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The rule with power adapters is generally that the voltage must be the same as the device's input voltage requirements. However, the amperage just has to be equal to or greater than the device's input current requirements. The device will draw as much current as it needs. But, mismatching voltages can destroy electronic equipment.

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Q: Can you use a power adapter that has less amp input?
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Can you use a 9v 300ma ac adapter in 9v 100ma socket its for a micro guitar amp?

yes but the device will not work property or nor work at all <<>> No, the 100 mA adapter will be too small to operate a device that requires 300 mA for its operation. By trying to draw a higher current than the adapter can supply, the adapter will heat up and possibly burn itself open. In other words the adapter will stop working.


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Providing that you maintain the same voltage and above all, make sure that the polarities are the same, yes, it should work. It's OK to have a little more power available than the device requires but it shouldn't be less, which can cause the cable to over heat or cause undue stress on the device itself. It sounds as though you're using a wall adapter to run something, and the extra .5 amp capacity should be OK. But, when using a wall adapter, always try to keep as close to the rating of the device as possible. Wall adapters that provide more power than what's needed, can over heat because the extra power isn't being used. It's just being converted to heat. Since you're within 20 percent of the device's ratings, this shouldn't be a problem.


How does an op-amp differ from other amplifier suchas common emitter transistor amplifier?

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Related questions

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Can a 12 volt 0.5 amp ac adapter substituted with a 7.5 volt 1 amp adapter?

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