Izvor/Source:
https://bestengineeringproject...emperature-controller-circuit/
Sa bestengineeringprojects.com :
"The heater is connected to the N/C of the relay, thus the heater will be ON initially. The heater starts heating the water when the temperature reaches 300C LED8 starts to glow. Gradually all the LEDs start to glow. When the temperature reaches 800C output of U4:C becomes high. This high output turns ON the relay driver transistor Q1 and as a result relay RL1 energizes. The power supply for the buzzer and heater driver relay is given through relay RL1.
When the temperature reaches 1000C output of U4:1 becomes high which further turns transistors Q2 and Q3 high. As a result, the buzzer started to sound and cut the supply of the heater.
Since the heater is OFF, the temperature of the water starts to decrease. As a result, the buzzer goes off. But the heater driving relay will be in the energized state due to the latching arrangement provided by its second pair of contacts as shown in the circuit diagram.
The heater will be ON again when the temperature of the water goes below 800C. In this way, the water temperature can be maintained automatically."
REGULACIJA Temperature i Vlažnosti - Temp & Humidity Controll - Šeme/Schematic ↓↓↓
Registrovani: 5 ( Ultrena, Bora Sonar, Texas Instruments, ubimestruja, Nebojsa Milanovic )
