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Modified humidity control

Modified humidity control
The Type NH-3 humidity sensor used in the ‘automatic air humidifier’ (July/August 1998) may be replaced by a lightdependent resistor, LDR, or a resistor with negative temperature coefficient, NTC—see diagram. There are other devices as well: the main requirement is that they can be driven by an alternating voltage, that is, that they are non-polarized.
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