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5V power from microhone jack

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prabhjassal

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First of all, I am complete newbie in electronics. Just started tinkering around with it about two months back and started soldering stuff around 1 month back.

So, I have searched endlessly on this. I have a pcmcia usb card in my laptop which needs external 5V supply which was provided generally by USB. Since, I have only 2 usb ports available on my laptop, i decided to go another way. Now, the microphone jack gives out 5V out. Can i use it to connect to give the power to card instead of USB. Also, which part would be used as a ground.

I have already made a VGA->USB power only but I don't know why it didn't work, so this might be last hope for me. Thanks for any help you can get me.
 
I dont think that the Mic jack 5V will deliver enough current to power your PCMCIA card.

I have bought regulated AC-powered cell phone chargers than produce 5Vdc (well-regulated) rated to deliver up to 350mA for $1 (at a surplus store). Get one of those.
 
Not a chance, the mike socket doesn't provide 5V power, it simply provides a low current via a resistor to bias an electret mike - you can't use it to power anything.
 
well actually that's the thing, the card already came with a usb cable and an adapter to power the card but i don't want to use anything external. it can power with both a usb port or an ac adapter.
but i have seen somebody use a vga->usb converter to do this kind of thing. as the power supply in a laptop would be supplying all electronics almost same current, so could even in theory it could work or the microphone jack supplies low current compared to usb
 
Not a chance, the mike socket doesn't provide 5V power, it simply provides a low current via a resistor to bias an electret mike - you can't use it to power anything.

thanks for the reply. I guess I have to go back to work on vga->usb method if it's supposed to work as it does with everybody else
 
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