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The "Servo Amplifier" on-line tutorial reviews the operation of servo amplifiers used to drive DC and brushless motors. The complete tutorial with audio can be viewed at http://www.galilmc.com/training/webconf.html. The tutorial begins with a discussion of the power regulating methods, leading...

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  • http://www.nxp.com/documents/data_sheet/TFA9879.pdf
    The TFA9879 is a filter-free BTL class-D amplifier that uses a fixed frequency PWM modulation scheme (see the simplified application schematic in Figure 18). When the TFA9879 is idle (no audio input signal), the voltage across the speaker is 0 V …
  • A filter free class D audio amplifier with 86% power efficiency
    The offset appears as a small amplitude ripple voltage at half the PWM frequency, well out of the audio band. Fig. 3 shows the schematic of the class D amplifier with the new modulation method.
  • Efficient performance simulation of class D amplifier output stages
    Introduction A simplified schematic of a class D audio amplifier system is shown in Figure 1. … signal (analog or digital) is converted to a logic-level pulse width modulated ( PWM ) signal by a …
  • Determination of over current protection thresholds for class D audio amplifiers
    A simplified schematic of a class D audio amplifier system is shown in Figure 1. … signal (analog or digital) is converted to a logic-level pulse width modulated ( PWM ) signal by a …
  • Spectral Analysis of Randomized Switching Frequency Modulation Scheme with a Triangular Distribution for DC-DC Converters
    A common modulation scheme adopted in dc-dc converters is the Pulse Width Modulation ( PWM ) scheme, a scheme also commonly used in several other applications, including telecommunications and Class D audio amplifiers [1-3]. Figure 1 depicts the basic buck-type dc-dc converter schematic where the output voltage (Vout) is …
  • Novel power management of Audio Beam System with specific corrugated loudspeaker
    A typical class D amplifier is based on a technique called Pulse Width Modulation ( PWM ) to replicate the analog waveform with a high-frequency switching waveform which controls the on/off state of the MOSFETS. The schematic of Class D power amplifier for Audio Beam Loudspeaker is depicted in Fig. 5.
  • Build to Win: Power Electronics
    The first laboratory culminates with the design and construction of a 15 watt Class-D audio switching amplifier . A typical stu- dent-designed schematic is shown in Fig. 8. The circuit includes a PWM generator that consists of several key blocks.
  • Practical Arduino
    multiple buttons on one input, 99 output, 81 parts required, 82–83 schematic , 83 sensor resistance, 86–87 shield … allophones, 155, 158 buffers, 148, 161 commands, 154–155 PWM audio output, 145 reading status, 161–162 sound effects and tones, 158–160 status outputs, 146–147 speech output signal, 143–144 … fit status indicators, 146, 148 making line-level output cable, 149–150 on-board amplifier , 150, 151 quick …
  • Tutorial review: audio amplifiers in mobile platforms
    A schematic of a ferrite bead filter for use with a class D amplifier is shown in Fig. 16(a)); impedance and resistance versus frequency of a typical ferrite bead is illustrated in Fig. 16(b)). … spectrum modulation [22], output signal programmable edges slope, or new digital modulation of the PWM signal [21]. … to reduce peak energy in high frequency range without noise degradation in the audio band: a target …
  • http://www.nxp.com/documents/data_sheet/TDA8924.pdf
    The output signal of the amplifier is a PWM signal with a carrier frequency of approximately 350 kHz. … a 2nd-order LC demodulation filter in the application results in an analog audio signal across the … With the resistor value given in the schematic diagram of the reference design, the carrier frequency is …