Welding Effect
The effect couldn't be any simpler and easier: one cool white flickering LED, one resistor, and one pushbutton.
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The effect is currently in use on the Where She Sleeps diorama.
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Periodic Welding Effect
You may not want to fuss with a pushbutton to make the effect sporadic. In this case, a simple crossing flasher circuit, available on eBay, will do the job.
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The periodic welding effect is currently in use on the Men At Work diorama, in the gas station.