Remote_temperature_to_frequency_converter

Published:2009/7/24 2:12:00 Author:Jessie | From:SeekIC

Fig. 13-8 This circuit converts temperature (from +3°to +300°F) to a corresponding frequency (30 to 3000 Hz). The output is isolated by a 4N28. The circuit can be used to send temperature information across long transmission lines because the 4N28 output voltage can be selected, as required. The scales are adjusted by the total value of RS (12-kΩ fixed and 5-kΩ variable). In practice, when RS is set to about 14.2 kΩ, the output is 10 Hz/°F.



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