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need help with using one power supply to power multi guitar pedal?

Hello .
i have two DIY guitar pedal , they work normal in a chain and each of them use they own power supply( 9v AC-DC adapter).Now i want to use one power supply to power both of them.So , i wire them like the picture bellow, and i get the 60hz noise.
Can you please tell me how to get rid of that noise.
Thanks in advance !
sorry for my bad English.

http://i247.photobucket.com/albums/gg132/chipmapple/noisepw.png

Picture of need help with using one power supply to power multi guitar pedal?
Try disconnecting the ground line between the two boards.
iceng5 years ago
Or the two PCBs together overload the small adapter causing supply ripple.

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