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Got mine off amazon.jp. Japan's Amazon. I had trouble finding them too. Funny thing is now I have 9 extra laying around. Wasn't a bad price. Maybe check it out if it's worth the shipping.

9v straight to an LED will burn it out. Depending on the specs out can drop the resistance a bit, but there is a limit before it is destroyed

Finally finished mine after sourcing all the parts here in Japan. Cd4046 was the hardest to find from the chips. Still have the wrong switch for the dpdt, but it works in two modes for now. Only setback I had was the Tl072 wasn't connected enough. It was working one minute but not the next...

I just finished the mini heterodyne with those tayda rotaries. Fits perfectly, just a tad tall on the shaft. I'll cut them down.