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I'm looking for a quick-and-dirty way of converting something close to a sine wave to a narrow pulse wave. Please see the image: a low bass note played through a broken transformer. I'm trying to re-create the effect, preferably using discrete components.

narrow pulse waveform

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    \$\begingroup\$ try 'Low pass filter + zero crossing comparator'. \$\endgroup\$ – nidhin Nov 19 '14 at 8:12
  • \$\begingroup\$ Yeah I was thinking of some sort of a zero crossing detector. But I'm not good at designing circuits and I haven't really found a simple low voltage one (preferably with transistor(s)). \$\endgroup\$ – Jari Nov 19 '14 at 8:31
  • \$\begingroup\$ It is very important to perform lowpass filtering (integration) prior to zero-crossing detection. \$\endgroup\$ – LvW Nov 19 '14 at 10:27
  • \$\begingroup\$ OK thank you! I found this circuit, a good one to start with? sound.westhost.com/appnotes/an005-f1.gif \$\endgroup\$ – Jari Nov 19 '14 at 12:06
  • \$\begingroup\$ You show an output waveform and clearly there are pulses but what is the stuff in-between - is it noise that you don't want or part of the input signal? Are the pulses coincident with a certain part of the input waveform i.e. zero cross of input or possibly the peak voltage? Are there in fact many pulses per cycle? I cannot tell because I can't see the input waveform. \$\endgroup\$ – Andy aka Nov 19 '14 at 13:14

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