Which is Best?? // LC FILTER VS LOW ESR
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- čas přidán 25. 06. 2018
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LC Filters
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470uF
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ID: dj2938hd298hflahsknckdfhsidufh9398 - Věda a technologie
LC filter is on VBAT.
TOP LEFT: No filtration
TOP RIGHT: Vbat > LC FILTER > VTX
BOTTOM LEFT: Vbat > LC FILTER > VTX + CAM > Video signal through OSD
BOTTOM Right: Vbat > LC FILTER > VTX + CAM > Video Signal Direct
LC on vbat? So you are filtering everything directly from battery and then noisy components are added again, in case of my setup (Matek PDB - BlueJay F4 rev3). I mean, what's the use like this? What I do usually is put an LC filter on the 12v rail behind the BEC and put there all video stuff (except OSD, cause that's 5v and would need a cap or separate LC but another LC is a bit overkill, lol). That said I hardly have to use an LC these days. Only on a setup with a 12v VTX which cannot be powered directly from vbat (rmrc 1.2Ghz for example) and need to be filtered out, including cam. I'm just worrying about my OSD which can still cause troubles. It's a minim (non-micro). So now I'm thinking about capping the ESCs first. Frame is a modified ZMFR250 so there's space on the arms no problem.
I guess.. in case of an AIO there might be use to have the LC at vbat but the again I'm not using LC's on those setups. Like others said, ESC caps .. or better wraith32 v2/tekko32. Noise killers :D
So the LC filter goes in the VTX power line??
Great job rigorously testing all the equipment. It's nice seeing actual data coming off a scope rather than some second hand opinions.
Really nice results liked this a lot thanks for your testings
This is really interesting. I had a quad crash due to desyncs again and again. Couldn’t find the issue and took everything apart. The strange thing is that on other quads the parts separately still functioned fine... now hearing you I thought damn, I had an LC filter between my ESC and FC which powered everything else via VBATT. So I now think this LC filter was the issue. The ESC just got hammered with tons of additional noise and just reset itself mid air. This has cost me al lot of arms, motors, top and bottom plates!
I’m never going to use LC filters again!
But, I did have crystal clear OSD and video LOL
Thanks for this test ! I have last time build big LC filter 1000uF 50V + twice bigger coil as capacitor then was picture clear but it weigh about 50 grams :)
I used to have horrible noise, especially when i was on the throttle. I added two LC filters. One for my vtx and one for the camera. Cleaned up my video so good
YES, please check how the gyros react on voltage spikes and noise. I think this could be so important in order to improve the a smooth flight.
So LC filter does nothing? What is you ESC Protocol, PWM freq., timing, PID/Gyro KHz, set to? I get way more noise on Proshot1000 8k/8k than if I set DSHOT300 4k/4k tbut the feel and response time is just way better. Also, I've heard people using a coax cable on the video line that made a huge difference. Can you look into this?
Great work. Thank you for this work.
What do you think of this idea. Have a small 2s pack somewhere on the quad to power vtx camera and fc. The main pack would only power the escs.
Jameson Kruger in terms of clean video, that should work really well. give it a try and let us know how it goes.
I'm running a mini vtx5848 with 2 470uf low esr capacitors on the main battery leads, getting really bad video noise. had none when running a vtx03. I tried wiring a micro matek 12v bec to power the vtx but it made no difference. do you have any suggestions?
the noise I'm getting is thin diagonal lines across the whole screen.
So putting a low esr capacitor on my flight controllers 5v & ground will help my video feed?
Also if yes...do I install it on the cam 5v & ground?
I was just getting ready to purchase an LC filter thanks for the heads up buddy.
Just out of curiosity, what do you have the cam + wired to? When i had mine wired directly to vbat I had terrible noise and osd flicker(even with multiple caps)... soon as I threw it on a 5v it was clean af.
Awesome work!
Hi. So it is well known you should put the Cap near the battery. But would it make sense to put it between the 4-in-1 ESC and the flight controller?
Ceramic capacitor across a DC voltage works better for the purpose of sending noise to ground. Electrolytic capacitors are designed to retain a voltage level. Example, if you have an a.c power and you want to d.c it you use a full wave rectifier and a electrolytic cap to smooth the modulating dc. To minimise a spike from the a.c we would use a ceramic capacitor across the positive and negative pins to remove that spike. Look at a simple a.c to d.c regulator to see what I mean.
I'm working in an applied electronics area and the coils are always a pain in regards to electromagnetic emissions. Basicaly they become small antennas and usually are the main target for shielding. There is a chance that the flickers are actually interferrence between coil emitted em field and the video signal.
the system (ubec+leads+lc filter+cam+vtx) can resonate at certain frequencies and create even more noise.
I wold love to see this same test with fc, vtx, And cam after the lc filter
We need ultra powerful LC filter so we can power everything out if it ( even esc's
Nice drone mesh , why you do not put the fpv camera on seperet bench , or dampnig the camera that reduced some viberation in the imge , we can see more details on what you do
Qs , i have 4 esc t-motor 32bit with matek f405 std , i need the esr with this setup and what shoud i need 4 of 25v 470uf ? or 1 of 1000uf ?,, thanks 🙏
4x 470uF should have it running smooth.
I was thinking a schottky diode with a capacitor? It will only have about a .25 voltage drop. You stated earlier that you have a voltage regulator that suppresses the max voltage anyways. So it was just a thought?
These are old videos and I'm sure you worked out all the bugs since then!
