Our friend from EmoeStudio https://t.co/f8MsdxBs7I just built this compact USB Hi-Fi DAC+headphone amp for laptops
features SA9227A interface + BD34301 DAC, 4.4mm balanced (7Vrms) & 3.5mm SE (3.5Vrms) outputs
1KHz SE THD –110.2 dB, THD+N –92.1 dB.
Pure Hi-Fi on the go.
EmoeDAQ-24,a high-precision data acquisition module supports scpi protocol over usart.
Test shows 0.1ppm maximum rms noise,and very precise measurement,comparable with 6½ DMMs.
I will continue programming the software...
Input floating noise floor test diagrams.I manually deleted some corrupted data caused by little kids jumping above my room...
It seems quit good.(1pA input, 10Gohm for transimpedance resistor)