If you can’t make it to Chuck to turn the light bulb and no ladder or chair will help you simple device from a dense paper and two rubber bands.
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ELECTROSTIMULATOR ON A COMPUTER
Devices for influencing the so-called biologically active points (BAP) are known to many. Including those created by radio Amateurs. Circuitry underlying some BAT-stimulants, saw light...
SOUND AND LIGHT TEAM
Automatic devices that produce sound and light signals, are widely used in various designs and models. Usually auto-switch performs the multivibrator, the control of sound or light...
