Two-level Temperature Switch Circuit with LM358
The two-level temperature switch measures two different temperature ranges. After that, the relay turns ON/OFF corresponding to the temperature level. Furthermore, the circuit includes IC LM358, transistors, diodes, and relays.
Working Explanation
The thermistor in the circuit detects the temperature and sends signals as INPUT to the two ICs. LM358 is a dual operational amplifier IC. Moreover, both ICs are working in their comparator mode. Additionally, both the op-amps are working in the circuit but with separate ICs. Also, attached to the IC is a 10KΩ variable resistor which is set to get the desired level of temperature.
Both ICs receive the same signal from the thermistor, then, IC compares the input signal with the pre-set value using a potentiometer. The IC whose comparator results in zero or less than the other outputs a HIGH signal. Subsequently, the transistor, attached to the latter IC, receives the weak signal and amplifies it. At last, the amplified signal activates the corresponding relay. Meanwhile, the diode keeps a check for polarity changes in the circuit.
Also, a relay has to be of the same voltage rating as that of the battery.
Application
Any electronic circuit that is to be operated at a certain temperature is attached to this switch circuit. Additionally, the circuit prevents from burning of the electronic circuits attached to it. It is because the circuit switches to the other relay immediately with the rise in temperature.
Overview: Over Heat Detector with Auto Cut-Off System using Op-Amp
In this mini electronics project, we will build a simple Over Heat Detector with Auto Cut-Off System using Dual Op-Amp IC LM358. The circuit can also be called a Heat Sensor. The circuit basically triggers an alarm or turns on the LED when the temperature of the surrounding rises and goes beyond the desired level. The circuit can help to completely shut down the working system after over heat is sensed.
The usage of the Over Heat Detector circuit is inside your PC or in your kitchen. In an oven, it is desired that does not exceed a maximum temperature and prevent anything from burning. Similarly in a cooling system for perishable foods, it is desired that the temperature does not exceed a maximum level. Heat sensor circuit or Over Heat Detector Circuit senses the heat from various electronic devices like amplifiers, computer and thus generates the warning alarm.
The circuit has an output relay. This relay can connect to any system to warn of an emergency. This could be a sound device, a light source of any other indicator. The relay can also trigger a system to disconnect the heat source. This project for the over heat detector uses a 10K NTC thermistor. NTC thermistors are often the preferred choice for temperature sensing because of their small package sizes and attractive price-performance ratios.
Two-level Temperature Switch Circuit with LM358
The two-level temperature switch measures two different temperature ranges. After that, the relay turns ON/OFF corresponding to the temperature level. Furthermore, the circuit includes IC LM358, transistors, diodes, and relays.
Working Explanation
The thermistor in the circuit detects the temperature and sends signals as INPUT to the two ICs. LM358 is a dual operational amplifier IC. Moreover, both ICs are working in their comparator mode. Additionally, both the op-amps are working in the circuit but with separate ICs. Also, attached to the IC is a 10KΩ variable resistor which is set to get the desired level of temperature.
Both ICs receive the same signal from the thermistor, then, IC compares the input signal with the pre-set value using a potentiometer. The IC whose comparator results in zero or less than the other outputs a HIGH signal. Subsequently, the transistor, attached to the latter IC, receives the weak signal and amplifies it. At last, the amplified signal activates the corresponding relay. Meanwhile, the diode keeps a check for polarity changes in the circuit.
Also, a relay has to be of the same voltage rating as that of the battery.
Application
Any electronic circuit that is to be operated at a certain temperature is attached to this switch circuit. Additionally, the circuit prevents from burning of the electronic circuits attached to it. It is because the circuit switches to the other relay immediately with the rise in temperature.
Overview: Over Heat Detector with Auto Cut-Off System using Op-Amp
In this mini electronics project, we will build a simple Over Heat Detector with Auto Cut-Off System using Dual Op-Amp IC LM358. The circuit can also be called a Heat Sensor. The circuit basically triggers an alarm or turns on the LED when the temperature of the surrounding rises and goes beyond the desired level. The circuit can help to completely shut down the working system after over heat is sensed.
The usage of the Over Heat Detector circuit is inside your PC or in your kitchen. In an oven, it is desired that does not exceed a maximum temperature and prevent anything from burning. Similarly in a cooling system for perishable foods, it is desired that the temperature does not exceed a maximum level. Heat sensor circuit or Over Heat Detector Circuit senses the heat from various electronic devices like amplifiers, computer and thus generates the warning alarm.
The circuit has an output relay. This relay can connect to any system to warn of an emergency. This could be a sound device, a light source of any other indicator. The relay can also trigger a system to disconnect the heat source. This project for the over heat detector uses a 10K NTC thermistor. NTC thermistors are often the preferred choice for temperature sensing because of their small package sizes and attractive price-performance ratios.
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