sdima1357 / stm32f401cdu6_audio Goto Github PK

View Code? Open in Web Editor NEW

61.0 9.0 12.0 7.23 MB

low noise low cost stm32 usb-audio dac with optional level meter

License: GNU Affero General Public License v3.0

C 99.25% Assembly 0.33% Makefile 0.42%

audio pdm stm32f4 usb-audio usb-audio-dac delta-sigma stm32 magic-eye tube-6e1p tube-6br5

stm32f401cdu6_audio's People

Contributors

Stargazers

Watchers

Forkers

czorgormez abuoro godzivan fedemille laot007 atlury 1847123212 cernohorsky lnrd-o felipegaspari alexeyavb jefkeb

stm32f401cdu6_audio's Issues

Schematics

I'm also trying to use a STM32 without a DAC to produce music.
I it is possible to have a schematic of the electronic, I assume you do some filtering and amplification?

There is implemented virtual software second order sigma delta adc for the shift quantization noise to high frequency. see here (it [provide useful links too at the end of document):

I don't understand, PWM output means to create a DAC converter, and the mentionned paper seems to speak about ADC conversion.

And finally how it compares to this?
http://www.openmusiclabs.com/learning/digital/pwm-dac/

Thanks.

pls answer some question

What is the difference between this git and the following git project?
https://github.com/sdima1357/stm32f401ccAudioNative
can i connect dircetly to the earphone (resistance about 32R)? PA8 to left earphone and PA9 to right earphone? can it play normly?
Can I use stm32 adc to sample audio (3.5mm lined mic, resistance about 2.2K). any suggestion to the circuit？