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The adjustable symmetric triangular wave generator(NE555)

2015-02-04 16:44  
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The adjustable symmetric triangular wave generator(NE555)
In the circuit, the timer NE555 forms a triangular wave generator, whose working frequency can reach 100KHz or so. The transistors Q1 and Q2 in the figure form a switch constant current power supply whose state is controlled by Q3. When Q3 is conducting, the collector electrode is in the low LEV, at the moment, Q1 is conducting and charging the capacitor C with the constant current of i1, the voltage on the two terminals of C is a linear slope wave. When the two terminals of capacitor C are in a voltage of 2E/3 (the high trigger LEV of the timer), the 3-pin of the timer is in a low LEV, Q3 is blocked and the collecting electrode is in a high LEV.