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njkevlani

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From: India

Registered: 2017-12-29

Posts: 5

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[Solved] Hiss noise in earphones when charger is connected

My earphone is hissing when my laptop is connected to charger. The hissing goes away as soon as I remove charger.

Laptop: Thinkpad T440s
Earphones: boAt BassHeads 225

Last edited by njkevlani (2019-03-12 09:17:20)

ugjka

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From: Latvia

Registered: 2014-04-01

Posts: 1,808

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Re: [Solved] Hiss noise in earphones when charger is connected

So it didn't happen on windows or some other os but happens on arch?

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njkevlani

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From: India

Registered: 2017-12-29

Posts: 5

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Re: [Solved] Hiss noise in earphones when charger is connected

Arch is only OS on my laptop. Will have to check it by booting into some USB stick.

ultraviolet

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From: Denver Metro, CO, USA

Registered: 2014-04-11

Posts: 14

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Re: [Solved] Hiss noise in earphones when charger is connected

i'd strongly suspect that's just due to poor electrical isolation or a low-quality dac in your laptop. all my laptops have at least some hiss through the 3.5mm output, especially with a rotational hdd or optical drive spinning. in your case, since it's just when the charger is connected, i'd bet your charger produces a fair bit of electrical noise. you could try adding a ferrite core or two to the cable between your charger brick and the laptop. there are clip-on ones available and they're pretty cheap.

Last edited by ultraviolet (2019-03-08 02:35:40)

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--ultraviolet
                         my Arch machines:
Len = Lenovo ThinkPad T61 | 3dot = Toshiba Satellite C655-S5125 | Helicoid = Lenovo ThinkPad Helix | Vladimir = Custom Desktop | many others

njkevlani

Member

From: India

Registered: 2017-12-29

Posts: 5

Website

Re: [Solved] Hiss noise in earphones when charger is connected

Indeed it was a problem with power supply. On changing the power source, It is not happening. Weird.

ewaller

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From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,793

Re: [Solved] Hiss noise in earphones when charger is connected

Do you have access to a oscilloscope?  Two credits says you have significant ripple on that 'bad' power supply -- probably at a harmonic of the switching frequency of the supply.  I'm guessing 12 to 15 kHz. (Not that I have heard those frequencies for years )

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njkevlani

Member

From: India

Registered: 2017-12-29

Posts: 5

Website

Re: [Solved] Hiss noise in earphones when charger is connected

I don't have access to oscilloscope at the moment. I don't think I'll have access to one in near future. Think for the suggestion though.