555 as the D power amplifier circuit

Published:2011/7/20 7:16:00 Author:Seven | Keyword: power amplifier | From:SeekIC

See as figure 5-44, IC(555), R1, R2 and C1 compose a controllable multi-resonance oscillator whose frequency is 100KHz, duty cycle is 50%. The control terminal 5-pin is added with an audio signal, then the output of 3-pin is a PWM pulse signal whose PWM is in forward proportion to the amplitude. After filtering by L and C3, an amplified audio signal is got.



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