<![CDATA[Hissing Noise from Loudspeaker]]>When I start/reset my M5Stack Fire I get an audible hissing noise. This is not the case with my M5Stack basic unit.

It's loud enough to be annoying. Is this a fault, or a feature?

]]>https://community.m5stack.com/topic/1299/hissing-noise-from-loudspeakerRSS for NodeThu, 05 Mar 2026 20:05:02 GMTFri, 06 Sep 2019 21:52:12 GMT60<![CDATA[Reply to Hissing Noise from Loudspeaker on Mon, 09 Sep 2019 05:27:17 GMT]]>Due to hardware flaws, sometimes when interfacing with some of the units there is an audible hiss. Unfortunately since it is a hardware flaw the only solution is to use code to reduce the volume of the hiss.

in Arduino it should be something like
dacWrite(25,0)

Python
dac0 = machine.DAC(25)
dac0.write(0)

]]>https://community.m5stack.com/post/5534https://community.m5stack.com/post/5534Mon, 09 Sep 2019 05:27:17 GMT<![CDATA[Reply to Hissing Noise from Loudspeaker on Sat, 07 Sep 2019 18:01:02 GMT]]>Try to remove battery bottom and turn it on with usb power supply only (:

]]>https://community.m5stack.com/post/5519https://community.m5stack.com/post/5519Sat, 07 Sep 2019 18:01:02 GMT<![CDATA[Reply to Hissing Noise from Loudspeaker on Fri, 06 Sep 2019 22:01:02 GMT]]>I purchased this only a few days ago here in germany from your Partner firm Conrad, (under their own Maker Factory brand). The serial number sticker has faded badly in the 4 days since I bought it (bizzare!), but the number 0441 is still readable, if this is of any help in tracing the fault.

]]>https://community.m5stack.com/post/5505https://community.m5stack.com/post/5505Fri, 06 Sep 2019 22:01:02 GMT