Did you know that it turns out that IC555 can be used as an amplifier circuit? However, this amplifier operates similar to a pulse width modulation circuit.
The circuit shown in the picture is designed to operate around 66kHz and the speaker won’t be able to respond to this high-frequency response.
Thus this amplifier circuit only demonstrates IC555 which is used as an amplifier that operates on pulse width modulation. Please note that this amplifier cannot operate for long because IC555 will experience heat.