katew

i am currently a student who is working on the h-bridge with L298 ic. This h-bridge is going to run 2 dc gear motor with 12v and 1.1A. I followed the circuit diagram from this website below.

http://www.dprg.org/projects/1998-04a/

However,this website didnt tell me what is the code for the diode. My friend recomment me to use either IN4001 or FR202. Which 1 will be suitable.
Is there anything i need to modify on this circuit diagram that i found?

ericgibbs

hi katew,
Looking at the link and knowing the size of your motor, I would say any general purpose 1Amp 100Vpiv rectifier would be OK. [1N4001]

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katew

thanks for the info...i will going to try it out...by the way..currently i dont have any microcontroller to test the h-bridge that i going to build. How am i going to test it with a function generator..i think of using 2 function generator to generate pwm signal. Will it going to work?

ericgibbs

hi,

The website text warning NOT to drive both sides of the 'H' at the same time are important, else you will damage it.

http://www.dprg.org/tutorials/1998-04a/

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Hero999

If you current limit the power supply then it's possible to do it safely but I wouldn't if that isn't the case.

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katew

then is there any other possible to resolve this problem? This is because i plan to use this ic to contol my both my motor to move forward and backward.

katew

than what am i going to do...actually i tried to use normal darlington h-bridge before i going to use L298 ic,then i found out that the darlington h-bridge will bring too much power losses compared to the ic chip..n the size is big compared to the L298 h-bridge..so please be kind to give me suggestion.

Nigel Goodwin

Yes, simply use it correctly, but (like almost any H-bridge) if you inadvertently switch it incorrectly you can destroy it.

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katew

if i wanted to add in resistor to the circuit,to protect the circuit. which part do i need to add in?

katew

hving problem with the circuit...not so sure what it is the 2 hole between the diode and the holes for the L298 IC

ericgibbs

hi katew,

Attached drawing marking the two holes you are asking about, are these
the two??

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Eric
"Good enough is Perfect"

PIC tutorials:
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katew

ya...is that 2 holes...

prasetyo

Hey I'm a new member in this forum.....

best regards,..

ericgibbs

hi katew,
From what I can see from the project data, these two holes do not have any components fitted, they appear to be artwork pads used as a transition between a 'wide' track and a 'narrow' track.

Normally the artworker would use a 'blind' pad [no hole] in this position, he appears to have used a 'doughnut' style pad [hole]

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ericgibbs

hi prasetyo,
Welcome I hope you enjoy the forum.

I would suggest that you examine the different forum topics/headings, so that you can post any future posts in the correct forum.
In this way, you will get the best response and attention to any questions you may have.

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Eric
"Good enough is Perfect"

PIC tutorials:
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Bill's: www.blueroomelectronics.com/