1792 réponses à ce sujet

[wowhik1]

I don't know

[firened]

Incredible.
Funny how nature do that.

[firened]

Because you soldered it, the low resistance could cause a too high inrush current.

For all the lazy people that used Dupont wires like myself, the added resistance seems just enough to reduce this inrush current sufficiently.

[garfield2142]

Ooh, interesting... I have lots of resistor values, from 10 to 1M ohms, around what value would you recommend?

[garfield2142]

I'll test with 10 ohms

[firened]

Maybe 0.05-0.5 Ohm.

Consider that, if the board has to be replaced, the soldering has to be repeated as well.

[garfield2142]

I soldered in 10 ohms and it turns on perfectly. I let it run for at least 10 minutes to see if I get any low voltage warnings. I don't think I have resistors of thar low value though

[firened]

50x resistors in parallel

Or a thin cable and calculate the resistance https://www.omnicalc...wire-resistance

[garfield2142]

lol... Maybe I'll try a thing wire coiled up next. Although the low voltage and turn-on problems are fixed with 10 ohms, when I turn it off, all of the servos freak out for about half a second. I suspect that it powers the transistor for the power distribution board just long enough to have power, but no valid signal

[garfield2142]

Hmm, still no luck with lots of cheap chinese jumper wires... I'll try to find a lower value capacitor.

[garfield2142]

I found a better solution: I connected the transistor to the 3v3 pin. Absolutely no servo movement while powering off. Thanks for the help, @fire_ned ! :3

[wowhik1]

[firened]

Defective BQ25895 IC under a thermal camera.

BQ25895_EN.mp4   8,33 Mo

[garfield2142]

Wow, 140 C in a few seconds, that could probably melt cables... Is that UPS from WallE?

[firened]

Yeah

[wowhik1]

I had something similar with my charger for 18650-type batteries. There was a chip that got really hot-I don't know exactly how hot-but it was hot enough to burn a finger.

[wowhik1]

Here's the board, I guess this is typical for it.

[Mike118]

I tested this one and it works but not " great " it only use 5v input and get hot quickly with charging current at around 1A or less.

[wowhik1]

So my choice wasn't ideal when I bought it.

But in my opinion, it handled charging the batteries perfectly well.

[garfield2142]

That's a perfectly fine charger if you don't plan to keep it on 24/7.