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I'm currently working on building a large spider prop (Charlotte) from paper mache and I want to give her flashing red eyes for that "extra something special." Any suggestions on how to achieve this effect, preferably without the risky business of putting holes in her?
 

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If you can do a bit of soldering (or not) you can use one flashing LED and one non-flashing LED wired in series with the appropriate resistor. Both LEDs will flash at the same rate. The only thing is that you don't get to adjust the flash rate - it's whatever the flashing LED wants to do. If soldering is out of the question, you should be able to assemble the LEDs with some good electrical tape.
 
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