Suggested by a 90s Popular Electronics this circuit is intended to receive volleys or whistles from thunderstorms in the wave range below 20 kHz. The coil consists of 300 turns of wire 26 in a ferrite rod.
Originally designed to analyze the shape of light pulses from a flash for photographic...
This CMOS oscillator circuit generates signals up to a few megahertz, depending on the capacitor value....
Generating sinusoidal signals from 1.5 to 15 kHz, this oscillator uses common complementary...