i had a question from a customer today that i couldn't answer. what would cause a loud static popping noise on the speakers of a sound system every time a clothes dryer door opens and closes? i'm at a total loss. anyone have an answer for this?
If you are going to attempt a bypass capacitor installation, be SURE to use only AC line rated ceramic caps, with the proper UL classification markings. The AC line is subject to high voltage spikes, and the cap's dielectric needs to be able to withstand these, and if they DO fail, not to do so explosively.
I might consider doing something like this on my own appliance, but unless you are experienced in and insured for appliance repair, the potential liability issues would keep me from doing any internal "design modifications" on someone's dryer...
Re: noisy music system#23673 03/27/0303:39 AM03/27/0303:39 AM
EMI can usually be reduced by using quality shielded cables and connectors on the sound system, including the speaker wires. The audio cables act like antennae, picking up radio noise from other appliances, local radio stations, etc.
Re: noisy music system#23674 03/27/0303:46 AM03/27/0303:46 AM
When fitting a noise-suppression capacitor across switch contacts, it's a good idea to include a small resistor in series, otherwise the contacts closing directly across the capacitor can result in excessive arcing.
Typical values are about 0.05 to 0.1uF with a series resistance of 50 to 100 ohmns.
It's possible to buy a "snubber network" which has the RC combination fitted into a single package for direct connection across the switch. Such devices will be suitably rated for 120 or 240V AC,
Re: noisy music system#23676 03/27/0307:16 PM03/27/0307:16 PM