Hi, im making MP3 player, with some buttons, potentiometer and a speaker.
I dont want to use batteries for it, I think it could be to expensive over time.
So Im using a 9v 1 Amp DC adapter, and the case is made with a MDF 5mm with a Laser Cut especially for this project.
Could this be a problem if some part heat to much and a start a fire?
acidburn86:
Could this be a problem if some part heat to much and a start a fire?
Yes.
If you have parts that get too hot, you already have problems with your project. Fix that before you put anything into a box.
Paul
And ... ventilate the box .
A thin wire carrying 1 Amp can cause a fire.
It is your responsibility to have components run at cool temperatures.
Assuming this is an Arduino project... why 9V?
Take a piece of scrap and see how easy it is (or is not) to ignite.
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Paul_KD7HB:
If you have parts that get too hot, you already have problems with your project. Fix that before you put anything into a box.Paul
Well the project is like this:
I dont know too much about electronic, so I think a 9v 1amp adapter coul be less risky than a 12v that maybe heat much more than a 9v.
Do you think that any of these parts could heat in normal situations?
larryd:
A thin wire carrying 1 Amp can cause a fire.It is your responsibility to have components run at cool temperatures.
Hey thanks for your response. After the 9v from the adapter enter to the arduino uno, I use the 5v pin.
what wire do you recomend for this kind of project?
Suggest you use 24AWG stranded wire (7 or 9 tinned copper strands).
26AWG could be used, 28 is too small.
Avoid wire that ‘does not’ have individual tinned copper strands.
Avoid
Critical details missing.
Are you proposing to put the 9 V adapter in the MDF box? If so, why?
Why would you use a 9 V adapter? The Arduino runs on 5 V, not 9. A UNO has a fairly useless regulator on-board and the references misleadingly suggest it is usable to power it from 9 V. In fact, it is far better to use a common USB "phone charger" providing the necessary regulated 5 V and if your current draw is less than 400 mA, then it just plugs into the USB connector.
The "phone charger" does not need to be in the MDF box - it just plugs into the power socket.
Cute, but he has extra wiring. 
Oh, well then, in that case . . .
Thought there was an Arduino wiring problem that caused that 
I think more significant is the awful idea of putting a prototyping breadboard into a case as a finished project. BIG nono.
Paul__B:
Critical details missing.Are you proposing to put the 9 V adapter in the MDF box? If so, why?
Why would you use a 9 V adapter? The Arduino runs on 5 V, not 9. A UNO has a fairly useless regulator on-board and the references misleadingly suggest it is usable to power it from 9 V. In fact, it is far better to use a common USB "phone charger" providing the necessary regulated 5 V and if your current draw is less than 400 mA, then it just plugs into the USB connector.
The "phone charger" does not need to be in the MDF box - it just plugs into the power socket.
No, the adapter is 9v 1 amp external, like this:
Should I use a regular phone charger with 5v 500mah?
The Arduino runs at 5V, any more than that just gets wasted as heat.
acidburn86:
Should I use a regular phone charger with 5v 500mah?
If your circuit will not require more than 500 mA (not mAh! ) that would be just fine.
