Voltage / frequency conversion circuit composed of μA709

Published:2011/7/7 6:40:00 Author:Lucas | Keyword: Voltage conversion, frequency conversion | From:SeekIC

Al integrates the input voltage Ui, and the Schmitt circuit is connected to Al to switch output level and make VT1 saturated conduction. As VTl emitter is clamped by VDZ IN 9V, therefore, VTl collector potential is approximately-9V. Al makes reverse integeration on the voltage, then the output changes from negative to positive, and the time constant is determined by R2 and Cl. If over voltage of Al output is not sensitive, VTl closes again, Al integrates the input voltage again. The circuit swicthes +1 to + lOV input voltage into 0.1 to lkHZ frequency pulse signal.



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