Who has not experienced the beneficial effects of the measuring noise of the rain forests, the sea… the sound relaxes and soothes. That is why the simulator of the surf, which we offer to readers, is used as a stimulant of sleep in insomnia. Generator “of the sea” is easy to manufacture and configure, does not contain scarce radio parts and accessible even for novice radio Amateurs. Here’s how it works.
As a source of “white” noise is used sverhekonomichny cascade transistor V1 (Fig. 1). With it through low pass filter R5, C10 signal “white” noise is supplied to the amplifier stage V2. The power transistor V2 is supplied from the capacitor C12, which is periodically charged via the electronic key, assembled on the transistor V3. The electronic key controls the multivibrator V4, V5. And since the voltage at the transistor V2 varies periodically, the modulation of the white noise amplitude. The result is a sound resembling the noise of the surf.