1960s Magazine On How To Build A UFO Detector

by Daniel Russ on May 24, 2011

UFO Detector

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{ 3 comments… read them below or add one }

Harvey May 25, 2011 at 3:16 pm

Here is a link to the Mullard info site. THe transistors are Mullard OC 71 and OC72 Germanium transistors. The schematic depicts they are PNP type.

http://www.wylie.org.uk/technology/semics/Mullard/Mullard.htm

Daniel Russ May 27, 2011 at 10:00 pm

Thanks bro

nick April 5, 2014 at 10:24 am

TR4 has e/c swapped. this is a known error on this circuit. have you built it yet?

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