Xenobius Posted June 30, 2005 Report Share Posted June 30, 2005 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 Quote Link to comment Share on other sites More sharing options...
ante Posted June 30, 2005 Report Share Posted June 30, 2005 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? Quote Link to comment Share on other sites More sharing options...
Xenobius Posted July 2, 2005 Author Report Share Posted July 2, 2005 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 Quote Link to comment Share on other sites More sharing options...
ante Posted July 2, 2005 Report Share Posted July 2, 2005 A simple 555 PWM circuit with couple of MOSfets will do the job. Quote Link to comment Share on other sites More sharing options...
Xenobius Posted July 3, 2005 Author Report Share Posted July 3, 2005 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! Quote Link to comment Share on other sites More sharing options...
ante Posted July 3, 2005 Report Share Posted July 3, 2005 Hi Dude ;DFirst 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.htmAnd one more: http://home.att.net/~wzmicro/3525.html Quote Link to comment Share on other sites More sharing options...
Xenobius Posted July 9, 2005 Author Report Share Posted July 9, 2005 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 Quote Link to comment Share on other sites More sharing options...
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