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basic range sensor (URGENT) by using Opamps not timers

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elvinme

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i am required to design a range sensor by using opamps, any kind of capacitors,resistors,LEDs . Timers are not allowed to be used. Also only DC voltage sorce allowed it should not be more than 3 DC sorce. th basic requirement are that:
design a circuit that measures 0-60cm diistance and by the help of 4 LEDs visualize it.
0-20cm 1 LED is on. 20-40 2 LEDs an so on.
TSOP1138(TK 19) allowed to use of course
 
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You could look at the bottom of this page and see what almula learned when he posted the same homework assignment.
 
timers are used in that project. but we are not allowed to use them.olny opamp and TK19 should be used.
 
Yes, I run across almula in the chat room seeking for help. But he seemed quite unable to explain the problem more or less precisely.
 
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