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I want to measure the hight of a very short voltage peak using an analog input It does not have to be very exact. the duration of that peak is between 1 and 2 milliseconds, is it possible to extend the duration a bit using a capacitor? obviously it won't be parabolic anymore but that is not a big problem, the only requirement is that it is gone after about 50ms is this doable?

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  • \$\begingroup\$ Hi! Welcome to the site. What did you mean about "analog input". \$\endgroup\$
    – Long Pham
    Aug 28 '18 at 13:22
  • \$\begingroup\$ The analog input of an arduino \$\endgroup\$
    – remcoh
    Aug 31 '18 at 7:37
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you can use a diode to stop the voltage from immedately draining out of the capacitor. but the diode will reduce the voltage a little.

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ thanks, reducing the voltage is not a big problem, only the relative voltages compared to other peaks are important! gonna try this! \$\endgroup\$
    – remcoh
    Aug 28 '18 at 11:55
  • \$\begingroup\$ @remcoh, how much effect this has on your measured voltage should be checked...if the source has a high impedance compared to the capacitor, it could read much lower than expected. \$\endgroup\$ Aug 28 '18 at 12:31

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