新车间 [XinCheJian]

The simplicity of the circuit stems from the use of this cool oscillator: https://www.youtube.com/watch?v=rpGOKGrcpAk A sawtooth waveform at approximately 50Khz, with a nearly-linear ramp, is produced by the S9014 BJT. This waveform is approximately from 5v to 9v: The guitar signal is 200-300mV peak to peak, and the sawtooth is scaled to match this amplitude. Both the guitar signal and the sawtooth are coupled to 1/2 the supply voltage, with a potentiometer used to fine tune the overlap between the signals. Finally, both signals are fed into a comparator (LM311), and the output from this drives the gate of a MOSFET. A 10nF filter capacitor is added to the sawtooth signal to reduce oscillations caused by feedback from the speaker via the power supply rails. The large power supply decoupling capacitance also helps to address this: without it, spikes appear in the oscillator waveform, and wild high frequency oscillations can appear in the output. Despite amplifying essentially only half the waveform, and various other limitations, the sound quality is surprisingly good. See video of the amplifier in action here: https://www.youtube.com/watch?v=dJg_JTugldk]]>

§ 3 Responses to Super Simple Class D Guitar Amp"

• citypw说道：

  01/05/16 Tuesday 07:22PM

  RT @xinchejian: Super Simple Class D Guitar Amp https://t.co/BeGiPNWLoR

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• 新车间 [Xin Che Jian]说道：

  01/05/16 Tuesday 08:07PM

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• Yaowen Zhang说道：

  01/05/16 Tuesday 10:21PM

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