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Reviews (9)
Aug 02, 2018
Doesn't obey voltage/current limits that are set. Not safe.
2 of 2 found this helpful NOT SAFE. It latches up and gets stuck oscillating between CV and CC modes. In this case it fails to honor the voltage and/or current limits you previously set. Furthermore, as another buyer has previously noted, (so these are problems with all units) when ever it is switched on, whether it is working correctly or not it generates a large amount of RF noise and can't possibly be FCC certified like the label it has.
Watch the video on vimeo described farther down in this message to see the problem.
Imagine buying a 12 volt power supply to run your portable radio and finding out that it burned up your radio because it sometimes decides to put out 21 volts instead of 12. That is the sort of problem with this power supply.
This power supply has a CV (constant voltage = voltage limiting) mode that limits the voltage to user selected value. It has a CC (constant current = current limiting) mode that limits the current to user selected value. Simply, the power supply must never let either current (amps) or voltage go over the selected values. It reduces power until both limits are satisfied. The user does not choose which mode it runs in. It does it automatically.
It's a design defect. The problem is that the power supply decides which mode to run in and only should ever run in one mode and there is no way possible for a user to set this up wrong. It's like day mode and night mode in an automatic camera. The camera decides and it should never be both. Saying the user is at fault for running both, when the camera decides which one to run is just silly. If seller would watch the video he would see that first it is working, then I simply disconnect and reconnect the load (imagine your radio here) and suddenly it has gone crazy and is putting out more current than it is set for.
Video 280858947 on vimeo shows that the circuit inside the power supply goes crazy.
Current limiting is set to 0.85 amps as proven in the video. The power supply is running correctly, in CC mode at 0.85 amps. I simply disconnect the load (a simple light bulb for a test) and reconnect it and the power supply is now allowing 1.5 amps of current with no changes made to the knobs or load. See the glow from below at 1.5 amps? That is the light bulb glowing brighter (imagine smoke coming from your portable radio). Even if the load was changed it should still not allow more than 0.85 amps as the knobs are set. Both the CC and CV lights are lit which should be impossible.
Further, when it is in this impossible state, there is about 0.7 volts of noise on the power, which is out of listing specification (≤ 1 MVRMS(RMS)) by a factor of 700 times (70000%).
Further, when it is switched on at all, my RF (air wave radio frequency) power meter sitting next to it goes to max scale so there is no way it passes FCC certification (sticker it has on the back).
I used the idea of a portable radio for an example but this particular issue would be the kind that would burn up a constant current device, like a string of LEDs. I've described an over current problem that I found. It's quite possible there is a similar problem with over voltage that would destroy the portable radio. I'm not keeping this power supply to find out.
Jan 18, 2017
Fits very well
I like the way these fit much better than the other common eBay style.
I use them for better vision in low light.
Mar 03, 2017
Works OK, not perfectly still, but a good "first gimbal" at the price I paid.
I haven't had any problems in about 10 uses / 40 days, but I haven't crashed it either. I suspect that the small circuit board on the very bottom is vulnerable to crash damage. I even had it stalled out bound up inside a protective bag (forgot to unplug power) for a whole flight (I don't always use it).
You do have to carefully balance the gimbal by moving the camera on the mount. Otherwise it can't stay level because it is very weak. All brushless gimbals are that way.
Even when sitting still with motors off, it jumps a tiny bit. It doesn't seem to hold perfect level, but you have to look closely to see it in the video (if the camera / video scene is moving). It might be possible to adjust some / most of this out. I have not changed the settings from stock values.
I think it is a good "first gimbal", well worth what I paid. Since the price has gone up since then, I would have to search and compare again before buying at the higher price.