9V from 3V3/7V from 5V regulators

As the subject says,

With only my RTC connected to the 5 volt regulator, and the 3.3 volt regulator open-ended, I'm getting 9.38 volts on the 3.3V regulator output, and 7.83V on the 5 volt regulator, with a 10.1V input off a 9VDC wall wart.

I have a .1uF capacitor across the input lines, a 22uF across the output and ground of the 5V regulator, and a 10uF across the output and ground of the 3.3V regulator.

Did I do somethign wrong, or do I need significant loads on the regulators? (The RTC only uses the 5V pole during I2C communication)

5 volt is a L4941BV 3.3V is a LD33CV

http://www.mouser.com/Search/ProductDetail.aspx?R=L4941BVvirtualkey51120000virtualkey511-L4941BV

http://www.mouser.com/Search/ProductDetail.aspx?R=LD1117V33Cvirtualkey51120000virtualkey511-LD1117V33C

This is what you would expect if the regulators are wired the wrong way round or the ground is not connected. It was the ground last time this cropped up. Something to do with a faulty solder less bread board.

Grumpy_Mike: This is what you would expect if the regulators are wired the wrong way round or the ground is not connected. It was the ground last time this cropped up. Something to do with a faulty solder less bread board.

I get dumba** of the week award this week.

I had the grounds soldered together...just not to the ground of the power source!

It shouldn't have harmed the regulators though, right?

It shouldn't have harmed the regulators though, right?

Right no harm. :)