Humidity indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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Indicator scheme:
(click to enlarge)
In total, business is that one microcircuit. When the SE1 sensor gets wet, the buzzer starts beeping and the LED lights up. To turn off the alarm, dry the sensor and press the S1 button.
The circuit uses a buzzer with a built-in generator. The design of the sensor can be any, for example, you can etch such a pattern on a piece of foil fiberglass.
The microcircuit has a foreign analogue - this is CD4093.
Publication: radiokot.ru
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The design of the microphone includes a "double condenser capsule" that allows you to choose between three pickup patterns: cardioid, stereo and night, optimized for whispering. In fact, the case contains two capsules with a diameter of 14 mm.
The frequency response of the microphone is 20-20 Hz, the maximum sound pressure level for which it is designed is 000 dB. The microphone supports sampling rates up to 110 kHz and 48-bit data representation. The package includes a stand, or base station with controls for selecting the directivity pattern and changing the signal level, with a 24 mm jack for connecting headphones for real-time monitoring. The dimensions of the device are 3,5 x 138 x 95 mm, weight without base - 208 g, with it - 290 g. In addition to the base, the kit includes two cables 500 and 15 cm long for connecting to it and a USB cable 200 m long for connecting to a PC .
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