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Problem with ground of a board

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gmittal

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Hi All,

In the board I designed , I am using Power jack connector (similar to the one we have on laptop). Input to the board is 12 V. I have voltage regulators to generate other voltages like 3.3, 2.5 etc on board from 12 V input.
The problem is when I connect the voltage adapter to the board , it is not generating the correct voltages however if I also connect it to an external ground everything works fine. So I think The board is not getting ground
attached is the snapshot of the power jack connector connection,
Any help will be really appreciated.

Thanks
 

Re: Problem with ground

Hi gmittal,

Quick question why do you have a bridge rectifier in the circuit, I take it that your power input is 12V DC. If so remove the rectifier and connect the ground pins of your jack to your circuit ground and everything should work fine.
 

Problem with ground

What is the off load voltage of the adapter output?

What is the on load voltage of the adapter when plugged in?

AC or DC?

If DC try shorting from jack pins 2 & 3 to the bridge -v terminal. You will still have reverse polarity protection ( although not needed unless the adapter lead can be swapped around).
 

Re: Problem with ground

I am using 12Volt 4Amp Battery Charger to provide power to my board , Is this a problem?

Is there any difference between 12V switching power supply and 12 V battery charger

thanks
Gaurav
 

Re: Problem with ground

Your symbol for the input power is an audio connector, check your pin-out. A battery charger is an extremely poor choice for an electronic supply, if you scope the output you'll see nothing but noise, there is no filtering at all, you would need a substantial filtering circuit to make it usable.

SiGiNT
 

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