Hello house, Please I tried implementing this circuit, But after everything the output still reads zero.....what shall I do Please
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The transformer will saturate and overheat if the frequency is less than about 100Hz since it's a 9Vrms transformer and a squarewave has a large low frequency component generating the magnetizing current..................
But anyway, if you don't have an oscilloscope, slow down the frequency so that you can use LEDs in place of the transformer to verify the switching. If that works, speed it up until you can barely see flashing - this will be 50Hz or so - and see if the transformer works at this low frequency.