Electrical issue causing speaker hum

konsole

Gregzoll,

I respect your opinion due to your high post count on these forums, and you speak in a way that portrays knowledge on the subject. I'm not really sure if you think that LED bulbs are not dimmable period or that they just need to have some modifications to their electronics I dont know. Whatever your "fact" is, dimmable LED bulbs exist and I am almost completely certain the ones I have were advertised as dimmable. If they werent why would they have been working fine even when dimmed down ever since I bought them, and why would one bulb not flicker and dim down properly when the other bulb was removed?

On this page its listed as "Electricity Myth 7"
http://www.myledlightingguide.com/Ar...x?ArticleID=10

All the evidence suggest to me that the bulbs are dimmable and they arent the issue anyway

konsole

Does anyone have anything to mention about the speaker hum disappearing when the AC outlet is unscrewed from the wall? When I unscrew the 2 screws that hold the AC outlet onto its housing the speaker humming stops. Its when the screws are making contact with either the housing or the face of the outlet is when the humming occurs.

Does it sound like what Allan said about an issue with the grounding somewhere in the circuit, perhaps even right at that outlet?

If it sounds like that could be the issue let me know what to look for at that outlet or even one of the other outlets or switches in the area.

Yoyizit

No easy tests.

Early equipment failure is called Infant Mortality. Search on "bathtub curve".

gregzoll

You need to go back and read what I had posted before this. As I stated, LED bulbs need the circuitry to make them dimmable, they can not be done through a dimmer switch on the wall. Also has nothing to do with high post counts, I grew up around electronic circuits & electrical work, and have been doing this stuff for over 35 years. I know a little more how a LED works and again, they are either on or off, there is no in between.

As for the hum on the speakers, has to do with poor or failed ground, but if on the same circuit as the LED bulbs, yes the noise from not enough voltage going to the LEDS can cause the circuitry in the builb to put noise back out on the line.

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konsole

So my LED bulbs dimming on a regular wall dimmer switch is just an illusion?

Couldnt the necessary electronics be in the base of the bulb itself?

Just so everyone knows. The light flickering has been fixed. Turns out 1 of the 4 bulbs is having issues. It didnt matter were I put this bulb, it caused both itself and the other bulb next to it to flicker. Plus whenever the other working bulb next to it was removed, the flickering in the bad bulb would stop but it would also get considerably darker. The getting considerable darker didnt happen on any other setup with any other bulb.

I havent determined if this bad bulb is causing the speaker hum yet

konsole

I think I have determined that the issue is with the grounding on one of the AC outlets. Whenever I unplug my computer monitor from this outlet the speaker humming stops, and the monitor has a grounding prong. Since both the monitor and speakers are connected to the computer I also just tried disconnecting the monitor from the back of the computer (video card) and same thing, the humming from the speakers stopped.

Yoyizit

Not to beat this to death, but an LED datasheet will tell you that lumens out depend primarily on current through the LED and it's a pretty linear relationship but LED voltage is not a good predictor of brightness.

The LED driver circuitry adds another layer of complexity to this, though.