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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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 Posted: Mon Apr 21, 2008 7:50 am |
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There is nothing wrong with the osc circuit. Look at the netname.
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I just realized.  Sorry Matro and others.
The scheme is quite confusing. Lets assume the following:
1) This is not the right way to draw a not shown net.
2) It should start with a line ending with a labeled arrow.
3) "crystal" is a device name, not a net name.
4) Instead it should be named OSC1 and OSC2
Humberto |
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filipe.oliveira
Joined: 17 Apr 2008
Posts: 12
Location: Portugal
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| Posted: Mon Apr 21, 2008 7:54 am |
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ok.. the next time I will have this advice in my design
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filipe.oliveira
Joined: 17 Apr 2008
Posts: 12
Location: Portugal
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| Posted: Tue Apr 22, 2008 3:45 am |
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Hi..i again
I tried this advice but the problem don't disappeared..
but i change the capacitor C9 to 3300mF and after this it's work....
I made very tests and repair that if i change the polarity very quickly the problem appears.. then i have the problem if i change the polarity very quickly but if have attention this on program i could escape..
but i want the other solution.. 
ps: In my design the L298 at pin 1 and 15 are connected to the GND but i have connect to the Resistor?? |
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Matro
Guest
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| Posted: Tue Apr 22, 2008 8:27 am |
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Could you confirm that you have the NOLVP fuse in your code?
Matro |
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filipe.oliveira
Joined: 17 Apr 2008
Posts: 12
Location: Portugal
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| Posted: Tue Apr 22, 2008 8:30 am |
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| yes, i 've this fuse! |
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horkesley
Joined: 20 Feb 2007
Posts: 48
Location: Essex UK
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| Posted: Tue Apr 22, 2008 8:34 am |
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Hi,
Are you saying that with the motor rotating, you the reverse to motor without delay, then you have a poblem?
If so, it is good to wait for motor to stop before reverse.
I should imagine the motor stops with a lot of current flow, as it will be like a break.
Grounding pins 1, 15 is acceptable if you don't want current limiting or monitoring.
Regards
_________________
Horkesley Electronics Limited |
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Matro
Guest
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| Posted: Tue Apr 22, 2008 8:57 am |
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Does the problem appear in both positions of SW3?
Matro. |
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filipe.oliveira
Joined: 17 Apr 2008
Posts: 12
Location: Portugal
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| Posted: Tue Apr 22, 2008 9:16 am |
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| i didn't try this... but i want the motors runs at 12V |
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