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Noise in the electronic equipment? #30510 10/21/03 08:10 PM
Joined: Dec 2002
Posts: 308
E
Edward Offline OP
Member
Why would a toaster (a resistive load) create a humming noise in the power supply of an stereo equipment? If it was a microwave i would understand but why a toaster?
Edward


Thanks
Edward
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Re: Noise in the electronic equipment? #30511 10/21/03 08:47 PM
Joined: Oct 2003
Posts: 31
C
Clyde Offline
Member
That sounds like a question I might have been asked when I was an apprentice. I'll be looking forward to reading the responses.

Re: Noise in the electronic equipment? #30512 10/21/03 09:42 PM
Joined: Aug 2002
Posts: 1,691
S
SvenNYC Offline
Member
Does the toaster have any ELECTRONIC components?

For example, some of the fancier toasters have electronic temperature controls to enable the device to consistently produce the same darkness of toast slice after slice.

Some toasters also have an electromagnet that holds the bread grills down when you press the lever instead of a mechanical catch hooked up to the thermostat.

You can tell when you're dealing with one of those when you unplug the toaster and try to press the lever down. It won't stay down. An old-fashioned conventional toaster would let you click the handle in place even if it's not plugged in.

Re: Noise in the electronic equipment? #30513 10/22/03 12:52 AM
Joined: Jul 2003
Posts: 394
B
Big Jim Offline
Member
How about a bad neutral somewhere. When the toaster is on, it puts "objectionable current" on the ground which the electronics don't like.

Re: Noise in the electronic equipment? #30514 10/22/03 11:32 AM
Joined: Oct 2003
Posts: 289
:
:andy: Offline
Member
if the toaster is controlled ba a triac, this could explain the noise.

Re: Noise in the electronic equipment? #30515 10/22/03 05:50 PM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline
Member
Same question as has been put for the amplifier on stage:

Does the hum sound like pure 60Hz AC line noise, or does it have a distinct high-frequency or rasping sound to it?

Re: Noise in the electronic equipment? #30516 10/22/03 07:45 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
Only a guess, but measure the voltage at the receptacle where the stereo is plugged in. When the toaster is used, does the voltage drop significantly at the stereo? The amplifier in the stereo might not like a low voltage condition for it transistors to operate in the region they like.


Ron
Re: Noise in the electronic equipment? #30517 10/24/03 01:58 PM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline
Broom Pusher and
Member
I agree with Paul.

What type of noise is being observed?;
Is it a "Predictable" pop?
Is it a string of pops and hisses?
Is it a steady hum?
Is it like a Dentist's drill?
Is it all of the above?

Predictable pops would be from the toaster's switch opening and closing.

String of pops and hisses would be thermostatically connected elements going on and off, and maybe sounds coupled from other sources.

Steady hum would be some type of reactive elements' coupling.

Dentist's drill would be Solid State control elements (or other stuff coupled to it).

All above could be anything!!! [Linked Image]

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

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