LED bulb interference with radio reception
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- เผยแพร่เมื่อ 15 ก.ย. 2024
- The switchmode drivers used in some LED bulbs can interfere with radio reception. I take a look at one such bulb.
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Email: johnaudiotech@gmail.com
Thank You!
Great stuff as usual sir, i had a similar problem with a dodgy high power led lamp, you could hear the hiss a meter away, and even my scope could pick up a few spikeis from the emission of the crapy LED lamp, the sad thing is that i thought my scope had a poor noise floor, due to the harmonics emitted from the awful led lamp. Good work John please keep it up.
It seems that the FCC has given up protecting the analog radio bands. It's sad, but not surprising at this point.
Yet if you put up a fan transmitter it bleeds in over your neighbors, radio station you get in trouble. But you have a big building filled up with LED lighting FCC don’t care if your neighbors pick up interference from lighting
I was looking for a good video explaining why this happens but why did you feel it was necessary to disparage religion?
If we put our minds to it and design custom lighting power circuits, perhaps we can find a way to block all the god-bothering stations.
Amen, Lol !
This definitely needs further study.
Do they all use a special frequency, perhaps 666 on the AM radio dial?
Are they using a form of direct injection to reach their followers?
Perhaps there's a chip that get injected under the skin?
..... Find the transmission source and donate the noisy LED's
@@johncoops6897 ..... All religions know that if they don't get you by age 12, they are unlikely to.
Great video John! Thank you!
It would be interesting to see the difference with that capacitor.
I’m surprised the FCC isn’t raising Cane over this . As much as they hate an unlicensed radio station bleeding on over a neighbors, radio station
The battery leads are acting as aerials.
I would try a shunt capacitor as mentioned across the bulb terminals.
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If I was John, I'd seriously think about another cat or kitten !
Thanks John, i have collected many such chokes, salvaged from dead SMPS. Planning to do the same
Prophesy today, oh dear ! interesting stuff...cheers.
I’m amazed to hear a man your age and caliber speaking in an unkind way about Jesus. I actually had just subscribed to your channel and immediately hit all bell notifications and was wondering at the same time just what you think about Jesus. And God consistently answers my questions that way, it’s an amazing reminder of His sovereignty. Great channel, be blessed all the more in it☺️
You know, when(if?) they tested this for the FCC they might have been using power leeds that are shielded right up to the bulb in order to pass. This methos of testing doesnt take into account all the wiring. I have pretty bad electronic noise issues in my house - I think from polluted wiring - it is even worse because it is knob and tube so my wiring is made of giant loop antennas.
No way that this was ever tested for the FCC requirements.
@@johncoops6897if my big bulging full of LED lighting interferes with the neighbors radio FCC won’t care. But if my little radio station interfered with the neighbors radio FCC cares lol
THE LEDS ARE ACTING AS SOLAR CELLS... You can put MANY on a panel in S-P... The current is creating an interference field.
There is many LED bulbs that will interfere with your cable modem\catv signal from your ISP and cause signal leakage which causes issues to the entire neighborhood and your ISP should or will eventually show up and try to install ground block(s) and tell you that the signal leak is from inside your house because of bad catv connector, uncapped or bad splitter, non terminated or bad catv cable, bent cable etc. Meanwhile the problem may be a cheap led bulb when turned on will cause noise\hum interference on catv signals (egress) until turned off or removed
eplaced with a bulb that doesn't cause interference.
To easily find the bulbs in your house causing interference, plug a radio into any power receptacle in the house, put the radio on AM 520 or AM 530. Turn off all the lights in house, turn off tv's and other devices would be essential for best test method. You should hear a slight humming background noise sound, you might also hear a random ping tone. Then run around house to test each light switch 1 at time, if you hear a loud hum from the radio, then you know it's that string. So, then you remove each bulb from that string until the hum noise stops. Replace bulb with different bulb making sure the loud background noise from radio doesn't come back.
Why care?
1. FCC.
2. ISP.
3. Being blamed by 1 and 2.
4. Less RF in your life.
5. Letting the neighbors get what they paid for.
6. Helping your internet speeds be more solid.
7. Helping the local emergency radio channels be more clear.
All because of a lightbulb.
I installed LED bulbs in my garage door opener... Guess what stopped working... That's right, the radio controlled remote openers. Had to switch back to a tungsten style bulb for now.
This has been bugging for years. Try playing electric guitar in a house full of LED bulbs!
