Amplifier on the Ptero Board Author's Balanced Class D

New condition!
Cosmetically and technically 10/10

Ptero stereo. Rev 1_03.
Power 100W-4Ohm + 50W-8Ohm
XLR balanced - 1 pc
Inputs: RCA - 2 pcs
Has an output for two pairs of speakers with a switch.
The amplifier is fully balanced.
Yuri Ignatyev's board "S_Audio"
The amplifier also uses high-quality RG Nikitin.
The remote control and power cable are included.
The PTERO project is an implementation of an
amplifier based on a modern audio modulator, controlling
a highly integrated output bridge stage with a unipolar power supply TAS5342A. A feature of the architecture is the use of a virtual ground with a potential of about half Upyt for working with audio. The amplifier is fully symmetrical and balanced.

Unlike known amplifiers, the use of a bridge output stage completely eliminates the effect of pumping, in addition, no additional optimization of the switching of the output keys is required, the chip manufacturer has already taken care of sufficient linearity of the conversion. In this version, the PWM signal from the audio processor is fed to the input of the chip and is not corrected. When using a Purifi type modulator, with a feedback depth in the audio range above 70 dB, the distortion characteristics are proportionally reduced, in fact, the determining factor in the form factor is not so much the circuitry as the quality of the components and the correctness of the printed circuit board layout. It is necessary to separately indicate a very small signal propagation delay in the output stage, the measured result is 43 ns, the total delay comparator - power output is less than 65 ns! And this is taking into account the power transistors. This indicator is approximately 1.3-1.5 times better than the ET400 module and has a very favorable effect on the perception of sound. The use of the TAS5342A chip makes clipping impossible. The output stage is turned off before the limit. If the output signal amplitude exceeds the supply voltage level, the output transistors are turned off until the polarity of the output signal changes. Thus, the amplifier does not increase distortion to critical values, even at max. power, distortions do not exceed 0.002%

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