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electech320ci
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Joined: Mar 09, 2006
Posts: 42
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 Posted: Mon Apr 27, 2009 11:10 am Post subject: Power Supply TomTom 720 740 |
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Hi,
I have just replaced my 720 with the new 740.
I also have a spare in car power supply that I used for the 720, and I was wondering if it would be suitable for the new 740.
Thanks |
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mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
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| Posted: Mon Apr 27, 2009 11:28 am Post subject: |
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| If the connector fits then it will be fine, some of the TT charger leads had the cable exiting from the rear rather than the side, these will not fit but were only supplied with the x30 units AFAIK - Mike |
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electech320ci
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Joined: Mar 09, 2006
Posts: 42
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| Posted: Mon Apr 27, 2009 11:46 am Post subject: |
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Thanks Mike for the info.
Do you have any idea of the output volage of these chargers. |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Mon Apr 27, 2009 12:04 pm Post subject: |
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| electech320ci wrote: | Thanks Mike for the info.
Do you have any idea of the output volage of these chargers. |
All USB chargers output 5 Volts DC, but with different current capabilities (i.e. some non-TomTom chargers may not be able to charge the TomTom very quickly).
Reading between the lines, if you are considering installing a cable for the TomTom permanently, DON'T just chop off the cigarette lighter adapter as the 12V feed will fry a TomTom instantly.
The easiest solution is to install a new cigarette lighter socket behind the dash and leave a genuine TomTom charger plugged into it permanently.
There are a few topics about it on the forum - HERE's one I did with Maplin part numbers. (Ignore the first paragraph.. that was for someone who had already cut the end off his charger!)
| mikealder wrote: | | some of the TT charger leads had the cable exiting from the rear rather than the side, these will not fit but were only supplied with the x30 units AFAIK - Mike |
I got one with my 720 too. Must say I prefer them and as I have that one permanently installed (running through an air vent grill) it's a real pain it won't fit either of the other models I might pick up for the day's trip! |
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falkirk81
Pocket GPS Verifier
Joined: Jul 07, 2006
Posts: 1649
Location: Newcastle, England, UK
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| Posted: Mon Apr 27, 2009 12:08 pm Post subject: |
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My go520 car charger has an output of 5V 2A
My go940 car charger has an output of 5V 1.2A
My XL/One car charger has an output of 5V 1.2A
Not sure why there is a difference in output, but there is!
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Tomtom GO 1005 LIVE
iPhone 12 |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Mon Apr 27, 2009 12:17 pm Post subject: |
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I suspect cost.... Less current supply capacity=fractionally cheaper.
I think if you get a replacement supply for an x20 now it will also be 1.2A (at least that's what TT have sent me, but that was a freebie).
I haven't seen any difference in performance or battery charging time as I always use the power sully anyway. |
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electech320ci
Occasional Visitor
Joined: Mar 09, 2006
Posts: 42
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| Posted: Mon Apr 27, 2009 12:25 pm Post subject: |
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Thanks for the replies guys,
It looks as if I will order a genuine one from someone who advertises on this site and also get the cigarette adaptor from Maplins. |
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philpugh
Lifetime Member
Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire
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| Posted: Mon Apr 27, 2009 1:22 pm Post subject: |
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| Andy_P wrote: | I suspect cost.... Less current supply capacity=fractionally cheaper.
I think if you get a replacement supply for an x20 now it will also be 1.2A (at least that's what TT have sent me, but that was a freebie).
I haven't seen any difference in performance or battery charging time as I always use the power sully anyway. |
You will find that the unit can use upto 2A @ 5V when very close to fully discharged - this is typical behaviour for these types of devices. The current requirements drop off as the battery gains charge.
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Phil |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1936
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| Posted: Mon Apr 27, 2009 2:42 pm Post subject: |
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For the record, the car charger supplied with my Go730 has an output of 5V / 2A "tip +ve".
electech320ci, Presumably you received a new car charger with your new 740, what doesit state on the rating plate? and how does that compare with the data on the old 720 charger?.
Does anybody know if the amperage required by the TT is regulated by the TT itself or by the charger?. If it is by the TT i would say that it was Ok to use the new charger so long as it was 12V in and 5V out. Check also that the "tip +ve or tip -ve" data on the chargers is the same.
Also, I have a plan to use up all of those semi-used 1.5V batteries that no longer have enough energy to power cameras or the kids toys etc. but still contain enough energy to warrent not being thrown away. The plan will only work if the TT self regulates though.
_________________
Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20. |
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mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
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| Posted: Mon Apr 27, 2009 3:10 pm Post subject: |
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| The voltage regulator is contained within the plug body that goes in to the ciggy lighter socket DO NOT connect a load of 1,5 batteries to the TomTom or you will create smoke and have a TomTom that can only be used as a paper weight - Mike |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1936
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| Posted: Mon Apr 27, 2009 3:56 pm Post subject: |
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mikealder, Many, many thanks for that.
I promise not to think like that again.
_________________
Garmin Nuvi 2599
Android with CamerAlert, OsmAnd+, Waze & TT Europe.
TomTom GO 730, GO 930, GO 940 & Rider2.
SatMap Active 10 & 20. |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Mon Apr 27, 2009 11:32 pm Post subject: |
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| philpugh wrote: | | Andy_P wrote: | I suspect cost.... Less current supply capacity=fractionally cheaper.
I think if you get a replacement supply for an x20 now it will also be 1.2A (at least that's what TT have sent me, but that was a freebie).
I haven't seen any difference in performance or battery charging time as I always use the power sully anyway. |
You will find that the unit can use upto 2A @ 5V when very close to fully discharged - this is typical behaviour for these types of devices. The current requirements drop off as the battery gains charge. |
Which unit though?
Your sig says you have a 720 and the original supplies for those were 2A, but I wouldn't have thought the x40 models have lower current requirements than the x20's (and the x40's definitely only have 1.2A chargers).
Also, so far, charging my 720 on the new charger hasn't popped the fuse. |
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