Wireless Computer/LED Light Interference

[Scilly Suffolk]

Does anyone know what blocks EMI?

 

[PpPete]

Lead?

 

[fossyant]

Move the lights, or wear a tin foil hat

 

[biggs682]

modern technology tsst

 

[HLaB]

Move the lights, or wear a tin foil hat

Lol I'm just watching Enemy of the State.

 

[the_mikey]

The problem is probably coming from the circuit driving the LED, if it's a modern LED driver it works by pulsing the LED on and off, changing the pulse width to give the appearance of being 'dimmed' or 'brightened', however the probem with this is when any electrical circuit is turned on or off, the transient stage between off and on creates a broad band pulse of radio noise, and potentially the same happens when it is turned off. Two solutions: Buy an LED lamp that does not cause this problem, or modify the existing lamp, if you're able to.

A very small value ceramic capacitor across the supply to the LED may just be enough to reduce the noise without affecting the operation of the lamp, too big a capacitor and it may just cause the lamp to run too bright, or worse. Personally I'd just get a different lamp.

 

[Scilly Suffolk]

Thanks all.

As it seems to be a fairly common problem, I was just thinking that there is a market for a shield of some sort.

Next stop: Dragon's Den...

 

[fossyant]

Depends upon the light. I have a Cateye Double Wireless sat in the middle of 2 x Hope 1's either side of it and don't have any problems what ever setting the Hopes are on (and there is a Knog Toad right next to the computer).

Worth changing the channel that the computer uses (if it can change).