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555 Timer PWM Audio Amplifier

555 Timer PWM Audio Amplifier

+8253IC1NE555761++VR1100KR210KR1680ΩC1680pLSEC = 2HLPRI = 900μHAUDIOINPUTC5100μ35VC3100μX1LS11WSPEAKERC4470μ40VC222n+12V555 Timer PWM Audio Amplifier
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publish time: 2020-10-23
Circuit Everyday

The ubiquitous 555 timer IC processes audio signals in its own pulse width modulation (PWM) mode.The 555 IC works in unsteady mode here.The switching frequency can vary from 65 kHz to 188 kHz.The selection of PWM frequency depends on the amplitude of input signal and load impedance.By tuning VR1, comfortable listening and low audio distortion are ensured.

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