555 Amplifier Circuit - مدار آمپلیفایر با آی سی 555

The 555 can be used as an amplifier. It operates very similar to pulse-width
modulation. The component values cause the 555 to oscillate at approx 66kHz and
the speaker does not respond to this high frequency.  Instead it responds to the
average CD value of the modulated output and demonstrates the concept of
pulse-width modulation. The chip gets very hot and is only for brief
demonstrations.