The auto detecting and heating circuit of 555 minimum temperature

Published:2011/5/29 20:53:00 Author:Borg | Keyword: detecting and heating circuit, minimum temperature | From:SeekIC

The circuit controls temperature in a digital way, which includes four sub-circuits, they are time-base oscillation circuit, counting circuit, relay control circuit and auto monitoring circuit, see as Figure 12-39. Figure 12-39 The auto detecting and heating circuit of the minimum temperature The time-based oscillator consists of IC1-4(1/2*556) and thermistor of RT1,RP1,R1 and C1,etc, RT is made of negative temperature coefficient thermistors, and the frequency of the multi-resonate oscillator is: f=1.44/(R1+RP1+2RT)C1 The frequency of the parameter in the figure depends on RT and RP1,and the selected resistance of the thermistor is about RT=10KΩ.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/The_auto_detecting_and_heating_circuit_of_555_minimum_temperature.html

Print this Page | Comments | Reading(3)