You would have to find a way to detect the negative halfwave peak like Matt described with a comparator maybe and then have a MOSFET driver or transistor driver make the switching for the "A" part. The "B" could be triggered by the positive halfwave.
In the video it took a long time for the cap to rise in voltage, so either a very small cap is needed or the cap discharge has to be SCR controlled or by a timer set to discharge when the cap is full.
In the video it took a long time for the cap to rise in voltage, so either a very small cap is needed or the cap discharge has to be SCR controlled or by a timer set to discharge when the cap is full.
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