This small and lightweight UBEC features a high efficiency switching mode BEC, providing better heat dissipation when compared to linear voltage regulation. The shielded PCB design and output EMF coil provide a stable, low noise voltage output. The HKU5 also features built-in reverse polarity protection.
It is just hot even without current draw. Heating behaviour is definitely worse than my other linear BEC. My usage was 4pcs of 12g of analogue mini servo. I think level of current consumption is not high to make big load on this UBEC. Even in case of hot condition, voltage output looks good. My guess is one of this twins UBEC maybe faulty. I will put two thermocouple on each unit and check the temperature differences. Those measuremrnt pictures will be sent to CS for claim.
Agreed waterlogged. A single servo even in bind conditions should not cause this alone but if one malfunctioning servo is drawing half the amp load than it is very possible to completely overload it with the additional servos. I do agree it seems that he has a malfunctioning unit. I was just throwing out something that should be considered and checked before tossing the UBC.
I do the same. Always good to have replacements on hand. I am a bit dissapointed with the problems indicated here. Seems this is the updated version of the UBEC I have stocked up on (the HKUS 5amp 5 volt) I have had great success with this one. I run 5 9g and 1 13g servo with it in my old eflite p38 for several years now without a hitch. Never a fail in any of the 12 planes I use it in.Happy Landings.
Thank you so much for all of your opinion
'No current draw' means No Connection of any number of servo.
Again! Heating is always presented regardless of current consumption.
1 faulty UBEC among thousnads normal one can make crash. I am NOT fortune guy among thousnads people. But HK & supplier of this products keep the mind of Reliability. And other RC pilot who is interested in this UBEC can be shared by my experience. I will make some temp. measurement picture and share it.
Thanks for your comment, waterlogged. Actually some pictures are mainly for people in CS. This faulty device case became a lessons-learn for me. More carefull check-up when I put new devices into my plane is necessary.
I wish your FUN & SAFE flight! :)
My one is too hot when I just put 3s.
I think such a hot condition is absolutely not normal in switching BEC.
Actually I faced 2 times of crash with this UBEC.
Do you know why too hot? And how to fix it?
Thank you for your feedback v_max!
I think you may know the internal construction of this UBEC. This is the two peices of ubec with parallel combine for increasing current capacity.
Thats the reason why it is too thick.
I will separate it and compare it. If one of them is extraordinary hot, I will try to exchange the coil unit (inside hexagonal black case...right?) at first.
what about noise and reliability because if it fail my quad goes braindead and just fall out the sky is there any way to minimize that risk Can a capacitor like the "turnigy voltage protector" help out
Low pass filter usually solve the problem with HF noise perfect.. Most switching becs has iron coil
(like this one).. and this coil works perfect as low pass filter. If you use ESC bec, then you can add the same filter ( just get any ferrite or iron coil in nearest electronics store) and pass esc control wires (whole banch) several times through this coil. The same coil works perfect on RX to FC connection to
protect RX from HF ripples (just paththrough all wires through a single coil). The extra capacitor will also be good addition connected to any free RX port.
Purchased three of these for ignition voltage regulator duty in my large scale gas planes, when paired up with the turnigy 2100 Lipo receiver pack, you can run an engine all day versus the 4 cell NiMH packs. Working great in my planes, the 3A version works great too, but is a little longer and slightly heavier, but cost less. Next order, I will order more for spares for future projects.