555 Timer PWM Audio Amplifier

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555 Timer PWM Audio Amplifier

SKU: 555 Timer PWM Audio Amplifier Categories: ,


555 Timer PWM Audio Amplifier


       The ubiquitous 555 timer IC handles audio signals in its own pulse-width modulation (PWM) way. Here, the 555 IC works in astable mode. The switching frequency can be varied from 65 kHz to 188 kHz. Selection of PWM frequency depends on the amplitude of the input signal as well as the load impedance. By adjusting VR1, you can ensure comfortable listening with low audio distortion.

Circuit and Working

  • In pulse-width modulation, the carrier frequency’s pulse width varies as a function of the amplitude of the input audio signal. Feedback capacitor C2 ensures faithful reproduction of the audio signal.
  • An output L-C filter is the common approach for a reasonable rejection of the carrier frequencies.
  •  Moreover, the speakers cannot respond to the high-frequency signal. They respond to the average DC level modulated with the audio signal that we feed in from the input. Of course, the audio quality is not as good as that of a professional system, but it would be definitely an amazing experience to listen audio through a 555 chip with room-filling volume.
  • Impedance matching at both the input and output is important. So an input-impedance matching transformer (X1) is used to match the headphone output of a standard CD player to the input of the 555 amp

Additional information

Weight 1.000000 kg


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