17A03-1 hissing noise

[chrisdias]

I just installed my expansion board (17A03-1) and hooked it up. all works fine, but this board makes a bit of a noise, where the main OPII doesnt make any.

Not a buzz, more of a hissing sound. Nothing is hot.

Anyone else see this?

 

[fabriziojoe]

I just installed my expansion board (17A03-1) and hooked it up. all works fine, but this board makes a bit of a noise, where the main OPII doesnt make any.

Not a buzz, more of a hissing sound. Nothing is hot.

Anyone else see this?

Wow-I thought it was just me!
My setup is hissing as well, but I have not determined what it is.
I am running one voice board (10A11), two expansion modules (10A06), two 16 zone output expanders (17A00) and one power hub (83A00) in addition to the Omni Pro II.
Perhaps it is the caps?

 

[chrisdias]

...
Perhaps it is the caps?

what are caps?

 

[TonyNo]

Generally, caps start hissing when they are drying out. Usually takes 10 years or so.

 

[fabriziojoe]

Generally, caps start hissing when they are drying out. Usually takes 10 years or so.

Perhaps it is the charger?

 

[pete_c]

No "hissing" here with only one expansion module (10A06) - but got me looking a how many conventional versus "metalized" caps there were in my panel or around it.

Around the beginning of the year I was testing a panel for installation with a "bad" PS and noticed the heat generated around the PS on the main board would have probably caused an issue long term with the conventional caps.

 

[chrisdias]

anyone have thoughts on how to debug the hissing?

i dont know if its an issue or not.

anyone from HAI able to comment?

thx,
chris

 

[zpollock]

I've heard the hiss in several Omni setups. Not sure what the cause is, but it hasn't proved to be indicative of any pending failure.

 

[Brian Yokum]

The hissing is normal. The 17A00 uses a switching power supply which causes the windings of the power supply inductor to vibrate slightly. This vibration is enough sometimes to cause a slight hiss.

 

[chrisdias]

The hissing is normal. The 17A00 uses a switching power supply which causes the windings of the power supply inductor to vibrate slightly. This vibration is enough sometimes to cause a slight hiss.

thanks for the info, this makes me feel better!

chris