Transmitter-senses triple relative-humidity figures. (Design-Ideas).(Brief Article)

From: EDN Europe | Date: October 1, 2002| Author: Tiwari, Shyam | Copyright information

THE CIRCUIT IN Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use variable resistances [R.sub.2] and [R.sub.3], respectively. Together, these two oscillators generate FSK-modulated outputs at output of [IC.sub.1B], Pin 6. The oscillator for Sensor 3 causes switching of the FSK signal at [IC.sub.2B] [IC.sub.2B]'s...

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Transmitter senses triple relative-humidity figures. (design ideas).
EDN ; THE CIRCUIT IN Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use variable resistances [R.sub.2] and [R.sub.3], respectively.
Transmitter-senses triple relative-humidity figures. (Design-Ideas).(Brief Article)
EDN Europe ; THE CIRCUIT IN Figure 1 is a triple, relative-humidity sensor and radio transmitter. Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz, respectively, at relative humidity of 50%. The gated oscillators use variable resistances [R.sub.2] and [R.sub.3], respectively.
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