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.
July 2017 - The Texas Instruments step-down converter module of the same name IC can now be...
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...
Found in American documentation from the 90s, this circuit can measure frequencies on a linear...