Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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EG&G SPCM-AQR-13-FC Single Photon Counting Module on eBay (no relation to seller)

I HAVE NO RELATION TO SELLER – Just passing along in case someone is interested. eBay item number 271206242864: “The EG&G (or Perkin Elmer) SPCM-AQR is a self-contained module which detects single photons of light over the wavelength range from 400 nm to 1060 nm and sensitivity which often outperforms PMTs. The option 13-FC indicates

 
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Original Source for Flyback Driver Hack?

One of my all-time favorite circuits is the the following DC-to-AC inverter (click diagram to enlarge) based on an old color TV flyback:

 
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