The laptop, although it is a laptop, but for the most part he is powered from the mains through an...
The meter is designed to measure the temperature of the air, as if to protect sensor, and any other medium...
The signal from the microphone WM, amplified by the transistor VT1, through the resistor R4 is applied to the varicap...
The use of ultrasound is another direction in the development of "Proximity Detectors". In Fig.1 shows such a device. In...

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