| 摘要 |
A power supply and audio amplifier system including an audio amplifier system adapted to receive an audio signal (AD) which is supplied to an attenuator (70) which receives the signal and selectively attenuates the signal which is then supplied to a buffer (80) and filter circuit (90) to condition the signal. The attenuated, filtered, signal (99) is then supplied to a modulator (100) where it is converted to a square wave signal having a pulse width a function of the level of the audio signal. The square wave pulse signal is then supplied to a push-pull converter (110) to generate an alternating current signal which is supplied to the primary coil (P3, P4) of a transformer (T3, T4) an amplified output signal is supplied to a load (L) from the secondary (53A, 53B, 54A, 54B) of the transformer. The load characteristics are analyzed and a loading signal is supplied to a clipper circuit (220) which prevents the output from exceeding selected load limits. |
