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Shield hack?
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Shield hack?

by snrk on Wed Apr 23, 2008 10:12 am

Hi!

Is it possible to modify your shield so that it handles higher amps by just changeing the H-bridges to 2x L298 ic's? I'm only after about 1,5amps, maximum 2. Is any other measures needed to achive this(change of capacitors etc)?

Thanks for your help with my maximum speed question, btw. A new download of the AF library solved everything.

/Per
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by adafruit on Wed Apr 23, 2008 4:01 pm

L298's dont have built in diodes
but you can 'piggy back' two SN754410 right on top of each other, that will give you 2 amps per motor channel.

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by darus67 on Wed Apr 23, 2008 6:22 pm

Do you need any heat sink if you do that?
"He's just this guy. You know?"
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by adafruit on Wed Apr 23, 2008 7:32 pm

only if it seems to need it
ie the temp of the package is near 140degF

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by snrk on Thu Apr 24, 2008 4:56 am

ok? so that mean that I only need to solder another SN754410 on top of my existing one and then just go for it? Or is it 2x SN754410 AND swapping my L293 -> L298 ?

Sorry about my lack of knowledge about these electronics. Don't know if I'm asking questions about obvious stuff here...

MVH Per

edit: Found this chip; the L293NEE4 (TI) which supposedly handles 2A max current. Could this be used as an alternative? Which component is the limiting one? The L293 or the SN754410?
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by adafruit on Thu Apr 24, 2008 12:23 pm

you should try soldering a SN754410 on top of the chips you already have

the other chips you mention are completely different packages and pinouts

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Please be positive and constructive with your questions and comments.