Don,
A quick look shows that your schematic calls for a LM324 but your
breadboard is showing a LM339 wired as a LM324. Nice try. Not the same
pinout on the chips.
If you use a 339 you need to look up the pinout and make changes to
your wiring diagram accordingly.
Try National Semiconductors Website.
Clark Hinds
Cetacea Sound, Inc.