# PicoCalc speaker noise

**URL:** <https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590>\
**Category:** PicoCalc\
**Created:** [February 19, 2026, 10:12am UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590 "2026-02-19T10:12:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![terekgabor](https://avatars.discourse-cdn.com/v4/letter/t/278dde/32.png) [@terekgabor](https://forum.clockworkpi.com/u/terekgabor)\
**Post date:** [February 19, 2026, 10:12am UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590/1 "2026-02-19T10:12:37Z")

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Hi All,

When I switch on Picocalc I hear quiet noise continously from the speakers even if the volume knob is at minimum.

If I turn the knob to maximum the noise a lttile bit louder.

I really can’t remember if this noise was existing earlier or not. Maybe this is normal.

What do you think?

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**Author:** ![DigitalDreams](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/digitaldreams/32/16007_2.png) [@DigitalDreams](https://forum.clockworkpi.com/u/DigitalDreams)\
**Post date:** [February 19, 2026, 10:18am UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590/2 "2026-02-19T10:18:54Z")

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On battery - VERY quiet hiss from my right speaker when volume at min. At max there’s also a whistle in the right but only if my ear is to the speaker, the left a very quiet hiss. Not an issue at all…

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<div class="post-metadata">

**Author:** ![terekgabor](https://avatars.discourse-cdn.com/v4/letter/t/278dde/32.png) [@terekgabor](https://forum.clockworkpi.com/u/terekgabor)\
**Post date:** [February 19, 2026, 10:30am UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590/3 "2026-02-19T10:30:48Z")

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Yeah, maybe my ears became better 🙂

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**Author:** ![maple](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/maple/32/12677_2.png) [@maple](https://forum.clockworkpi.com/u/maple)\
**Post date:** [February 19, 2026, 6:39pm UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590/4 "2026-02-19T18:39:37Z")

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does it change depending on what firmware you use?

one common practice to do pwm audio on the Pico is to run the channels at a high frequency which then gets modulated by tweaking the cycle, so at all times it could be putting out noise if the firmware doesn’t turn that off while it’s not outputting any sound

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<div class="post-metadata">

**Author:** ![terekgabor](https://avatars.discourse-cdn.com/v4/letter/t/278dde/32.png) [@terekgabor](https://forum.clockworkpi.com/u/terekgabor)\
**Post date:** [February 19, 2026, 6:57pm UTC](https://forum.clockworkpi.com/t/picocalc-speaker-noise/21590/5 "2026-02-19T18:57:58Z")

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I just upgraded fw to some beta ones.

I can’t remember I have heard this before, so maybe fw is the reason.

Thanks.