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By having R1=10k and R2=380k the results have definitely improved. The result is a much smoother curve, but we some oscillations are still present in the curve. The circuit could be further improved with the use of a schmitt trigger.
Circuit 5: Using
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the non-inverting schmitt trigger
The model used for the non-invertive schmitt trigger was the 74LVC1G17SE-7 single schmitt trigger in a SOT-353 package
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Strange, there is a lot of noise during the falling edge of the output.
II repeated the test using C1=1000pf and 0.2uf but the results were the same:
I suspect that either, the configuration for this circuit is incorrect or the model of the op-amp I was testing (74LVC1G17SE) was inappropriate for this application.
Circuit 6: Using an inverting schmitt trigger
The inverting schmitt trigger was made using a TLV314IDCKR Op-amp. The schematic shows the configuration:
R1=R2=R3=2.2M, Vref=VCC=5v, VEE=GND
This configuration is an asymetric schmitt trigger configuration with two seperate voltages for HIGH and LOW respectively.
For this debouncing circuit, C1=0.1uF
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Definitely a far cleaner signal than the previous configurations. It should work reliably for any switch input. I decided to try different resistor values for the debouncing circuit. So far the results are almost identical:
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