heating blanket noise

[segovia]

Hi

John - I think this is one for you, do your heating blankets buzz when the power is applied ?

John

[deadedith]

I downloaded Doc Watson's Deep River Blues into the blanket to cover up the buzz.

Just kidding - my overhead lights will buzz sometimes - could that be it?

[tippie53]

Somtimes they do produce a 60 cycle hum I don't know why but they do.

[segovia]

Thanks, never heard it before now

The blanket hasn't been used for about 18 months, just getting back into making stuff

John

[hummingbird]

Hi John

I get the buzzing also. However, it only occurs when I'm using the controller to control the current. If I switch it to full power with no resistance it does not buzz. It's possible that the buzzing is coming from the controller itself.

[tippie53]

the controller may be part of the cause . I use a VSI switch and I do have a blanket that buzzes on Var but it works. I will see what the supplier has to say.

[Darryl Young]

Maybe the noise is turning the blanket on/off while in variable mode to control the blanket temp. See if the frequency of the "buzz" drops when you turn the dial to a lower temp and if it increases when you turn it to a higher temp. If the frequency stays constant, then the noise may not be related to the on/off control. Just a thought.