In
its most simplistic form an amplifier can be built with a single 555
timer. In this project, a 200mA of current capability is enough to drive
a small speaker, which makes it a good replacement for a low power
amplifier. But when more power is needed to allow listening music in a
small room then a high power stage needs to be added with it.
The
function of 555 timer is very much comparable to pulse width modulation
(PWM). The value of the component used in the circuit causes 555 to
oscillate at approximately 66 KHz. As we know, speaker does not respond
to this much high frequency. Instead it responses to the usual CD value
of the modulated output and explains the concept of PWM.
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