GGG Bipolar power supply problem?

[w!ll]

Hi, fairly new to this diy effects business. I've been attempting the GGG bipolar power supply with a 7815 and 7915 for +/-15v for a ring mod. It's my first attempt at a bipolar power supply. I'm using an 18v ac-ac wallwart and the PCB layout provided in the GGG project file http://www.generalguitargadgets.com/pdf/ggg_bipolar_ps.pdf. The problem is that the readings i'm getting on the + and - outputs are extremely low. I'm barely getting 0.1v on each rail. Can anyone help?

Will.

[anchovie]

Look up the datasheets for the specific manufacturer of your regulators - there isn't an industry standard for the pinouts.

If all is good with the connections, measure the voltage at the regulator inputs to see what is coming from the rectifiers.

[w!ll]

Hmm, regulators where going to the right points. I've measured the voltage at the regulator inputs and the rectifiers and i'm getting similar readings to my initial ones. I must have done something wrong? The jack for the wall supply looks wired correctly. I've no idea what the deal is..

[anchovie]

Can you measure the AC output of the wall-wart? First on its own and then connected to the board.

[w!ll]

There's something amiss here. either i'm doing something wrong or something is not working. DMM is set to 20 AC voltage. Negative probe to the ground lug on the PS input jack and postive probe to the positive terminal gets about 1.4v. That can't be right surely?

[w!ll]

Just tried one of my DC adapters in to the same socket and i'm getting 9.4v. Are there any issues using AC output wall warts with DC jacks? I didn't think there was. If the AC wall wart is faulty i'm gonna be annoyed, I haven't even used it until now! are there any tests i can do to check if it's faulty?

Will

[anchovie]

I wouldn't have thought a jack socket would care if you put DC or AC into it - they're just known as jacks rather than DC jacks! As a sanity check, stick one of your meter probes into the centre of the AC wall-wart's plug and touch the outer barrel of the plug with the other.

[composition4]

Are you sure it's an AC output wall wart and not DC (despite what it may say)?  Try measuring DC output directly from the wall wart.  Just a thought, could explain the reading

Jonathan

[w!ll]

Yeah i tried testing the power supply as you said already, AC and DC, still nothing. I guess i couldn't really believe i was unlucky enough to get a faulty one first time. I can exchange it for a working one at no extra cost i think, so no problem there. Thanks to everyone for there help 

Will.