Power Supply 2A vs 3A / DVR

8
Found 15th Nov 2017
I have a DVR with a faulty mains power supply that needs changing. Is a 12V 2A power supply the same as a 12V 3A power supply? Can in use 3A in place of 2A? Would it over supply/burn out the DVR? Thanks.
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Depends how good the dvr is, if its resistors etc can handle ot then 3 amp wont be an issue
Shouldn't matter as long as your 12v is regulated and the polarity is the same. 3A just means how fast can current flow before the you have a voltage drop. It means that you can draw more power before you get a voltage drop so it's a better to be higher than lower.

Remember to check to see if the DVR is double insulated or grounded and what the connectors are the same. -12V might kill it dead if it's looking for +12V
master1022 m ago

Depends how good the dvr is, if its resistors etc can handle ot then 3 amp …Depends how good the dvr is, if its resistors etc can handle ot then 3 amp wont be an issue



You are confusing current and voltage, in simple terms voltage is pushed current is pulled, so it’ll only take what it needs provided the voltage is constant.

It’ll probably be a barrel jack which in most cases pin on the device is the positive
I would use it, just make sure there like for like ie both DC or AC.
Dannyrobbo1 h, 33 m ago

You are confusing current and voltage, in simple terms voltage is pushed …You are confusing current and voltage, in simple terms voltage is pushed current is pulled, so it’ll only take what it needs provided the voltage is constant.It’ll probably be a barrel jack which in most cases pin on the device is the positive



Unless for some reason the DVR malfunctions and it pulls more current than its rated for? If any internal components blow as a result, good luck repairing it.
master1033 m ago

Unless for some reason the DVR malfunctions and it pulls more current than …Unless for some reason the DVR malfunctions and it pulls more current than its rated for? If any internal components blow as a result, good luck repairing it.



if the circuit malfunctions in such way you’d be throwing it away regardless. It’ll work no issue and if the same failure happened on 2A or 3A it would still be in the bi
Dannyrobbo19 m ago

if the circuit malfunctions in such way you’d be throwing it away r …if the circuit malfunctions in such way you’d be throwing it away regardless. It’ll work no issue and if the same failure happened on 2A or 3A it would still be in the bi


I get your point but not necessarily, because a 2amp supply wont provide more than the DVR is rated for, a 3 amp will. Id rather blow a power supply than the DVR.
As Dannyrobbo says - the DVR will only take what it needs. It needs 2A - if you have a correct voltage power supply rated at a minumim of 2A then it will be fine.

So yes - a 3A power suppy will be fine (your DVR will use just 2A.
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