I had such a great start with the book that I think all the gremlins are now starting to appear... I've got the circuit for Exercise 21 wired up but I'm not getting any voltage on the breadboard. I've taken multimeter readings of my AC adapter... 9 volts there. I've checked all my wiring... so now I'm beginning to wonder if I may have damaged the 5V regulator somehow? Anyone know how sensitive or rugged these little devices are? I've only got one, so I have no way of testing it.

I replaced the two capacitors as well... but no luck. I took a voltage reading across the larger capacitor (.33 in the book but I substituted a 2.2)... it barely reads 1V.

Any ideas? I really can't move forward either since a few of the remaining exercises rely on the 5V regulated voltage setup.