Aiwa CA-W30 buzzing/humming noise frome one speaker

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charly2k22

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Hello!

I recently bought an Aiwa CA-W30 boombox and everything is perfect except the left speaker: when connected to the AC power it sounds like a kind of constant buzz (right speaker is perfect, no noise). Guys, could you tell me why it is? when it's running on batteries, that buzz isn't heard, I would run it on batteries, but the 1.5v rechargeable ones are quite expensive (uses 9 type D's in total). Please, can you tell me an alternative?.

This is a link to a sample from the buzzing noise (the sound is amplified with Audacity, normal volume is -48db)

https://voca.ro/17CJzHNM6C5w

Thanks and regards!
 
hopey

hopey

Member (SA)
Are you sure it doesn't makes this sound with batteries. Some power supplies are noisy but this should happen in both channels. It's a ground loop try plugging in at a different part of the house or your neighbours. You can cut in a DC supply you world have to find the correct voltage.
 
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charly2k22

New Member
Yes, with batteries there is no background noise in either of the two speakers, I just checked it with the volume at maximum in Line-in (no device connected). It must be said that with the AC current option, the background noise in the left speaker is heard in Line-In, tape and radio indistinctly. As for the option of testing the radio in another house, the noise is also heard in mine, but I cannot guarantee that the state of the electricity in that other house is not the best either. The power required to power the radio from batteries is 13.5V in DC. Do you think it could be a ground loop problem? If I had to make it work with DC, what options do I have?
 
hopey

hopey

Member (SA)
It's probably a bad power cap easy to find should be next to the Transformer. You can connect a DC power supply to the battery terminals. Does it take 9 D cells? If so 13.5v Power Supply. It's better to use a slightly higher voltage but not lower. Go for 15volts. An old Laptop charger is perfect.
 
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Ponnijeya

New Member
You need to do some trial and error.
1) Swap the speaker
2) Check if there is a grounded wire to the metal frame of speaker and if that is broken.
 
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