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.
Pressing and releasing S1 remains one of the neon lamps. Which one will be, it is not possible to...
This circuit, which appears on our website in different versions, uses an integrated VU which is...
This VCA was found in the July 1988 issue of Radio Electronics magazine. It uses an OTA op amp and...