PS problem (pics and schem inside)

[Zero the hero]

I've built another PS for the Maestro Ring Modulator, and this one should replace the old one on GGG.
I got a problem with it: I used standard 7815 and 7915 to obtain regulated bipolar supply. When I measure the tensions of the positive side of the supply I read +15.12 V. When I measure the negative side of the PS I read -25 V.
I had the same problem with another schem and layout of the one I posted.
I measure everything with no load on the PS (i.e. the main board of the ring mod is not connected to the supply).
Here are the pics:
http://photobucket.com/albums/v368/zero_thehero/electronics/
I double checked everything, since I've built this circuit twice with different regulators...
I'm stuck!!!

[spongebob]

I measure everything with no load on the PS (i.e. the main board of the ring mod is not connected to the supply).

Some regulators need a certain load to function correctly, try connecting a load resistor (1k?) from each rail to ground and measure again.

Other than that, I can't see any errors with the ps schematic, layout looks fine too.

[mikeb]

I can't see any errors either, the circuit is almost exactly the same as the bipolar supply I use for the infinitphase. I checked the layout and the pinouts of the voltage regulators - no problems there. Hmmmm.

Mike

[Zero the hero]

Thanks for the replies!
I haven't connected the main board cause I was afraid to burn something on it, and you know how rare is an MC1495...
I'll try to put a couple of 10k loads on each side of the PS.
Another idea I got just now is to read both side of the PS at the same time, with two different DMMs...
I'll keep you informed.

[niftydog]

measure the input voltages to the regulators as well. This will give you an idea if they are working or not.

[Zero the hero]

Thanks a lot people!
Now everything's working fine. I tried to put a couple of 33kohm resistors as a dummy load, but with the same result.
I changed the load resistors to 1.5k and now I got +-15 v regulated.
It's time to finish another ring mod!