Simple beam break sensor

[mackrackit]

Mold...Mold on the bread board.

You may be picking up some stray capacitance someplace.

[The Master]

I think its just got a few bad connections on it.

The circuit still isnt working. Ive had a look at the output on my picoscope and its not a 50% duty cycle. I dont really know how to read the results properly but im pretty sure its the wrong frequency too.

Im gonna go sleep on it. My head hurt a little after reading that link you posted. I think ill go back to the metranome and mess with some values tomorrow.