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i have problem with my output at secondary of high frequency transformer. It just show a spike only. I need a rectangular wave. Currently i'm using 20kHz frequency. Anybody can help to explain what happen in this cct. Thank you.
What is frequency of signal? Transformer can't "transfer" constant level signals; as you know it use variation of applied voltage (variation of magnetic flux respectively) to proper work and transfer energy in secondary winding(s). Maybe for higher frequency applied signal you'll see a more close square wave signal in secondary, but never exactly same wave like applied signal.