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Digital telemetering thermometers FDD5 and JDD5

2014-11-17 05:47  
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Transmitter circuit: The temperature detecting circuit is composed of the temperature integrated sensor AD590, this circuit changes the temperature variation into the output current variation. AD590's output current is proportional to the measurement temperature, as the temperature increases, the output current increases with the 1μA/K constant ratio. When the output current gets through RP2, at the top of RP2 forms the voltage, and this voltage is amplified by the voltage amplifier and is used as the voltage-frequency changer's control voltage. Receiving circuit: