Some of the circuits we tried needed 2 diodes in the green cathode wire back to the 556 for it to turn off completely. I think Rod put provisions on the PCB for two diodes just in case. He only needed one diode most of the time, I think he only had the green problem a time or two. I had the problem almost all of the time here and needed the 2 diodes. We also have different 556s, as Stan noted above, if that could cause a difference? Rod has the ones you can stare at to trigger, I have the others.
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