Recent content by gmz_001

I'v made a test - Input filter reaction for square wave impulse. One with smd cap, another one with film cap. Can't see any inductance ringing in range of 100kHz. No doubt that there is difference at high frequency, but not in audio range.

I'v mounted 2.2nF np0 cap for LPF. Original cap is x7r. But there is no np0/c0g with huge value like 1uF for decoupling cap, maximum - 0.033uF. Have no chance to measure inductance of leads, not sure it is huge enough in compare with pcb trace inductance.

Volume difference caused by voltage divider by two R116/R117 (marking for one channel). Level up could be made by decreasing R116 value. At my case there is sound withoud mid/high range. At that case capacitor value could be measured without desoldering - ic make no notable error for measure...

I'v noticed low quality of analog input. D03 use PCM1808 for ADC. Cheap adc, but it sounds preety good at Edifier Rxxxx multimedia speakers. I'v measured ADC input filter components value. There is low pass filter with -3db frequency at 2.6kHz. That's the problem. Dont know, it is mistake from...