As mentioned in my earlier post, at the same time as ordering the Dorman servos, I also ordered a batch of Feetech FT90R c/r servos for comparison. They cost twice as much as the Dormans (£30 for 10) but I figured with Feetech being an established brand, they should be worth a try. Unlike Feetech's older FS90R servo, these use digital control boards, so again in theory no messing about with resistors to find the dead band. Took six weeks on the Silk Road but they arrived yesterday and have just done some quick tests with one of them. Initial results are extremely promising.
![Image](https://i.imgur.com/SEZRqDW.jpg)
First obvious difference from the Dormans is that pcb is slightly bigger (10x20x3.5 mm) and the motor lugs are soldered directly to it. De-soldering was pretty simple though and you're left with nice big holes for soldering motor leads - and a big round hole where the end of the motor used to be.
![Image](https://i.imgur.com/aGFYeYn.jpg)
![Image](https://i.imgur.com/dkiZKch.jpg?1)
As before, tested by connecting to a Redcon 4-ch Rx & 6v NiMH and clipping a digital mulitmeter to the motor pads. This time however the results were perfect - clean 0v with the stick in neutral and +/- 6v at either end. Also tried briefly with a 2S LiPO and was reading +/- 8.2v to the motor, same as the battery voltage (the Redcon Rx is rated to 10V so need for a separate BEC). No sign of any drifting off the dead band, though I was only testing for a few minutes.
So... only tested one unit so far but will try to find time over the weekend for more comprehensive/destructive testing and do a proper write up.
Cheers,
Stuart