We practically continually faced with a variety of fine bubbles, whether drugs, herbs, solvents, perfumes, mascara or nail Polish. And they have one common drawback: volatility. One careless movement — lo and behold, the fold is overturned. However, the bubble will never fall,- if to use here such device. Take a circle from a rubber, soft plastic or cardboard, make a middle crosswise cut and put on the bottle: higher stability is guaranteed.
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ACOUSTIC PROBE
The magazine "Amaterske Radio" (Czechoslovakia) proposed scheme is a simple audio probe to detect logic levels; low (logic 0) and high (logical 1). The device consists of a bitonal...
RUN… FROM THE WALL OUTLET
Every driver knows how it is sometimes difficult to start the engine of a car on a winter morning after long Parking. However, a relatively simple device powered from an AC mains voltage...
