Tymphany Hk Limited

Sebastiaan De Vries

A dynamic boost audio system includes a booster circuit having a dynamically sliding power supply unit (PSU) capable of outputting power among a plurality of different power levels. The booster circuit is configured to identify a real-time audio level of an audio signal, and automatically adjust the power to the power level such that the audio signal is output in response to the real-time audio level.

Booster circuit including dynamically sliding power supply unit

An amplifier system includes a Class-D power amplifier integrated circuit (IC) that is nested inside a feedback loop of a low noise differential operational amplifier (op-amp).

Class-D power amplifier nested inside low-noise differential op-amp feedback loop

A pre-amplifier circuit including a microphone pre-amplifier stage with a direct injection (DI) unit that provides a high impedance source signal and a low impedance XLR connection operable without a line or mic switch.

Pre-amplifier circuit including microphone pre-amplifier stage

A digital-to-analog converter (DAC) circuit includes a pair of output stages, each including a DAC configured to convert a digital audio signal into an analog audio signal. A low-pass filter circuit includes an operational amplifier in signal communication with the DAC. The operation amplifier generates a filtered analog signal based on the analog audio signal. An amplifier network generates an amplified audio signal based on the filtered analog signal. The operational amplifier includes a feedback circuit path including a first node connected to the output of the amplifier network and a second node connected to the input of the operational amplifier. The amplifier network is electrically nested in the feedback circuit path.

High current low-cost DC coupled DAC follower low pass filter headphone amplifier

A switchless pre-amplifier input circuit includes an audio input connector that receives a first audio device operable at a first impedance and a second audio device operable at a second impedance less than the first impedance. A preamplifier circuit outputs a preamplified audio signal in response to amplifying a first audio signal generated by the first audio device or a second audio signal generated by the second audio device. The switchless pre-amplifier input circuit further includes a impedance selector circuit that adjusts an impedance at the output to reach the second impedance in response to connecting the second audio device to the audio input connector and to adjust the impedance at the output to reach the first impedance in response to connecting the first audio device to the audio input.

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Donggua Ling, China

Sebastiaan De Vries