Washing machine EMI
Further to the DVD/CD player that radiated EMI (Mailbag June 2011), we just replaced our washing machine with a new one from the same popular NZ manufacturer. The old one was 11 years old and generated some EMI.
The new one is appreciably worse, generating continuous and varying mains-borne EMI that interferes with all AM radios in the house. I have connected a Belkin line filter at the wall socket plus a large DSE ferrite clamp-on filter where the mains lead exits the washer. The noise is maybe 10% less, if that.
This does not seem acceptable – one does wonder about the testing standards. Others must have experienced this and perhaps tried other solutions; maybe some of the many trans-Tasman readers?
Caution required with
flood-affected radio gear
I enjoyed reading the article on rescuing electronic gear after a flood (SILICON CHIP, June 2011). One thing did concern me though.
In the article he mentions a white powder which he believed was corrosion from a solder alloy. However, military radios often use beryllium copper in washers. While relatively safe in its normal form, it can be quite hazardous once it begins to corrode, when it becomes a white powder.
Comment: although beryllium may be suspected if there is a white powder, parts made from zinc or aluminium can also turn to a white powder when they corrode.
costly hearing aids
Further to Clive Singleton’s letter concerning costly hearing aids in the Mailbag pages of the June 2011 edition, I have bought two digital hearing aids, for $3200, supposedly with noise-reduction technology. Even though they work quite well in a quiet environment, if there is background noise or more than one conversation being carried out at one time, they are practically useless.
I also have Digitor MegaEars, bought from Dick Smith that cost about $13.00, which I use in my workshop at smoko time. This may not look quite as pretty but considering the price difference, they have a lot going for them.