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Whenever the analog voltage is above the threshold of A1 the counter will count up so that the DAC outputincreases to follow the analog voltage Whenever the analog voltage is below the threshold of A2 the counter will count down to make the DAC follow the analog voltage. When the analog voltage is between the two thresholds the outputs of Al and A2 will be high and the counter will be stopped The circuit here has an analog input range of _+ 10V Other ranges may be accommodated by suitable choice of input resistors. Note that in this circuit the mode input is tied low. This causes the counter to stop when full-scale or zero is reached. i.e. when the analog input exceeds plus or minus full-scale Without this feature the counter would simply cycle continuously.
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