Don Fry Posted January 6, 2020 Share Posted January 6, 2020 I have a charger that has an input lead that should be better than the one I use. It's a 5.4 mm jack , centre pin positive, same as a Futaba transmitter uses. What are these things called, so I can search for one. Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 6, 2020 Share Posted January 6, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 6, 2020 Author Share Posted January 6, 2020 Sorry cancel last, rubbish measurement, it's 5.5 mm. Sorted. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 6, 2020 Share Posted January 6, 2020 there are different sizes of centre pin with those DC power plugs, I think they are defined by that inner pin size, eg 2.1mm Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 6, 2020 Author Share Posted January 6, 2020 As I've just found out. As far as my eyes can guess, it looks 2.1 mm. It looks smaller than 2.5 mm. But it is the same dimensions as a Futaba charge socket. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted January 6, 2020 Share Posted January 6, 2020 According to this thread Futaba are 2.5mm, same as RS Components 5A ones. JR are 2.1mm, or RS Components 1A ones. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 6, 2020 Author Share Posted January 6, 2020 Thanks Bob, that makes some sense. I was wondering about passing the current through a 2mm pin. I think I will give the 2.5mm plug a go. Bottom line, if wrong, not bankrupt. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted January 7, 2020 Share Posted January 7, 2020 Posted by Don Fry on 06/01/2020 19:43:57: Thanks Bob, that makes some sense. I was wondering about passing the current through a 2mm pin. I think I will give the 2.5mm plug a go. Bottom line, if wrong, not bankrupt. Don what current are you considering for the jack plug ? They are not meant for heavy current and the center pin is not the weak spot ,it's the spring contact that makes contact with the outer part of the plug . I may be wrong but would suggest 3 to 5 amps max and check if it gets warm after extended use. Futaba only used them for under 1 amp for charging Tx's. Edited By Engine Doctor on 07/01/2020 10:01:57 Quote Link to comment Share on other sites More sharing options...
gangster Posted January 7, 2020 Share Posted January 7, 2020 Didn’t Futaba change the size somewhere down the line? More recent ones (last 10 yrs or so) Quote Link to comment Share on other sites More sharing options...
Jesus Cardin Posted January 7, 2020 Share Posted January 7, 2020 "gangster" is right! Futaba has 3 types of transmitter charging connectors depending on battery nominal voltage: one for 9,6V Ni-Cd/MH, one for 7,2V Ni-MH and the last, the thinner one, for 6,0V Ni-MH/6,6Li-Fe/7,4V Li-Po. Then 18MZ and 32MZ radios have particular charger connectors different to those mentioned above. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 7, 2020 Author Share Posted January 7, 2020 Dunno, the one I am using as a reference is on a newish multipug charging lead. But the measurements come off the charger socket. I am not in any huge rush, if the plug ordered is the wrong size, not the end of the world. Quote Link to comment Share on other sites More sharing options...
Jesus Cardin Posted January 8, 2020 Share Posted January 8, 2020 Don, for which Futaba transmitter is your multiplug charging lead is intended? Knowing the transmitter, perhaps I may be able of fully confirming the sizes. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 8, 2020 Author Share Posted January 8, 2020 Not for a transmitter. It's an input power lead for a 250 watt Reaktor charger. The plug I know fits the unit is marked Futaba, centre pin positive on the multiplug charge lead. No idea what transmitter it's used for. I am no longer a Futaba user. i can't use the multiplug charger plug, as is wiring won't be up to the loads. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 8, 2020 Author Share Posted January 8, 2020 Not for a transmitter. It's an input power lead for a 250 watt Reaktor charger. The plug I know fits the unit is marked Futaba, centre pin positive on the multiplug charge lead. No idea what transmitter it's used for. I am no longer a Futaba user. i can't use the multiplug charger plug, as is wiring won't be up to the loads. Quote Link to comment Share on other sites More sharing options...
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