Comments on: DIY liquid nitrogen generator http://blog.makezine.com/2010/06/07/diy-liquid-nitrogen-generator/ DIY projects, how-tos, and inspiration from geeks, makers, and hackers Tue, 21 May 2013 15:50:32 +0000 hourly 1 http://wordpress.com/ By: Douglas Gourlay http://blog.makezine.com/2010/06/07/diy-liquid-nitrogen-generator/#comment-266097 Wed, 17 Aug 2011 16:31:00 +0000 http://makezineblog.wordpress.com/2010/06/07/diy-liquid-nitrogen-generator/#comment-266097 Hi Ben,
Great projects with incredible detail in your documentation of the process and theory behind their function.  I built a Transmission EM in highschool for a science fair project.  The glassware was done by a very generous university glass blower! 

I’ve looked on ebay for cryocoolers and as usual, the deals are few and far between.  There is a 7W refurbused Ricor for $1800 Or Best Offer! (new price is $12,000) There is also a unit from Israel that is listed as working but not getting cold.  Can you offer any insight into trouble shooting a broken cryocooler?  Easy to repair (helium recharge? or failed compressor?) or difficult?

Thanks
Doug
(BTW, I did my grad studies in dielectric chemistry but eventually went into anesthesia as a medical doctor.  I remember the Liq N2 plant with foundness.  More than a few “wine-scicles” were produced back in my masters year – much less during PhD studies :)

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