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Question about delay timer with LM339 comparator?

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samy555

samy555

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Hi
jb13851610841.jpg

Is it C4, C5 or both which control the time delay to ON the transistor?

Why R4 (3.9M)?
thank you very much
 
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Positive feedback, providing comparator hysteresis. Would work better with a series resistor towards C4.
 

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