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Transcript
GCSE Electronics. Unit E1 : Discovering Electronics Secondly we can reverse the inputs to the comparator, which will also have the same effect, as shown below: +9V R1 = 5kï + _ R3 = 10kï R2 = 5kï VOUT 0V Temperature sensing Sub-system Reference Voltage Sub-system The remarkable flexibility of this circuit means that in the design of any circuit there is usually more than one correct solution, sometimes in an examination, part of the circuit is drawn for you, so that the number of correct solutions are limited, but if you are designing your own circuit, then you are free to choose whatever solution you want provided that it satisfies your own design criteria. In all of the above circuits we have not considered possible output devices that could be connected to the comparator. The output current of many comparators is limited to a range of between 30mA and 300mA. This is of no use for driving high powered output devices like motors, or solenoids. However it is capable of driving LEDs with an appropriate series resistance, to limit the voltage across the LED to approximately 2V, buzzers, and some low power lamps. 38
