Are all 9V power supplies the same?
– Yes, they are likely interchangeable even though voltage is not the same. This is because the voltage difference is within specs, and I am GUESSING you could go even higher or lower in voltage. Those are some very beefy supplies by the way!
Can I use a 12V power supply on a 9V device?
If you have a 12V adapter, you might wonder whether you can use it to power your 9V guitar pedals. In most cases, you cannot use a 12V adapter to power a 9V guitar pedal. Using a 12V adapter on a pedal designed to only handle 9V can completely destroy it.
Can you power 9V with 5V?
In general, connecting a 9V supply to 5V device could damage it immediately, or in long term, but it is impossible to say without seeing the schematics of the device how much excess voltage it can handle. However, you are using USB devices, so the above does not apply.
What happens if you use a higher voltage power supply?
An AC adapter supplying electricity at a higher voltage than required will cause the connected device to run hotter. Sending power at a higher voltage will also shorten the lifespan of the device and may fry its internal circuits. Using an AC adapter with a different current rating can be an issue.
Can I use 12V 1A for 9V 1A?
NO! Your output voltage is wrong, which is the important part. You can safely use an adapter with the same output voltage, and a current (A/mA) rating equal or higher than the original.
Is 9V too much for an LED?
A 9V battery can’t supply very much current, but without series resistor the current may still be too much for the LEDs. I’m currently working with white LEDs with a typical current of 20mA, which have only 25mA as maximum.
Can I use a 5V 3A charger with a 5V 1a device?
Yes, it is absolutely safe to charge a device with a charger that has more current capacity than needed. Since the voltage is held constant (5V), the only factor that determines current draw is the load (another term for resistance) the device places on the charger.
How long will LED last on 9V battery?
A typical alkaline 9 V battery is about 500 mAh capacity, so at 5 A that would come out to be about 0.1 hours (assuming that it could actually achieve that capacity at that heavy a current draw, which it couldn’t).