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Temperature range controller circuit diagram composed of 555

2015-02-06 16:56  
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Temperature range controller circuit diagram composed of 555
When the temperature falls below the lower temperature, the resistance R1 becomes larger, so that 555 ② feet is lower than the potential 1/3Vcc. The corresponding 555 sets, ③ pin outputs high level. The light-emitting diode LED2 is lit, the relay J1 is pulled in. Connect J1-3 to the heater power supply to heat. When the temperature reaches the maximum temperature. The R1 resistance becomes smaller. The potential of 555 ⑥ will be greater than feet 2/3Vcc. The ② the foot of the potential must be greater than 1/3Vcc, reset the corresponding 555, ③ pin outputs low level. The light-emitting diodes LED1 is lit, the relay J1 releases, the contact J1-3 is disconnected.