I ran into the same problem with those low voltage LED conversion lamps. Installed an inline EMI filter on the primary of the transformer, that helped but also had to rectify the secondary and filter the output. So I ended up feeding the lamps with DC instead of AC to keep them quiet. Not sure what a home inspector might say about all that sitting on top of a kitchen cabinet.
I use laptop power supply brick adaptor, they have better noise suppression.
if tesla got his way & wasnt murdered,,we,d all have dc,,not ac, bs..
I am eager to see what in that LED bulb causes the interference noise.
A nasty little switched mode power supply with minimal filtering to keep the costs down and fit into the relatively small bulb housing.
Why do they put a power supply when the input voltage for the LED bulb is already 12 VDC?
@@listerine-pr5lt LEDS are usually driven to a fixed current. Without a regulator, it would be far to sensitive to variations in the "12 V".
@@listerine-pr5lt Several reasons.
LEDs work on a constant current, not voltage so need at least a resistor. But that's inefficient if you're dealing with the amount of current you need for a bulb.
And LEDs need to be fed with the right polarity so again, that's at least a rectifier as the bulb and holder aren't polarised.
Finally, there are a lot of low voltage lighting installations that use just an AC 12v transformer for power - fine for an incandescent bulb, again no good for an LED. You're going to need a rectifier AND a smoothing capacitor now as well. But this will give a peak DC voltage of just over 15V (assuming a 0.7v drop across the rectifier diodes)
A solid state 'transformer' however will be DC at pretty much dead on 12V.
Add the whole lot of requirements together and you end having to include some kind of regulator that can provide the right amount of current for the LED from a relatively wide variety of input voltages, polarities and frequencies.
And the smallest and most efficient way of doing this is with a single chip switcher regulator.
The downside is they give out a lot of RF noise if they're not suppressed correctly.
There are probably some other good reasons too !
I want to do some videos on line noise too if I can clear some dogs off the bench. Skiing is wrapping up but now I have other issues to contend with, Mom is back in the hospital. Anyway, my challenge is with my X10 stuff. The old UPS I brought home actually works but totally blacks out nearly all X10 communication when plugged in. Bought something that might help.
I know you've had issues with some LED bulbs and X10. The protocol does not seem to have any resilience to interference. Sorry to hear about the downturn of your mom's health.
"...so that's one less good station to listen to." 😂
Nice video
Have any ferrite beads? Maybe one of those clip on ones? Put the wire leads back on and the bead, see what happens.
I'm in line with Leif, this is an FCC issue.
I had an LED spotlight that was knocking out TV reception. Ferites didn't seem to help too much for me but worth a try.
Depends on the issue. The ferrites should help keep the wiring from acting like an antenna but doesn't clean up the source. Also note the formula used for the ferrite - you might be using the wrong formula for the frequency of interest.
@@russellhltn1396 I went back and watched the video again, comparing the light with leads and.the light with just pins. It did seem a hair louder with the leads, but there were still power leads from the power supply, so you still had a pretty long length of radiator. When put through the choke, it was most definitely attenuated. Now a ferrite bead may be way off, but it wouldn't hurt to try. Still needs to be reported to the FCC with this video as support.
John, do you have a housing for the lamp that you could wire up on the bench to see if there's any additional shielding there?
Good video..
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Technology has gone too far. ..Unplug, and Disconnect..
Can a filter capacitor value be responsible for change in output voltage ? Suppose if a 12 volt 2 Ampere transformer is connected a 2200 uF capacitor instead of usual 4700 uF , will that result in increase or decrease in output peak voltage ?
Normally, No. Only if the original value was too low to adiquatly filter VS demand. John showed that in a video where he was able to get slightly more power out of an amplifier by increasing capacitance.
2- 2200uf in parallel are better than 1 4700uf, less Resistance . Rule of thumb is 2200uF per 1 amp of current
Thanks.
It also interferes with my garage door opener 😢
Connect the second coil in the opposite direction. Problem solved.
Why would you say playing a religious is unfortunate? You must be a Biden voter.
They can transmit signals and subliminal speech on these thing theu are also all microphones. U probably already know all this. But yeah I'm raking them all out my house. Question what about flashlights?
The thought of those old flashlights... maglight wasn't bad tho
They are not microphones, even if you knew how to speak RF.
If only it was something as simple as a LED lamp to rid the world of religion!
A shotgun?
Fm radio, LED light stations problem
Problem ok my fm radio
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a baba ba ba babaa indeed
Christ offers forgiveness for everyone everywhere. He'll forgive you if you ask Him to.🙏🏽
George Noory. lol
Ok fm radio station problem led tipe sound problem ok in Tamil meaning