Hi guys,
I am very new to circuits and have needed to build one for my research. My professor made a schematic and then I made it and had some boards printed off. I put all the components on but when I tested it, I did not get the voltage drop across the power and ground that I should have. I am using a CP-102A-ND power jack (http://www.digikey.com/product-detail/en/PJ-102A/CP-102A-ND/275425) and when it is out of the circuit I get a voltage drop of 12.2 volts. When I solder it to the circuit, I get a floating voltage of about 1 volt. I looked for a voltage drop on every pin in the circuit and can't find anything. The power goes to a DC-DC converter (http://www.digikey.com/product-detail/en/ASA00BB18-L/454-1446-ND/2203670) and the ground is connected to a common ground for the board. One thing that I have noticed, is that if I place the wall wart jack about half way in (so that power is connected but ground is not), I can see a voltage drop from the pin on the board for power and the ground of the wall wart jack. I not really sure what this means or where to get started on trouble shooting this. If anyone has any Ideas, I would really appreciate the help.
Thanks,
Stephen
I am very new to circuits and have needed to build one for my research. My professor made a schematic and then I made it and had some boards printed off. I put all the components on but when I tested it, I did not get the voltage drop across the power and ground that I should have. I am using a CP-102A-ND power jack (http://www.digikey.com/product-detail/en/PJ-102A/CP-102A-ND/275425) and when it is out of the circuit I get a voltage drop of 12.2 volts. When I solder it to the circuit, I get a floating voltage of about 1 volt. I looked for a voltage drop on every pin in the circuit and can't find anything. The power goes to a DC-DC converter (http://www.digikey.com/product-detail/en/ASA00BB18-L/454-1446-ND/2203670) and the ground is connected to a common ground for the board. One thing that I have noticed, is that if I place the wall wart jack about half way in (so that power is connected but ground is not), I can see a voltage drop from the pin on the board for power and the ground of the wall wart jack. I not really sure what this means or where to get started on trouble shooting this. If anyone has any Ideas, I would really appreciate the help.
Thanks,
Stephen