The following course must be completed previously: MATH 205 (Cegep Mathematics 203).ĭescription: This course introduces Engineering students to the theory and application of ordinary differential equations. An Emitter Output Circuit is shown below.The following course must be completed previously or concurrently: MATH 204 (Cegep Mathematics 105). You can refer the other possible circuits from the LM311 datasheet (given at bottom). You can also notice that the Collector pin (pin 7) of the transistor is used for output and the emitter pin (pin 1) is grounded this type of design is called “ Collector output Circuit”, however this does not have to be the case always. When not in use the pins 5 and 6 should be shorted as shown above. Normally these pins are not used since the Input Offset itself is much better controlled. The pins 5 and 6 on the Op-amp are used to set the balance voltage if you want to manually adjust the DC-Offset voltage. You can note that the Output voltage stays high when pin 2 has higher voltage than pin 7 and vice versa. A sample circuit is shown below in which the Inverting Terminal is set to 2.5V and the Non-Inverting Terminal voltage is varied using a potentiometer. In this type, the VCC+ (pin 8) is connected to +5V supply voltage and the VCC (pin 4) is grounded to hold it at 0V potential. For now let’s concentrate on the +5V supply voltage circuit since this is the most used design for digital circuits. The LM311 can work on a Single supply voltage or in a dual supply mode. If the voltage at the Non-Inverting Terminal (pin 2) is higher than the Inverting Terminal (pin 2), the output (pin 7) will also be high else the output will be low. Like all voltage Comparators the LM311 also has an Inverting Pin and a Non-Inverting Pin. This transistor can drive loads upto 50V and 50mA which is suitable for driving most of the TTL, MOS and RTL loads. The transistor can also make the Load to be isolated from the system ground, so if you are looking for a Voltage comparator to drive loads of these specifications then this IC might be the right choice for you. The simplified schematics of the IC is shown below: The collector and Emitter pin of this Transistor can also be controlled by the hardware, this makes it’s suitable for many applications. Any Op-Amp can be made to work as a voltage comparator, but the LM311 proves itself to be advantages by housing an Output Transistor inside its package. The LM311 Differential Comparator Op-Amp is a very old comparator IC from TI that has been used for Voltage comparisons for a long time in electronic designs. Output can be Isolated from System Ground.Can Drive most of the TTL and MOS loads.Hence capable of driving load up to 50V and 50 mA.Single supply for two op-amps enables reliable operation. LM311 Features and Technical Specifications Provide the operating voltage for the Op-Amp. This pin can be used to turn off the output stageĬollector Out – This is the Collector output of the transistor This pin can be used to turn off the DC-offset voltage This pin is connected to the ground of the system (Negative voltage can also be used) The Inverting pin is also given a fixed voltage which is compared with the (IN+) The Non-Inverting Pin of the comparator is give a variable voltage to compare Emitter Output – This is the Emitter pin of the output transistor
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