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  1. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    @Otaku+, you are misinformed. All of the four DAC channels are used for TPA325x balanced inputs (pretty clever solution) and two of I2S inputs are used for the Bluetooth module.
  2. molexey

    3e Audio SY-DAP2002 Review (DSP Amplifier)

    You can use a CY7C68013A board just $3. ;) Another solutions is ESP8266 for control via wi-fi.
  3. molexey

    3e Audio SY-DAP2002 Review (DSP Amplifier)

    This is not a rotary encoder. It's a potentiometer with hard stops. The STM32 doesn't control volume, it is for LED indication. Look closely at the block diagram. The potentiometer connected to the ADAU via Auxiliary ADC Input.
  4. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Please PM me. I will share a project with loudness.
  5. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Because, together, together, because. :D Frequency response — 10 nF (20 kHz -1.3 dB) Frequency response — 6.8 nF (20 kHz -0.7 dB)
  6. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Referring to the data sheet: A 6.8 nF capacitor with a 470 Ohm resistor (which is installed) for a 50 kHz corner frequency. With 10 nF we get 34 kHz. I would install the 6.8 nF cap.
  7. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    With a LM4562NA op-amp the noise is gone.
  8. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    This sound from the capacitor in a snubber. Sound intensity varies with temperature. As the amplifier (the capacitor) warms up, the sound decreases. This sound also disappears when the power supply goes from active burst mode to normal mode.
  9. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Yes, I reinstalled it. I didn't take all pictures. The coupling capacitors C93, C86, C70, C69 are still there. The R_in resistors also still there. But the amp didn't start. When I removed R_fb 18K resistors the amp started up as usual. Thanks for the measurements. I understand this fact. But...
  10. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Absolutely not. The DSP was connected to the TPA3250 inputs.
  11. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Yes, it does. I'm not sure if this is a fake or a wrong operation mode.
  12. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    My friend got a SY-DA1002 Rev1.1 amp and he noticed exactly the same noise. He tried to bypass the opamp (input pins shorted with out pins) and the noise disappeared.
  13. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Done. But it was not easy. It is especially difficult to remove the cap near the USBi connector. Can I get compensation for this? ;) Time for DIY fun. Since the device has already been disassembled. I decided to change the 470 uF SMT caps to Panasonic polymer hybrid caps and 2200 uF ChengX...
  14. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    I opened the box and was very "surprised". After receiving I opened the amp and noticed the missing capacitor C136. I texted about this to the 3e Audio store. The answer was: “it is ok, won't impact the function.there is 3 pcs 2200uF”. Is it really Ok? Yesterday I had free time and I...
  15. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    No, I don't. But I don't have a pair of "golden ears". :D I believe the DSP gives much more like a room correction or a custom loudness. I'm going to do my own measurements of the SY-DAP1002 REV1.0 and some blind test with my friends.
  16. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Looks like a SY-DAP1002 with TPA3250 is slightly cleaner and ADAU1701 is limiting performance (-83 dB exactly as in the datasheet).
  17. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Yes. You need to buy a SigmaLink USBi or some CY7C68013A USB board like this https://www.audiosciencereview.com/forum/index.php?threads/3e-audio-sy-dapx002-tpa3250-tpa3255-dsp-amplifier.14315/post-453151
  18. molexey

    3e Audio SY-DAPx002 TPA3250/TPA3255 DSP Amplifier

    Built-in 15 Segment LEDs Ring for volume indicating and other UI etc. Unfortunately, this is useless for now. Because the volume potentiometer uses a linear (not log) curve. Another cool feature if the LED ring could indicate as a dynamic VU meter. I have re-created output block with the...
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