The duty cycle adjustable square wave generator circuit composed of 555

Published:2011/7/24 1:51:00 Author:Seven | Keyword: duty cycle, square wave generator | From:SeekIC

Once the circuit was added with a voltage VDD, the oscillator would start the oscillate. When the circuit is connected, as the voltage on C can't mutate, i.e the 2-pin LEV is the earth LEV firstly, which makes 555 offset, 3-pin is in a high LEV. C charges the generator through RA and D1, the charge time is tc=0.693RAC, when the voltage on C rises to 2/3VDD, 555 is reset, 3-pin is in a low LEV, at this moment, C discharge with the help of D1, R8 and the discharge tube in 555, the discharge time is td=0.693RbC.



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