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Littlebee 20A ESC burns VTX?
#16
Thank you for the info.  The esc's arrived today.  I'll have to go through my caps and see if I have some that are the correct ratings.
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#17
Got home and the highest caps I have are 470uf 16V. I don't think those will work. I have to buy some new caps. My next question is is it OK to just buy a bag of 1000uf 25-35v and put them on the esc pads and the battery terminal? Or do I need to use 470uf 25v on the esc pads and 1000uf 25-30v on the battery pads?
I am running 3s now but expect to upgrade to 4s in the near future.
also is 1000uf 25v ok or should it be 35v or higher?
Sorry for so many questions.

Thanks for your help everyone.
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#18
25V will be good for 3s. It should be good for 4S also, but 35V will be 100% reliable when spikes hit hard. To be honest here, I use 25V on my quad (4s only) and so far it didn't explode, but the risk is yours - I supply regulated power to my FPV equipment so if anything goes wrong my gear is still safe. I use a cap only because my ESCs are particularly noisy (EMAX Lightning_S are suicidal).

One 1000uf cap on battery pads should be enough for whole system. If you really want to solder them to all ESCs, use smaller ones.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#19
I use these capacitors:

http://www.ebay.com/itm/10-X-Rubycon-25V...8Gm-hcGmYA

here are some long and thin caps:
http://www.ebay.com/itm/10pcs-470uF-25V-...Sw3YNXYMlS

A capacitor is just like a really fast battery or accumulator where the uF (micro Farad) is the measurement for how much current it has the ability to store or accumulate. So the voltage spikes from the ESCs get sucked up and stored in the cap, and distributed out on the power grid when there is voltage drops. This happens really fast and that is why the capacitors are so good at filtering the spikes. The larger the cap, the more current it can store.
The voltage just tells you how high voltage the capacitor can handle. I wouldn't worry to much with a 25V cap on 4s, but 5s, I would probably look for a 35V cap instead.
The low ESR capacitors are faster to suck up the voltage spikes than the normal capacitors, so the low ESR caps are better for filtering.
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#20
Thanks for all the very useful information.  Got some 1000uf caps on order.  Really appreciate the help.
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#21
16v caps are recommended to buffer 5v BECs, for example futaba sells 16v 1700uf caps for their stuff.

For 4s, as mentioned above, 35v is save.
For escs, 470uf is a bit of overkill though. Flyduino for example recommends 220uf.

Just the 2 cents i picked up elsewhere Wink
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#22
so on my build that i havent got yet waiting to get in mail is alien rotorriot frame with droneproz 2206/2300kv motors,littlebee 30amp blhelis esc,bluejay f4 with osd flightboard,ive got rotor riot fpv cam and tramp vtx im not sure if they do anything for possible issues with power surges to there builds im contacting them monday to see but if they dont what should i do for capacitors? i want my stuff to last a long time and cant afford more blowing up junk like used wizard x220 on ebay i got rippppped off the guy supposely flew before shipping and found screw loose and put long screws in motors and i didnt know and it shorted esc's and motor so i replace with littlebee 20amp and emax 2205 and flew it couple times no crashes and it seemed really weak even 4s and find that two motors on y axis is got bad bearings so yeh thats why im being cautious and i wanna fly very very bad so i ordered a droneproz to be built alien and got new radio coming frysky tarantis plus with x4 receiver so hopefully i can get flying soon. sorry long post would my alien setup handle 5s or 6s and if so what capacitors do i need and where to put? thanks
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#23
(05-Mar-2017, 04:09 AM)ftj_85 Wrote: so on my build that i havent got yet waiting to get in mail is alien rotorriot frame with droneproz 2206/2300kv motors,littlebee 30amp blhelis esc,bluejay f4 with osd flightboard,ive got rotor riot fpv cam and tramp vtx im not sure if they do anything for possible issues with power surges to there builds im contacting them monday to see but if they dont what should i do for capacitors? i want my stuff to last a long time and cant afford more blowing up junk like used wizard x220 on ebay i got rippppped off the guy supposely flew before shipping and found screw loose and put long screws in motors and i didnt know and it shorted esc's and motor so i replace with littlebee 20amp and emax 2205 and flew it couple times no crashes and it seemed really weak even 4s and find that two motors on y axis is got bad bearings so yeh thats why im being cautious and i wanna fly very very bad so i ordered a droneproz to be built alien and got new radio coming frysky tarantis plus with x4 receiver so hopefully i can get flying soon. sorry long post would my alien setup handle 5s or 6s and if so what capacitors do i need and where to put? thanks

Long post is good. Wall of text is wrong Tongue  . What is your question in there?

You are worried that you break stuff, yet you want to fly 6s? 6s means more power + more weight = more damaged stuff on crash.

If you feel your 2205 2300kv emaxes (what models? MT or RS?) are weak, check if your 4s packs aren't dying. I use only good batteries, but even they get noticeably weaker over time, especially if they are not handled well.

But if you want to go this route, just make sure all your equipment can handle 6s:
- get a good PDB, (ie. http://intofpv.com/t-demon-core-v2-3)
- put a cap on it anyway (http://intofpv.com/t-littlebee-20a-esc-b...0#pid10160)
- get motors that can actually handle 6s (some 2300 can, some will get hot), personally I wouldn't go for anything higher than 2100 on 6s. 5s on good 2300 is probably a better choice.

EDIT: If you are not sure what to use and are worried about burning something out, build a thrust stand to check amp draw between different props/motors. You will get answers to some questions after checking it yourself. Just keep in mind that in flight, you'll get about 30% smaller amp draw than on the bench, thrust will also be smaller.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#24
I wonder if a VTX or camera is connected to 5v and I use littlebee 20a or xm20a escs, I need to use a capacitor or not? I build a light quad and 3 grams is a lot to me to be sub 250grams
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#25
(30-Apr-2017, 11:35 PM)dukevah Wrote: I wonder if a VTX or camera is connected to 5v and I use littlebee 20a or xm20a escs, I need to use a capacitor or not? I build a light quad and 3 grams is a lot to me to be sub 250grams

If you are running equipment off a 5V regulator, the regulator will protect them from the spikes that the Littlebee ESCs produce.
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