mamba max pro problem

Originally Posted by BrianG

I don't think it's necessary. The BEC capability is fine IMO for the types of vehicles it was designed for, and the size servo normally found in these vehicles.

I'm running a hs985mg in a mini ste. This isn't a high torque servo(172oz-in@6v) and without the wheels on it wouldn't be drawing many amps, but I still see voltage dropping below 4v. I had the bec output set a 6v. I'll lower it to 5.5v and then 5v to see what happens.

edit: just tried the 5.5v setting (dx3s reads 5.7v). with the truck on the floor, after turning the wheels 16 times from left to right, the bec drops below 4v once. did this twice with the exact same result. with the bec set at 6v the voltage would drop below 4v after about 5-6 turns.

[BrianG]

Originally Posted by sikeston34m

I wonder how much the BEC's amp carrying ability is affected by input voltage?

@Brian - What input voltage did you do this testing on?

I had it hooked to my PS unit, which is 14.75v.

Originally Posted by whitrzac

what I'v knowticed is...

spek RX+ jr 650 servo = RX low volt shutdown
spek RX + 617 bluebird servo= same thing...

BUT!! I'm starting to think that the MMp killed one of my spek RXs, it(RX) worked fine on thu when I used my RX8, but when I switched to the MMp it started to shut down and glitch

this was in a t4, 2s, 6.5


also the esc hit 120-130 with the fan not turning on...

The Spek receiver is pretty solid. I find it hard to believe it is dead. What I have noticed however is that they seem to be pretty sensitive to any noise.

Originally Posted by drkdgglr

I'm running a hs985mg in a mini ste. This isn't a high torque servo(172oz-in@6v) and without the wheels on it wouldn't be drawing many amps, but I still see voltage dropping below 4v. I had the bec output set a 6v. I'll lower it to 5.5v and then 5v to see what happens.

edit: just tried the 5.5v setting (dx3s reads 5.7v). with the truck on the floor, after turning the wheels 16 times from left to right, the bec drops below 4v once. did this twice with the exact same result. with the bec set at 6v the voltage would drop below 4v after about 5-6 turns.

Well, judging from my tests, I bet those servos are pulling over ~2A. It might help to put a capacitor on an unused servo channel, something like 10,000uF which will help provide that extra boosts when current spikes.

I don't have any problems when driving the truck, just the occasional 'beep' from the dx3s when voltage drops below 4v. It's ok for my 4.8lbs mini ste but I also want to use the mmpro in a 7lbs e-maxx.

edit: I'm running 6s