The 20K variable resistor is used to set a required level of heat. The circuit is also using a 10K NTC thermistor as a heat sensor, and some other passive components. LM311 IC is used here in comparator mode. The schematic shown below is a circuit of a heat sensor. This first circuit is a light sensor and the second is dark sensor circuit. There are two circuits show below using the LM741 IC. If you want to alternate the IC with other 8 pin dip comparator ICs in case it is used in a general application then you can also use other comparator ICs like LM393, LM741, LM358 etc. Replacement / Equivalent / Other Part Numbers: Moreover the IC circuitry also consist a transistor that makes this IC ideal for many applications.Äomestically Used Electrical Goods / Electrical Appliances The maximum operating temperature of the IC is +70 centigrade and storage temperature range is from -65 centigrade to +150 centigrade. The IC can also be operated with dual supply as most of the opamp ICs operated. The IC can be operated with wide power supply range of upto 36V. One of the main features of the IC is that it can be operated with a single power supply. The IC has the capability to balance the offset and it has also strobe functionality. It requires very low input current at its bias and offset. The internal circuitry is having some of very good features. LM311 is a voltage comparator op amp IC available in many packages. Output stage can be controlled with this pin. This pin should be used to get rid of offset voltage Out is protected with short circuit for upto 10 seconds.The IC can easily be used with TTL and MOS circuits.The input and output of the IC can be isolated from circuit’s ground.It can drive load up to 50V with 50 miliampere.Can be operated with wide supply voltages.Can be operated with dual and single power supply.LM311 requires very low input current at bias and offset.LM311 IC Features / Technical Specifications:
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