user21522: I need some motor drivers that can control a DC motor with 10-15 A and 25 V. I can't find any shield that can do the job. I need to control 4 motors with these.
Can you suggest some models that are good with this?
And one more question: if a driver can control a DC motor in 2 directions, can it control 2 DC motors in one direction each?

user8033: We don't really answer "shopping questions".
You could contact several suppliers like Adafruit, sparkfun or maybe even Digikey, Farnell etc (ebay?).
If you search for: "15A dual h-bridge" you will find some motor drivers which should work for you.
If a driver can control a dc motor in 2 directions can it control 2 dc motors in one direction each?
Where are you going to use them for?
If you're only going in one direction, you won't need a motor driver.
An MOSFET (per motor) is good enough if you only drive one direction.
If you want both motors to be able to turn each direction, a dual h-bridge will do.

21522: <p>I need some motor drivers that can control a DC motor with 10-15 A and 25 V. I can't find any shield that can do the job. I need to control 4 motors with these.</p>

<p>Can you suggest some models that are good with this?</p>

<p>And one more question: if a driver can control a DC motor in 2 directions, can it control 2 DC motors in one direction each?</p>
 8033: <p>We don't really answer "shopping questions".<br>
You could contact several suppliers like <a href="https://www.adafruit.com/" rel="nofollow noreferrer">Adafruit</a>, <a href="https://www.sparkfun.com/" rel="nofollow noreferrer">sparkfun</a> or maybe even <a href="http://digikey.com" rel="nofollow noreferrer">Digikey</a>, <a href="http://www.farnell.com/" rel="nofollow noreferrer">Farnell</a> etc (<a href="http://ebay.com" rel="nofollow noreferrer">ebay</a>?).</p>

<p>If you search for: "15A dual h-bridge" you will find some motor drivers which should work for you.</p>

<p><strong>If a driver can control a dc motor in 2 directions can it control 2 dc motors in one direction each?</strong></p>

<p>Where are you going to use them for?
If you're only going in one direction, you won't need a motor driver.</p>

<p>An <a href="https://www.adafruit.com/product/1794" rel="nofollow noreferrer">MOSFET</a> (per motor) is good enough if you only drive one direction.
If you want both motors to be able to turn each direction, a <a href="http://www.ebay.com/itm/3-36V-Dual-15A-H-Bridge-DC-Motor-Driver-30A-for-Robot-Car-Arduino-Compatible-/171012036277" rel="nofollow noreferrer">dual h-bridge</a> will do.</p>
