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I don't know why, but everytime i or someone on the room next door switch off lamp, there is a loud pop coming from the speaker.

1) is that behaviour are caused by my amplifier (diy)(the line in cable doesn't have shielding,just 3 wire)

2) improper build of electrical installation in the building itself

3) my adaptor is bad? (i think it's just have big cap, resistor and 4 diode and a transfomers,the case is quite transparant though)

And how can i resolve this thing? Because it's quite annoying the noise is present whether connecting to laptop/phone or not

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  • \$\begingroup\$ Hi, a bit more detail please. Does this happen when the amplifier audio input is connected to a computer, to a phone, or disconnected? \$\endgroup\$
    – tomnexus
    Feb 17 '15 at 23:36
  • \$\begingroup\$ all of them, connected to anything or not \$\endgroup\$
    – aji
    Feb 18 '15 at 11:58
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Could be a defective light switch that is arcing internally, causing a whole heap of noise being introduced to the local circuit.

Otherwise, I would investigate some of the suggestions and answers referenced here. https://diy.stackexchange.com/questions/28049/whats-causing-the-popping-noise-from-my-speakers

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I didn't see enough information to rule out any of those, and all should be fixed. Of the three, only number two is likely to be fatal. I'd go and buy a 3-wire receptacle tester, and verify your neutral and ground are correct. You can probably pick one up for $10. Having these fouled up is dangerous, and will cause noise, among other issues (like death). If they are bad, get a qualified electrician to make the repairs.

Then, move on to number one, and get a decent shielded cable. These don't have to be the expensive gold plated (literally) ones. The lamp switch might be dirty, and causing a little spark. These are usually well contained within the lamp itself, and aren't dangerous, but the spark can be picked up by the unshielded cable.

Doesn't your "adapter" have a transformer too? I'd be surprised if it doesn't. I can't think how this might be involved with your noise related to a lamp switch, but you seem uncertain about it, so you might want to replace it.

Good luck!

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