A diagram showing usage of the acronym TX instead of transformer.
Circuit diagram extracted (with modifications) from: Raymond J. Fairbend, Richard T. Holmshaw, Colin H. Petley, Power supply for an intensified night sight, 1986, Patent US4629881: http://www.google.com/patents/US4629881
tx_patent.png
tx_patent.png
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United States Patent and Trademark Office, Public Domain
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