![]() SPKR: Any 8 ohm, 12 ohm, or 16 ohm Speaker greater than 3 inches diameter. Optional 200 ohm volume control resistor. VR1 (part not labled in diagram near speaker). Lower resistor values cut higher frequencies and general sensitivity. Adjust value higher or lower for best overall "tone". Q1, Q2, Q3, Q4, Q5: STORMWISE PART # 2N4124 NPN Transistors. The unit can be tuned by placing a capacitor across the antenna leads, but this will distort the pleasing sounds of the natural radio waves. The unit allows wide band (untuned) reception and features Hi-Lo tone control switch (SW1). This 5 transistor VLF receiver will drive a speaker. Listen to Whistlers, Tweeks, Auroras, Earthquakes, and other natural events that create VLF radio waves in the range of 100 Hertz - 10000 Hertz. This circuit is shown as an educational example only. There is no technical help with the projects. The following information is for educational and experimental uses only. ![]() (903) 383-7047 Build an VLF Whistler Receiver Home ![]()
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