1,590 ohm, sow the maximum power will be around 16V.
I can't find any schematics of such a supply on the internet, can anybody give me some information on this?

Greetings!

 

If the resistance is 1,590 ohms, a 100v supply will pass only 0.06Amps.

To deliver 1 amp will need a 1,590 volt supply.

 

I believe the resistance is 1.59 ohms (USA notation) thus the need for 16V to get 10A.

Any standard bench power supply that will provide 10A at 16V will work. Many companies make such supplies. If you Google "10a adjustable power supply" you'll get many hits.

__________________
Carl
Curmudgeon Elektroniker

 

I know it is possible to buy such a source, but it have to make my own.
The LM3886 (LM3886 - High-Performance 68W Audio Power Amplifier with Mute) can deliver a current up to 11500 mA. But I don't think the circuit mentioned on the above page meets my requirements.
Can anybody help me with an alternative circuit?

 

I also need one for driving power LEDs.I found one which uses LM317 but it can can give up to 2.2 A max.So I am searching for other alternatives.

__________________
No one Dies Virgin,Because In the End Life F***s Everyone

Rikil Shah
B.Tech-2nd year,
Electronics Engineering
Sardar Vallabhbhai National Institute Of Technology,
India.

Currently working on ARM,AVR,PIC

My Official Blog:-www.rikil-svnit.co.nr

 

Use Google and look for high power led driver.....You use an external PNP power transistor to supplement the 317's current capability....See here...http://www.uoguelph.ca/~antoon/circ/ampboost.html

__________________
Eccentric millionaire financed by 'er indoors

 

thanx..that is simple and cheap solution......if we can use P-MOSFET than can have more current...and can you say what is max current we can get??

__________________
No one Dies Virgin,Because In the End Life F***s Everyone

Rikil Shah
B.Tech-2nd year,
Electronics Engineering
Sardar Vallabhbhai National Institute Of Technology,
India.

Currently working on ARM,AVR,PIC

My Official Blog:-www.rikil-svnit.co.nr

 

Experiment........Thats what it's all about....How do you think I learnt?

__________________
Eccentric millionaire financed by 'er indoors

 

Yeah thats true...:
now can you give me some idea about this idea..
how is a constant current supply made

__________________
No one Dies Virgin,Because In the End Life F***s Everyone

Rikil Shah
B.Tech-2nd year,
Electronics Engineering
Sardar Vallabhbhai National Institute Of Technology,
India.

Currently working on ARM,AVR,PIC

My Official Blog:-www.rikil-svnit.co.nr

 

Look at this sim. Its a place for you to start. Note the power dissipation in the FET and in the shunt. You will have to use a LARGE heatsink.

Attached Thumbnails

 

 

I think voltage is much less...I need to drive 3 LEDs in series so I need 12 V.
and I can't understand use of two power supply...

__________________
No one Dies Virgin,Because In the End Life F***s Everyone

Rikil Shah
B.Tech-2nd year,
Electronics Engineering
Sardar Vallabhbhai National Institute Of Technology,
India.

Currently working on ARM,AVR,PIC

My Official Blog:-www.rikil-svnit.co.nr

 

The first ...unregulated supply is like your battery....

The second is a control supply...vary it and you vary the current...fix the voltage at some pre-determined level and the current is fixed

__________________
Eccentric millionaire financed by 'er indoors