Does noise comes over power lines on camera or video line? Can you power camera with external powere supply and try again without any filters?
Canonical LC filter is supposed to filter out signal in particular frequency range. All noise in frequencies above and below LC filter working frequency goes thru anyway. Low ESR capacitors as voltage level stabilizers are better anyway. Putting both camera and VTX after filter is obvious. Otherwise noise will come up either in camera output or in VTX - those both usually doesn't have built-in voltage filters. OSD flickers are the worst :( For builds with separate FC and ESC it is possible to put separate filtering for FC, but that may be hard. For very old builds where FC and OSD are separate boards with 5V powering it is possible to put separate filtering for 5V rail. Sometimes it helps. Otherwise solution will be low ESR caps on ESC's and battery pads or nothing :(
Do you have a circuit diagram of that large LC filter with IC and Zenner diode at back by the way? I would like to see it :)
make any difference if use the micro lcd filter by LantianRC?
I'm using 3.5 to 5.5 v all in one fpv cam so will you suggest a filter for it
I didn't catch were you were connecting the LC filter? To the vbat, 5volt or 12volt? Have you done a video showing how your test rig is wired, Perhaps you could show the connections via a diagram. I'm interested in where you have your probes hooked up. Great work by the way
LC filter is on VBAT.
TOP LEFT: No filtration
TOP RIGHT: Vbat > LC FILTER > VTX
BOTTOM LEFT: Vbat > LC FILTER > VTX + CAM > Video signal through OSD
BOTTOM Right: Vbat > LC FILTER > VTX + CAM > Video Signal Direct
Drone why you dont make videos about the fpv camera, i like your opinion , or just shotout about the best , alot of cameras out there i dont know what should i buy ,, we have limited budget so we can’t test them all .. i beginner so why i ask you that ..
Great video 👍❤️😍
Remember the time when all ESCs are bulky and heavy, running Simon K and such. All of them have 1 or 2 caps weld onto battery lead. Maybe that trend is coming back.
How about 220uf on each ESC and 470 or 1000 on main battery lead? Should save some weight and easier to install coz of smaller caps.
I completely agree with you, but implemented differently then the past. Look at these new WRAITH32 V2, they are coming with 1800uf on board using SMD caps and not those big through-hole caps from the past.
I would like to see Drone Mesh do some testing on your question, what is better? 470uf on each ESC or 1000uf on the main battery input. In cases of 4in1 builds there isn't an option for this. But.. Some of us still like the escs on the arms. :)
You are the best 😉
All right there my frend i have never had the problems u r shoing i have an omni bus f4 and it is geat so i run 2204 emax prity noise motors with 30a esc so i dont get eny nose like u r regenerating toke soon if u disagree
Thanks a lot - open my mind ….
One of your so-called filers is an active circuit: regulator + LC filter. That's obviously NOT an LC filter. You shoud state that so nobody gets confused. Such a regulator could create, because of the output filter, spikes in the input current thus creating the problems for the circuits in front of the "filter". You should be more careful...
I don't see how diodes would help anything it's all they do is block current from passing through it to my understanding that's what we use to make rectifiers in school
There's a kind of diode that will conduct in reverse over a certain voltage. So if there's a voltage spike it will allow electricity to flow through it to ground, bypassing any other bits further along in the circuit. Think it was either a zener or schottky diode but I can't remember.
Jason Reel if you exceed the PIV rating it's probably not going to be a good day LOL
Nah, they're made specifically to do that. Soon as voltage drops below threshold they stop conducting again.
Yeah, it's a zener diode. Google zener diode voltage regulator if you're curious.
dominic keen czcams.com/video/LXGtE3X2k7Y/video.html. Check that video out kinda explains. In a previouse comment I had suggested a diode between the motor and esc but I think between the power source and esc might be better. Also a shotky would work best I believe it is designed to work with higher switching speeds. I think afrotechmods explained in another video more about this I will check n see..I'm no expert and have not tried it my self so I have no idea that's why I asked.
LC filter killed my 4in1
That's really weird, dude. It shouldn't happen, but... You know how it is... Nature just don't care. 😐
“hammered” such a technical term!
I’m starting to see your oscilloscope as clickbait:-(
I’m starting to see your oscilloscope as clickbait:-(
“hammered” ....such a technical term?
Could you do a bit better explaining what/why “hammering” is going on? You should! Your lab is begging for a white board. Check out Bruce’s channel for some examples. Love what your trying to do:-)
I think your missing the point of the diod or LED. It's meant to be used in flyback mode. ie reversed. So (-) of LED connects to (+) preferably directly at the motor wire. This way the energy is consumed in lightning the LED and doesn't travel backwards through the ESC. IT BY NO MEANS WILL REDUCE EFFICIENCY AND DROP THE BATTERY VOLTAGE!!!!!,
Please, please PLEASE!!!!! Research flyback diode. People KEEP telling you to try diodes and LED's because you dont listen, and just keep testing cheap rubbish like generic LC filters which ain't going to do sh#t. LC filters are frequency specific and cant cope with the dynamic range of noise (frequency's - Back EMF) from the motors.
This is why BetaFlight has filters for different frequency ranges and also dynamic filtering. 👍
#15. :)
Your fricking intro is waaaaaayyyyyyyy toooooo loooonnnnnngggg - check you stats, you're losing eyeballs
First
Hey! The dislike-guy is gone ^^??? :D How about that :D hehe
He's here loool XD
There he is ^^ He was running late today ^_^ hehe
He really keeps the phrase 'Haters always gonna hate' up and going ;)