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Futaba type transmitter charging plug

What's is official name

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Don Fry06/01/2020 16:57:52
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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.

Steve J06/01/2020 17:13:10
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2063 forum posts
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Try variations of 'barrel power jack'.

Don Fry06/01/2020 17:14:17
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4557 forum posts
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Sorry cancel last, rubbish measurement, it's 5.5 mm. Sorted.

Bob Cotsford06/01/2020 17:37:06
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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

Don Fry06/01/2020 17:45:27
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4557 forum posts
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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.

Bob Cotsford06/01/2020 19:30:18
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According to this thread Futaba are 2.5mm, same as RS Components 5A ones. JR are 2.1mm, or RS Components 1A ones.

Don Fry06/01/2020 19:43:57
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4557 forum posts
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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.

Engine Doctor07/01/2020 10:00:11
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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

gangster07/01/2020 11:50:50
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1041 forum posts
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Didn’t Futaba change the size somewhere down the line? More recent ones (last 10 yrs or so)

Jesus Cardin07/01/2020 12:20:17
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22 photos

"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.

Don Fry07/01/2020 12:23:18
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4557 forum posts
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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.

Jesus Cardin08/01/2020 08:18:26
102 forum posts
22 photos

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.

Don Fry08/01/2020 09:55:24
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4557 forum posts
54 photos

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.

Don Fry08/01/2020 09:59:10
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4557 forum posts
54 photos

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.

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