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Delphawi

USB Power

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Hello

I need to connect some (or all) of three components I have to a Laptop USB port to use it as a power for the circuit . The power specifications for them are the following :
First one DC12V , 0.18A
Second one DC05V , 0.17A
Third one DC12V , 0.14A

How can I use the USB power to make my circuit work ? how many components I can run using a single USB cable ?

Thanks in advance

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If your lapto doesn't have dedicated charger port, you cannot get more than 100mA without negotiation for more, for example microcontroller to tell host to give more power. Even with proper negotiation, 500mA is max. from normal USB port. And USB gives only 5V, so you'll need some step-up power supply from 5V -> 12V.

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