Timeline for How to remove low-level audio noise from an ATMEGA328p + LM386 circuit
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Feb 4, 2022 at 7:26 | comment | added | cody blanchard | I think this is probably correct. After some experimentation I found that the undesired noise was only occurring while sound was being emitted from the atmega. And at very low output (digitally attenuated), it was very distorted sounding. I'm using simple square and triangle waves so it can be hard to tell when they are distorted. I measured the voltage coming out of the atmega and it was about 1.6v, which would be about half of 3.3v (peak-to-peak). After the 2.2k resistor, it measured a little over 1v. Seems I need to cut this voltage down as you recommended. I will try and report back | |
| Feb 3, 2022 at 22:26 | history | edited | Bruce Abbott | CC BY-SA 4.0 | spelling |
| Feb 3, 2022 at 22:02 | history | edited | Kevin White | CC BY-SA 4.0 | added 460 characters in body |
| Feb 3, 2022 at 21:55 | history | answered | Kevin White | CC BY-SA 4.0 |