Atmospheric disturbances, air disturbances, typhoons, and in-fact atomic bomb
explosions produce not only massive air movements but also magnetic oscillations. These magnetic oscillations can be detected from long distances with the help
of a sensitive amplifier and a special antenna.Some people dubbed this circuit as "storm detector".
The detector circuit is actually very simple. The most important part is the antenna (shown in the diagram as L1). It is made of 220 turns magnetic wire wound side by
side around a square wooden frame. The square frame's dimension is 85cm by 85 cm.
One 0.022 µF capacitor (labeled as C4 in the diagram) must be soldered in parallel to the ends of the coil winding. This coil/capacitor combination produces
a resonance of around 4 to 5 kHz. The output of the detector can be connected to either an oscilloscope or a clocked oscillograph. This circuit is most often used as a typhoon detector.
Parts Placement Layout
External Wiring Layout
Electronic Circuits volume 1.0 - Circuit Nr. 23
The complete data of the electronic circuit described above can be found in the following book and is available from Amazon.com.
Click on the image to view the book.