Comparator LM311

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segs

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Can anyone explain to me how LM311 is outputing digital signals to PIC?

Shema : **broken link removed**



Best regards,

Sega
 
segs said:
Can anyone explain to me how LM311 is outputing digital signals to PIC?

Shema : **broken link removed**

Best regards,

Sega
Click to expand...

hi,
Basically the Cap or Inductor under test forms part of an inbuilt oscillator, the output of the LM311 is a square wave running at the frequency of the oscillator.
The PIC counts the square wave pulses over a fixed time, from that its possible to calculate the Cap or Inductor value.
 
Tnx ericgibbs,

but I don't understand how LM311 outputs square wave. How the frequency of LC tank is transformed in square wave?

Best regards,
segs
 
Last edited:
segs said:
Tnx ericgibbs,

but I don't understand how LM311 outputs square wave. How the frequency of LC tank is transformed in square wave?

Best regards,
segs
Click to expand...

hi,
Look at this section of your circuit, I have used a LM393 comparator.

 
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