Now, many medicinal tablets are Packed in colorful plastic cells, covered with foil or paper. In improvised signal light devices are very convenient to use such cells as the cap-filter for signal lamps.
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THE TIMER CONTROLS THE SOUND
The device, whose scheme is published in the journal "Popular electronics" (USA), produces a positive pulse when a sound (for example, firing of the gun) reaches the microphone B1 (see...
Protective sensor
Motion sensor DD-010 disassembled with the control board removed and an additional siren (100 dB sound level) type KPS-4510 connected. Motion sensors (DD) based on Fresnel lenses and...
