i am monster
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is a "wall wart" just like a thing that plugs into the wall that converts ac to dc like a video game system uses or a batterey charger that you can then plug into a bread board and use instead of battery cells
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is a "wall wart" just like a thing that plugs into the wall that converts ac to dc like a video game system uses or a batterey charger that you can then plug into a bread board and use instead of battery cells
Well the higher the amps on the wall wart the more you'll be able to power with it, but I think it's unlikely you'll need a 3A supply. Depends what exactly you're powering.
Just to clear up some confusion: Assume that your load (breadboard or whatever) is rated at 12V, 500mA. You could run this load with a power-supply rated at 12V 100A, or a car battery (which is about 12.6V) but capable of delivering 1200A (Cold Cranking Current rating) and your load would still only DRAW a maximum of 500mA!!!!
Think of it this way: 12V is the CAUSE, 500mA is the EFFECT. The load knows nothing about how much current the supply can DELIVER, it only draws what it needs off the supply. The supplies' job is to keep the voltage constant at 12V, and for that to happen, it needs to deliver a minimum of 500mA.
Nobody cares if the supply is capable of delivering more than 500mA, unless you accidentally create a short circuit or miswire your circuit. That is why supplies used for lab work usually have built-in current limiting, so that you can set the current limiter a bit higher than your circuit under test will draw, thereby limiting the amount of smoke in case you screw up!
Just to clear up some confusion: Assume that your load (breadboard or whatever) is rated at 12V, 500mA. You could run this load with a power-supply rated at 12V 100A, or a car battery (which is about 12.6V) but capable of delivering 1200A (Cold Cranking Current rating) and your load would still only DRAW a maximum of 500mA!!!!
Think of it this way: 12V is the CAUSE, 500mA is the EFFECT. The load knows nothing about how much current the supply can DELIVER, it only draws what it needs off the supply. The supplies' job is to keep the voltage constant at 12V, and for that to happen, it needs to deliver a minimum of 500mA.
Nobody cares if the supply is capable of delivering more than 500mA, unless you accidentally create a short circuit or miswire your circuit. That is why supplies used for lab work usually have built-in current limiting, so that you can set the current limiter a bit higher than your circuit under test will draw, thereby limiting the amount of smoke in case you screw up!
I think the voltage will be 10V to 12V.Say a basic 9VDC unregulated supply rated at 1A was used to power a circuit requiring 9VDC but only 30mA. The voltage would then be well over 9VDC.
I think the voltage will be 10V to 12V.
If the wall-wart was small with a rated current of only 100mA then its voltage without a load or with a low load will be 18V or more.
A high current transformer is strong with low resistance windings which allows it to have pretty good voltage regulation.
A low current transformer is just a very thin wire with lots of resistance so has poor voltage regulation.