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AC Adapter query
- Thread starter Marc
- Start date
Just plug it in.
What's the worst that could happen?
What's the worst that could happen?
blackprince
New member
- Jul 16, 2007
- 210
An adaptor rated at 24V 3A can deliver a maximum of 3A but it doesn't have to run at that maximum capacity. It's no different in that respect to a plug having a 13A fuse (max load 3.12kW) but the appliance the lead plugs into only drawing say 6A (1.44kW). However, the other way around try connecting an appliance taking 3.12kW from the mains through a plug with a
5A fuse (max load 1.2kW) and sure enough the fuse blows.
I think (but someone please correct me if I'm wrong) that auto switching regulates the voltage rather than the current. For example, my SNES *should* have a 9v supply but regulates this internally to 5v and can actually accept around about 18v input before the regulator packs up through overheating.
blackprince
New member
- Jul 16, 2007
- 210
Marc
As other posters have suggested does the unit that you will plug the 24v power adaptor into have a tolerance on its input voltage. For example can the input voltage range from 19.0v to 24v. I ask this because at the lower end of the example I have given, there is a huge range of laptop power adaptors that you could use which are relatively cheap. If there is little or no tolerance then to purchase an appropriate 24V adaptor is going to be considerably more expensive. I have just purchased a replacement adaptor for my wife's laptop from amazon which has a 19v 3.9A output. It cost £16.16 including p&p.
Looking at a few websites for a dedicated 24v dc 3.6A adaptor the cheapest I found was one sold by misco at £60.00 + p&p. A switchable adaptor covering 12 to 24V with a maximum loading of 90W (3.75A at 24V) also from amazon costs £28.99 (trust 90w notebook power adaptor).
If you are unsure about whether or not the unit has a tolerance on the input voltage can you let us know what the unit is (name and model) and we can go from there.
blackprince
As other posters have suggested does the unit that you will plug the 24v power adaptor into have a tolerance on its input voltage. For example can the input voltage range from 19.0v to 24v. I ask this because at the lower end of the example I have given, there is a huge range of laptop power adaptors that you could use which are relatively cheap. If there is little or no tolerance then to purchase an appropriate 24V adaptor is going to be considerably more expensive. I have just purchased a replacement adaptor for my wife's laptop from amazon which has a 19v 3.9A output. It cost £16.16 including p&p.
Looking at a few websites for a dedicated 24v dc 3.6A adaptor the cheapest I found was one sold by misco at £60.00 + p&p. A switchable adaptor covering 12 to 24V with a maximum loading of 90W (3.75A at 24V) also from amazon costs £28.99 (trust 90w notebook power adaptor).
If you are unsure about whether or not the unit has a tolerance on the input voltage can you let us know what the unit is (name and model) and we can go from there.
blackprince
- Thread starter
- #9
its hard cos the adaptor I need is'nt specific...its like rare or something.
badcially its for the Logitech G25 Wheel Controller:
A/C adapter model # DA-42H24
AC INPUT 100-240Vac,50-60Hz
DC OUTPUT 24Vdc @ 1.75A
thats the official AC Adaptor specs....I need that and its hard to find the exact thing which is why I'm confused with the Auto Switching shit!
badcially its for the Logitech G25 Wheel Controller:
A/C adapter model # DA-42H24
AC INPUT 100-240Vac,50-60Hz
DC OUTPUT 24Vdc @ 1.75A
thats the official AC Adaptor specs....I need that and its hard to find the exact thing which is why I'm confused with the Auto Switching shit!
blackprince
New member
- Jul 16, 2007
- 210
I’m sure that you are aware that the Logitech part number you require is A/C 190542-0000 which as you state has an output rated at 24Vdc @1.75A. Unfortunately, the Logitech website is notoriously bad when trying to find spare parts. A common thread running through numerous posts on numerous forums that I read concerning a replacement original power adaptor for the G25 was that the Logitech support desk was either very unhelpful or suggested that the caller purchase a third party alternative.
Just to clear up one of your worries concerning the adaptor’s auto-switching function. Around the world there is not a single standard for the supply voltage, some countries use 230v ac others use 110V ac and so on. The majority of appliances have parts that are designed to work at just one of those voltage levels. There are some however, that can work with more than one level of input voltage which normally is selected by the user by means of some kind of switch. The downside of such a system is the damage that may be caused if the user selects the wrong voltage. In auto-switching units such as the adaptor in question, they have additional circuitry inside that not only allows the appliance to be plugged into mains sockets at differing voltage levels but that circuitry also detects what the voltage level is and automatically switches to it so overcoming the need for human intervention. The fact that the original adaptor is auto switching has no bearing on what replacement you purchase as that does not have to be auto-switching. An adaptor with just our standard 230Vac input is all that is needed for it to work perfectly well.
In my previous post, I suggested some third party alternatives. I have had another search on the internet to see what is available giving an output voltage fixed at 24Vdc and supply at a maximum of 1.75A.
Have a look at this link:
PSU, DESKTOP 24V 2.5A 2-PIN IEC - 521060B-24-3A-1 - IDEAL POWER
Just make sure that the + and – terminals on the output plug matches that of the original adaptor. Just in case you are wondering what I mean by that is that the original adaptor will most likely have a diagram on it that shows which way round the plug is wired. It will have a diagram with a dot in the middle of a half moon with a line coming from each. If the line from the dot on the adaptor has +ve against it then any adaptor that you buy must also have the +ve symbol on the line from the dot. (sorry if I am teaching you to suck eggs on this point)
Just to clear up one of your worries concerning the adaptor’s auto-switching function. Around the world there is not a single standard for the supply voltage, some countries use 230v ac others use 110V ac and so on. The majority of appliances have parts that are designed to work at just one of those voltage levels. There are some however, that can work with more than one level of input voltage which normally is selected by the user by means of some kind of switch. The downside of such a system is the damage that may be caused if the user selects the wrong voltage. In auto-switching units such as the adaptor in question, they have additional circuitry inside that not only allows the appliance to be plugged into mains sockets at differing voltage levels but that circuitry also detects what the voltage level is and automatically switches to it so overcoming the need for human intervention. The fact that the original adaptor is auto switching has no bearing on what replacement you purchase as that does not have to be auto-switching. An adaptor with just our standard 230Vac input is all that is needed for it to work perfectly well.
In my previous post, I suggested some third party alternatives. I have had another search on the internet to see what is available giving an output voltage fixed at 24Vdc and supply at a maximum of 1.75A.
Have a look at this link:
PSU, DESKTOP 24V 2.5A 2-PIN IEC - 521060B-24-3A-1 - IDEAL POWER
Just make sure that the + and – terminals on the output plug matches that of the original adaptor. Just in case you are wondering what I mean by that is that the original adaptor will most likely have a diagram on it that shows which way round the plug is wired. It will have a diagram with a dot in the middle of a half moon with a line coming from each. If the line from the dot on the adaptor has +ve against it then any adaptor that you buy must also have the +ve symbol on the line from the dot. (sorry if I am teaching you to suck eggs on this point)
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