19v 5A PSu

[Xenobius]

Hello, I would like to build my own Laptop Psu because the original one broke. Could somone kindly enough point me to a Circuit of a Fixed PSU which gives me 19v @ 5A ??

ALSO since a PWM Power Supply does not heat up that much, is it good for a Laptop??

thanks a lot


PS.. Speaking of PWM.. I have a motor which takes 24v @ 14A. Does anyone have a circuit to controll such a motor?? the supply of this motor is two large batteries with 12v each in series.

Thanks a lot.

Xenobius

[ante]

Hi Xenobius,

It’s not easy to design a SMPSU, are you sure you don’t want to try to repair the old one first?

About the motor; is it suppose to run in one direction only or must it reverse too?

[Xenobius]

Thanks for the reply buddy.
It should run only in one direction. and it i a DC Motor. Power is already supplied (2 large batteries) also when I connect them, it gives a hell of a kick start.

thanks a lot

[ante]

A simple 555 PWM circuit with couple of MOSfets will do the job.

[Xenobius]

A simple 555 PWM circuit with couple of MOSfets will do the job.

Could you kindly send me a link to a schematic that will do the job for the motor please?

thanks dude!

[ante]

Hi Dude  ;D

First from this site: http://www.electronics-lab.com/projects/motor_light/003/ with a bigger MOSFET and a good heatsink this one will work fine.
And here is another one which is made for 12V but could easily be modified: http://www3.telus.net/chemelec/Projects/PWM/PWM.htm
And one more: http://home.att.net/~wzmicro/3525.html

[Xenobius]

THANKS dude! Will give them a look and let you know  ;)

sorry took me some time to reply.. vb project giving me a head ache  :P