This makes it useful for tape recording weak signals.Ī small VLF antenna can be made that works with this unit. The receiver features an audio amplifier with low internal noise. The receiver accepts tuned antennas and broadband antennas.
You can hear tweeks, whistlers, world wide lightning static, auroras, earthquake noise, and other natural electromagnetic phenomena. Just a handful of parts allows you to listen to Earth's electromagnetic waves in the frequency range of 300 Hertz to 20000 Hertz. The Earth produces strange electromagnetic waves. This circuit is shown as an educational example only. There is no technical help with the projects. 90 Stormwise VLF Radio Electronic Project Book © 2008
