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Thanks Shatruddha, this is the waveform from the simulation..
i've tried to calculate the value based on 2N3904 transistor datasheet, and simulate it again.. the top waveform is the input and the bottom one is the output..
I've designed my IR transmitter as picture attached and assembled the circuit. My input signal is 10V (peak to peak) sine wave and 500KHz frequency. Unfortunately the output signal I got is being clipped at top and bottom end.. I've tried to recalculate the resistor and capacitor value but...