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Digital telemetry thermometer (FDD5/JDD5)
Source: InternetPublisher:D先生 Updated: 2014/06/11
Relevant key device information applied in this article:
JNA155
CD4046
AD590
FDD5
JDD5
741
CH279
transmitter circuit:
The integrated temperature sensor AD590 forms a temperature detection circuit to convert temperature changes into changes in output current. The output current of the AD590 is proportional to the measured temperature, that is, as the temperature rises, the output current increases at a constant ratio of 1μA/K. When the output current flows through RP2, a voltage drop is formed at its upper end. This voltage is amplified by the voltage amplifier and serves as the control voltage of the voltage-frequency converter. Receiving circuit:
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