8900g voltage questions

[boosst]

i just mounted my 8900g tail servo and am afraid to plug it in. i couldn't find a step down so i went with the homemade version. i want to test it out before i plug it in. which two wires or the red, orange, and brown do i test for correct voltage. seems like my lowest over two wires was 5.2 something.
i read somewhere that you don't want to go a bit over 5.1v. they are only rated at 4.8. i just want to make sure i am testing this right and see what everyone is running them at. will it ruin the servo if voltage is too high? thanks

[Mike_117]

I used the homemade Radio Shack version.. part# 276-1101 Silcon Diode. I plugged it in to my mulitmeter and it only dropped to 5.4v..?.. but that was not under load so it's hard to tell. There are many of us that use this and have had no problems.

In theory it works. The 2 in 1's output is 5.8V.. using the diode foward voltage drop is.. -1.6V under load.

No issues have come up yet... Cleared it with a friend (electrical engineer) and he said I was good.

I am on here looking into how to use my rex450 11.1V lipo's into my 600n 2 in 1.. (Would like to fly all day and just worry about fuel.. Seems like I get about 2-3 flights of 7-8 minutes on the little 7.4v 1900mAh lipo).

[boosst]

that is a different radio shack part number than the one i was told to use. i used the diode with part #1N4001 inline on the center red wire. voltage dropped into the 5.2's testing on the red and orange wire.

[george0079]

You have it set up correctly

[boosst]

i am showing 5.81v before the step down and 5.21v after. just wanted to be sure. everyone says that is should be between 4.8 and 5.1 and i seem a little high. just don't want to damage the servo. thanks for the help guys.

[george0079]

5.2 will work great. I'm running mine on 6v. Have been for months... I don't recommend it, but I want to know how long it will last.

[TheBum]

The 4.8 and 6 volt numbers assume using NiCd or NiMH packs, which can have voltages in 1.2V multiples. I suspect there's some voltage headroom built into the design, so the servo shouldn't have a problem handling 5.2.

[Mike_117]

Sorry.. i was referencing RadioShack part #.. ....it is the IN4001 Micromini Silicon Diode. ..my bad..

5.2V ...does seem a little high, but runs ok. have not heard of any 8900's goin out with this setup yet.? so keep on truckin..

[Pinecone]

A fully charged 4.8 pack is up around 5.6 volts. So 5.5 is even fine.

[WayneBrown]

I've been running a regulated 6.0v with no issues for several months.