Tim Crow Posted November 3, 2021 Share Posted November 3, 2021 Hall effect sensor wanted to repair a faulty gimbal. Does anyone have a broken transmitter with Hall effect gimbals, or a faulty gimbal to cannibalise? Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted November 3, 2021 Share Posted November 3, 2021 An array of sensors for that "arc" or an array of magnets, to trigger/influence one sensor ? Any part numbers on the sensor ? What make is the tx ? Can you post a picture of the sensor. If it's Futaba, ripmax may have a new sensor, but more like a new gimbaled stick unit. Quote Link to comment Share on other sites More sharing options...
Philip Lewis 3 Posted November 3, 2021 Share Posted November 3, 2021 You would also need to specify the voltage, some are 5V but some are 3.2V and a 3.2V doesn't work well with a 5V TX. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 3, 2021 Share Posted November 3, 2021 Banggood Sell FrSky hall effect gimbals Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted November 4, 2021 Share Posted November 4, 2021 hello Tim,hobbyrc sell a hall gimbal for £19.....is for the radiomaster tx,dont know if its any use for you. ken anderson...ne..1...hall effect dept. Quote Link to comment Share on other sites More sharing options...
Tim Crow Posted November 4, 2021 Author Share Posted November 4, 2021 (edited) The gimbal is for a Jumper V2 or Radiomaster TX12 transmitter - the gimbals are identical and I'm using a TX12. Looking at the spec it says; Supply Voltage (VCC): DC 3.0 ~ 3.5V Sensitivity: 2.50 mV/G Linear Output Voltage Range: 0.1- (VCC +0.1) V≤≤ Quiescent Output (TA =25°C B=0 G): 0.5 × VCC The actual small pcb is approx 13x7mm with the sensor plus surface mount biasing components. The sensor has 009 470 92 on it but I can't find any references via Google. It seems to fail after about 30mins so I'd guess it's a fault with the components rather than the wiring although I will try checking/resoldering the leads. The plug and leads look OK. The gimbals seem to be out of stock on the cheaper sites - I'm currently exploring getting an exchange but I'm not hopeful. That is why I was looking for a cheap fix and hoping to find an unwanted gimbal/sensor lying around that might fit. - attached is a picture. Edited November 4, 2021 by Tim Crow Typo Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 4, 2021 Share Posted November 4, 2021 There are quite a few On ebay Tim, would need modifying Quote Link to comment Share on other sites More sharing options...
Tim Crow Posted November 4, 2021 Author Share Posted November 4, 2021 1 hour ago, Denis Watkins said: There are quite a few On ebay Tim, would need modifying Yes I was looking at those and wondering . . Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 4, 2021 Share Posted November 4, 2021 It's in our modelling nature to fix stuff Tim, and you are on the right lines. I would double check that the loss of stick movement was not an inadvertent bit of programming as Hall sensors have so little stress on them. Either, we buy a new gimbal, or salvage parts as you tried to. If this is your only transmitter, you get under pressure to decide and find a fix. Am still looking out for bits as it is a simple fix then. Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted November 4, 2021 Share Posted November 4, 2021 (edited) Always fails after about half hour ? You should be able to suss out some of the wires, earth, power, output signal after signal conditioning on that board, a pulse train....a scope would be handy, dmm should be safe to use....just be really carefull you only touch one terminal/track at a time ! Joining two terminals accidentally could mean " frying tonight ".... Maplins is dead, there are other suppliers, but catalogues these days are online... Edited November 4, 2021 by Rich Griff Quote Link to comment Share on other sites More sharing options...
Tim Crow Posted November 4, 2021 Author Share Posted November 4, 2021 (edited) 2 hours ago, Denis Watkins said: I would double check that the loss of stick movement was not an inadvertent bit of programming as Hall sensors have so little stress on them. It first manifested as full rudder deflection on my Easyglider after 20+ mins which made for an interesting approach and landing, luckily a perfect touchdown. I suspected servo/receiver connection so unplugged/plugged etc and all worked. At that point I reduced the rudder throw which made the next fail after about the same flying time a bit easier to handle! I then realised I could check the transmitter display and this showed the stick input signal was the problem, not the channel output. As the Hall gimbals were £12 ea. from China via Teknistore I guess they're not top quality. I've swapped it out for the OE potentiometer gimbal and may stick with that. TBH I've been flying rc for 45yrs and never had an issue with pots but was lured into buying the Hall gimbals by the perceived better reliability and quality etc. so now I'm wondering if it was a mistake. I'm lucky it was rudder that failed not elevator or ailerons as I doubt that would be a landable situation. Edited November 4, 2021 by Tim Crow Typo Quote Link to comment Share on other sites More sharing options...
Tim Crow Posted November 28, 2021 Author Share Posted November 28, 2021 Update - Teknistore supplied a new one at half price. I then looked at the faulty one, removed the hotmelt on the pcb holding the three wires and found a dry joint which I resoldered. So now have a spare which I doubt I'll ever need (touch wood). 1 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted November 28, 2021 Share Posted November 28, 2021 Glad you sorted it Tim As you now know there is very little stress on the hall effect, and these should outlast your tranny. You know, next time, go straight for dry joints. Quote Link to comment Share on other sites More sharing options...
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