The oscillator circuit with the independent adjustable charging and discharging time

Published:2011/5/25 19:03:00 Author:Christina | Keyword: oscillator, circuit, independent adjustable, charging, discharging, time | From:SeekIC

As the figure shows, the adjustment of common 555 multivibrator's charging and discharging time will influence each other. This circuit uses the mirror current source mode to keep the independence of the capacitance C's charging loop and discharging loop, and this circuit ensures the linearity of the charging and discharging. At the beginning, the output is the high level, VT5, VT2 and VT1 conduct, C is charged by VT1's constant-current, when VT1 has the 2/3VDD threshold level, 555 sets, pin-3 has the low level, and VT5 cuts off. C is discharged by the VT3 and IC's discharging tube, when the voltage of C is 1/3VDD, 555 sets. This cycle goes round and round to form the oscillation.



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