Published:2011/6/28 21:29:00 Author:qqtang | Keyword: temperature control, temperature/frequency converter | From:SeekIC
In the figure is the precise temperature control circuit of temperature/frequency converter, which consists of the temperature sensor B, multi-resonance oscillator, audio decoder and relay, etc. The oscillator consists of IC1(555), R1, C1 and the temperature sensor, whose oscillating frequency is fc=1.44/(Rl+2RB)C1. As RB changes with the temperature, so fs also changes with the temperature. The audio decoder is adopted with the audio decoding integrated circuit IC2(LM567) with phase-lock, whose central frequency is fo=1/1.1Rw1C4, by adjusting W1, fo is the frequency of setting temperature.
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