I want to ask about a 30 Hz (decaying square wave) underdamped bipolar square wave.Also this is used for demagnetization. The photo of the output is shown as below. Could you help me to construct? Any recommendations?

enter image description here

  • \$\begingroup\$ Is this an assignment? We help with those BUT not the same as for non assignment questions. || A decaying square wave would be unuseual. Damping usually implies a load removing energy from an oscillatory circuit and you'd usually expect a sinewave or similar. The shown waveform could come from eg an underdamped sine wave and a zero crossing detector and peak detector. THe relationship between input and output may be more complicated than expected. \$\endgroup\$
    – Russell McMahon
    Aug 18, 2021 at 11:17
  • \$\begingroup\$ THe term "underdamped square wave" is used in blood pressure monitoring but does not mean what you show here. \$\endgroup\$
    – Russell McMahon
    Aug 18, 2021 at 11:20
  • \$\begingroup\$ Once more :-) - you REALLY need to tell us the context and how that waveform was produced. \$\endgroup\$
    – Russell McMahon
    Aug 18, 2021 at 11:21
  • \$\begingroup\$ Why is the 2nd negative peak at -10 volts and not -9 volts? What's going on here? \$\endgroup\$
    – Andy aka
    Aug 18, 2021 at 12:36
  • \$\begingroup\$ If this circuit is underdamped sinusoid, how can I convert this circuit sinusoid to square wave? \$\endgroup\$
    – too6hort
    Aug 18, 2021 at 12:59

1 Answer 1


You could make this using a DAC with bipolar output, so you could make a breakout board using this IC.

Then you can program an Arduino to communicate with the DAC to tell it to output 12, then -12, then 10, then -10 and so on. That is the only solution I can immediately think of for making very square waves.


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