Logic level by NE555 and MOSFET interface circuit

Published:2011/6/9 21:20:00 Author:John | Keyword: Logic level, MOSFET interface | From:SeekIC

In the circuit, NE555 is the non-steady-state multivibrator with oscillation frequency of 70KHz. Control input signals by reset pin (pin 4) on / off controls its state of oscillation. When pin 4 inputs high electricity, the oscillator starts to work. When pin 4 inputs high electricity, the oscillation stops. Output of NE555’s pin 3 provides input voltage for dual-voltage rectifier circuit composed of VD1, VD2, C3 and C4. And the output of dual-voltage rectifier circuit is 8•5V. Digital logic control signal is added to NE555’s reset pin (pin 4) through the optical coupler 4N35. The optical coupler would do electrical isolation between the digital logic control signal and the high load.



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