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Old 4th March 2012, 06:53 AM   #1
diyAudio Member
Join Date: Mar 2010
Default Noise problem

I have a noise from speaker (ZZZZZZZZZZZZZZZ) when ever someone turn on the heater shower (like this Instant Water Heater Shower
I open the amp up and the toroidal transformers (CD player, DAC and Amp) are giving a hum noise when every that happen.

When the heater shower is off , it will be back to normal.

Is there a way to overcome this?

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Old 4th March 2012, 07:06 AM   #2
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Just to clarify the toroidal is normally quiet till you turn on the shower.
Is it a diy amp that you can more easily modify.
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Old 4th March 2012, 07:16 AM   #3
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Ya, normally it is quite. It is a DIY tripath amp.
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Old 4th March 2012, 08:40 AM   #4
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Try searching this site with " noise on transformer"

And/or go to
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Old 4th March 2012, 08:51 AM   #5
CBS240 is offline CBS240  United States
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Location: K-town
Suppose the heater takes power from the line asymetrically, that would leave a DC component on the mains. Torodial transformers do not like this and will buzz, partly due to having no gap in the core and a high flux density. Lots of folks use a DC line filter to prevent this. Search the forum for the circuit. There are other appliances that can cause this to happen, microwave ovens for one, & powerful SMPS circuits can also contaminate a local mains circuit.
All the trouble I've ever been in started out as fun......
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Old 4th March 2012, 01:44 PM   #6
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Thank you.
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Old 5th March 2012, 03:22 AM   #7
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After some search, found a few circuit that can be done pretty quick and I have parts for it Variations of DC Main Filter against buzzing Toroid Transformers - what is the right? post 80

I done up 4 caps (10000uf 16v) with a bridge rectifier, connect it to the power inlet to the amp. It didn't works, noise is still there when heater is on. I will order some parts to try the next one.
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