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555 Digital temperature sensor header circuit

2015-02-01 07:47  
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555 Digital temperature sensor header circuit
As shown in Figure 7-33, the sensor header consists of two 1N914 diodes and a multivibrator composed of 555 and other components. Diode D is used as a part of discharging loop of 555 oscillator, the oscillation frequency changes proportionally with temperature and the impedance of the diode. The oscillation pulse output by 555 and then sent to the frequency counter to count, to reflect the changes of temperature.