Others have mentioned a doorbell transformer.  I you are not the 
original owner and use a battery operated doorbell (like we do), there 
may be an unused doorbell transformer (or other unused things like TV 
preamps) attached to that circuit (like we had) , which describes the 
past two homes I've lived in.  I did build one new home and it's 
difficult for me to accept that we moved into that, 50 years ago.
 I have one circuit in this home, that is daisy chained through 5 rooms 
that can be a noise maker.  I need to hire an electrician to clean up 
the wiring through the whole house.
73 and Good Luck,
Roger (K8RI)
On 1/18/2016 Monday 4:52 PM, Gary Smith wrote:
<snip>
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