5k views

Limiting current from a 5v power supply [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I have a 5V / 1A regulated supply. I'm thinking of using it to power a PCB which asks for 5V and 0.25A. In ...
1k views

Using DC current to operate a fish feeder that takes 2 AA batteries [duplicate]

I'm a complete electronics newbie. I have a auto fish feeder that takes 2 AA (1.5V) batteries. After changing the batteries quite often I got curious to find out if the feeder can be modified to run ...
87k views

Is it okay to use a power supply that provides slightly more voltage and amperage than what's rated? [duplicate]

To preface; I am aware that there are a lot of questions that are similar to mine. But I am finding mixed signals as well as jargon I don't understand; and I was really just hoping somebody could ...
80k views

acceptable bounds for replacement DC adapter [duplicate]

Possible Duplicate: Chosing power supply, how to get the voltage and current ratings? I've got a broken gadget that is discontinued. The only thing broken is the power supply (verified by my ...
7k views

Increasing voltage, but same current [duplicate]

There are a lot of questions asking what happens if you change the current, but keeping the same voltage. If more current is flowing to me it means you can damage the device. But what if it is the ...
4k views

Why using a power adaptor with mismatched current rating will not damage an electronic device? [duplicate]

Plugging in a power adaptor with mismatched voltage will damage an electronic device. However, plugging in a power adaptor with mismatched current rating will not. Why is this do?
42k views

Can I replace the power adapter of 12V/0.8A with one of 12V/2A? [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? Can I replace the power adapter of 12V/0.8A with one of 12V/2A? I have a Digital device that uses a power ...
1k views

C or D batteries instead of AA [duplicate]

a few days ago I had a asked a question regarding longer lasting batteries for a walking robot built with a Tamiya gearbox. Since the AA batteries were being depleted too fast, it was suggested that I ...
5k views

Split 5V 3A into 1A in 2A to make USB charging device [duplicate]

Overall goal: make a couple USB phone & tablet charging ports from a 12V deep cycle battery. Steps taken so far: I've read that using a resistor based system to step down from 12V to 5V leads to ...
14k views

Can a more powerful charger burn something? [duplicate]

I am told that I must use 5V, 1A charger to charge power bank. If I will use 5V, 2A charger then will it burn power bank? Is that possible? $I = V / R$ Charger give constant voltage and current ...
22k views

can I use a 5v 1a charger with a 5v 2a device? [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I have a new tablet with a charger that reads 5v 2a, can I charge the tablet with my phone charger, which ...
37k views

How do I wire a 12V DC fan to 120V AC source? [duplicate]

I am trying to install this miniature computer fan in a heated incubator that operates at 50 Celsuis 24/7 in order to encourage air flow throughout the box. Small fans like this run on 12 DCV power, ...
1k views

Given a known power supply, what are safe ranges for the volts/amps/ohms of connected components? [duplicate]

I'm new to hardware and am coming from a software background. I have an SoC that will be powered by a supply generating 5V and 1A. I'm trying to figure out what are the safe ranges of volts/amps/ohms ...