Liquid Nitrogen Generator - Overview

This liquid nitrogen generator uses a Stirling-cycle cryocooler that was pulled from a cellular phone tower. It was used to cool a superconducting RF filter that aids cell communications. The cryocooler is able to pump enough heat away from its cold end that air will liquify and drip into a vacuum flask for storage.

Jeri's video at Maker Faire 2010:

Blog post with more construction details:
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