A studant in need!!! - Electronic Circuits Projects Diagrams Free

your mum · 10th January 2005, 12:10 PM

Hello! Im a student in need of help!

Is there anyone that can tell me how to effectivly boost the output power of a L293D chip when its in conjunction with a PIC chip. my robot moves like a slug. I know one way is to stack them on top of each other or but i want to see if there are any altenatives.

Thanks

bloody-orc · 10th January 2005, 04:28 PM

first look how many amps your motor needs to run.

and be shure not to mesure the amps used in free run... try to mesure the real and maximum current your motor needs.

and then see if it stays under 0,6A.
if not then yes you need two (or more) chips stacked or need to construckt a new h-bridge.

firsthightower · 10th January 2005, 07:17 PM

HI!

i've added a drawing of an H-bridge that is controlled with any HIGH - LOW output. The 4 little chips (4427) just switches the voltage of the motor depending what the logic output of your Microcontroller is. However this drawing is in the topic : "How to control 9V motor with digital out".

goodluck.

a student.

your mum · 11th January 2005, 02:08 PM

Thanks for that!! i'll have a go.

But i need to concider other possibilities so does anyone know how to connect a L293D chip up with a ULN2003A chip to boost its power.

bloody-orc · 11th January 2005, 07:29 PM

nope uln can let less current through it then LM

500mA for ULN and 600mA for LM

if you put uln between LM and motor it will reduce the power

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10th January 2005, 12:10 PM	(permalink)
your mum	A studant in need!!! Hello! Im a student in need of help! Is there anyone that can tell me how to effectivly boost the output power of a L293D chip when its in conjunction with a PIC chip. my robot moves like a slug. I know one way is to stack them on top of each other or but i want to see if there are any altenatives. Thanks

10th January 2005, 04:28 PM	(permalink)
bloody-orc	first look how many amps your motor needs to run. and be shure not to mesure the amps used in free run... try to mesure the real and maximum current your motor needs. and then see if it stays under 0,6A. if not then yes you need two (or more) chips stacked or need to construckt a new h-bridge. __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.

10th January 2005, 07:17 PM	(permalink)
firsthightower	HI! i've added a drawing of an H-bridge that is controlled with any HIGH - LOW output. The 4 little chips (4427) just switches the voltage of the motor depending what the logic output of your Microcontroller is. However this drawing is in the topic : "How to control 9V motor with digital out". goodluck. a student.

11th January 2005, 02:08 PM	(permalink)
your mum	Thanks for that!! i'll have a go. But i need to concider other possibilities so does anyone know how to connect a L293D chip up with a ULN2003A chip to boost its power.

11th January 2005, 07:29 PM	(permalink)
bloody-orc	nope uln can let less current through it then LM 500mA for ULN and 600mA for LM if you put uln between LM and motor it will reduce the power __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.