is this circuit diagram right??

Posted on September 07, 2005 at 16:14

1.st7538 datasheet says c_minus should be connected to vdc and c_plus to sgnd. but in this demo board , things seems just opposite. then , which connection is right ?

2.As R14 is 1kohm, what's the best value of R12 ? can it be more than 10kohm?

3.are c17 an c18 right ? can they work stably as they being not equal??

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