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Ron~FordTech · 03-04-2012, 08:49 AM

I picked up a servo tester believing it would be a handy device to have. I have wanted to use it on several occasions already, but -- contrary to my expectations -- it requires a 3-wire power input which I do not have.

It occurred to me that the BNIP 7.4v receiver battery that I have on the way will have the right connector, but aren't I taking a bit of a chance feeding 8 -ish volts straight into the servo?!

UNLESS...

I wonder if the tester unit has a step-down circuit inside to lower the delivered voltage to 5.5 or so(?)

Can someone comment, please?

desertstalker · 03-04-2012, 07:27 PM

Quote:

Originally Posted by Ron~FordTech

I wonder if the tester unit has a step-down circuit inside to lower the delivered voltage to 5.5 or so(?)

Can someone comment, please?

Unlikely, i wouldnt use it like that with none HV servos. But it should be pretty easy to test, plug in lipo and test output voltage (assuming tester itself can handle 8+V).

Do you have an old ESC with build in BEC lying around? That plus lipo would likely work.

Ron~FordTech · 03-06-2012, 06:25 PM

No - I have nothing like that. I didn't think it'd be this complicated!

Any other ideas, please?

desertstalker · 03-06-2012, 07:59 PM

Cheapest way is probably to get a 4.8V NiXX RX pack and use that, or even one of those 4x AA holders and wire your own servo plug to it.

Ron~FordTech · 03-10-2012, 04:56 PM

If I insert a 3.5A/5.5 BEC between a LiPo and the servo tester it will step down the voltage from the battery to 5.5V, right? So that would work wouldn't it?!

desertstalker · 03-11-2012, 11:35 PM

Quote:

Originally Posted by Ron~FordTech

If I insert a 3.5A/5.5 BEC between a LiPo and the servo tester it will step down the voltage from the battery to 5.5V, right? So that would work wouldn't it?!

Yep

Ron~FordTech · 03-13-2012, 10:05 PM

Thanks! Apparently a SportBEC is under-powered (or under-rated) for installation into my 450 & my 550...so this will give it a job until I decide whether to pop it into my 250!

desertstalker · 03-13-2012, 11:07 PM

Quote:

Originally Posted by Ron~FordTech

Thanks! Apparently a SportBEC is under-powered (or under-rated) for installation into my 450 & my 550...so this will give it a job until I decide whether to pop it into my 250!

A BEC in a 250? no need for anything like that, the 2-3A linear BEC in any small ESC will work fine for a heli that small. Waste of space/weight.

Ron~FordTech · 03-14-2012, 08:05 AM

Thanks! I am still climbing the learning curve. But I'll get there!

03-04-2012, 08:49 AM	#1 (permalink)
Ron~FordTech Registered Users Join Date: Sep 2011	Servo Tester Voltage? I picked up a servo tester believing it would be a handy device to have. I have wanted to use it on several occasions already, but -- contrary to my expectations -- it requires a 3-wire power input which I do not have. It occurred to me that the BNIP 7.4v receiver battery that I have on the way will have the right connector, but aren't I taking a bit of a chance feeding 8 -ish volts straight into the servo?! UNLESS... I wonder if the tester unit has a step-down circuit inside to lower the delivered voltage to 5.5 or so(?) Can someone comment, please?

03-06-2012, 07:59 PM	#4 (permalink)
desertstalker Registered Users Join Date: Apr 2011	Cheapest way is probably to get a 4.8V NiXX RX pack and use that, or even one of those 4x AA holders and wire your own servo plug to it. __________________ -DX8 -MSH MiniProtos Stretched, SK720, DS95/DS95i, Hyp 4S 25C 2500mAh -MSH Protos Stretched, Brain, Hyp DS16/BLS251, 6S 3000mAh -Goblin 500, HC3SX, Hyp DH16/MKS980BL, Scorp 4015-1100

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03-06-2012, 06:25 PM	#3 (permalink)
Ron~FordTech Registered Users Thread Starter Join Date: Sep 2011	No - I have nothing like that. I didn't think it'd be this complicated! Any other ideas, please?

03-10-2012, 04:56 PM	#5 (permalink)
Ron~FordTech Registered Users Thread Starter Join Date: Sep 2011	If I insert a 3.5A/5.5 BEC between a LiPo and the servo tester it will step down the voltage from the battery to 5.5V, right? So that would work wouldn't it?!

03-13-2012, 10:05 PM	#7 (permalink)
Ron~FordTech Registered Users Thread Starter Join Date: Sep 2011	Thanks! Apparently a SportBEC is under-powered (or under-rated) for installation into my 450 & my 550...so this will give it a job until I decide whether to pop it into my 250!

03-14-2012, 08:05 AM	#9 (permalink)
Ron~FordTech Registered Users Thread Starter Join Date: Sep 2011	Thanks! I am still climbing the learning curve. But I'll get there!

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