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The sawtooth wave generating circuit of 555

2015-01-30 03:49  
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The sawtooth wave generating circuit of 555
The sawtooth wave generating circuit of 555
In the figure is the sawtooth wave generating circuit of 555. The circuit is a audio sawtooth wave generator which is irrelevant to temperature, whose linearity is within 1%. It uses the timer NE555 to make a non-steady multi-oscillator. The capacitor C1 is charged by the power supply(+5V) with the help of R1,R2 and R3, and discharge is done through R3 and the transistor channel inside NE555, therefore, the sawtooth wave is generated on 7-pin of NE555. The wave is output by the emitter Q1(MPS-AB) of the Darlington transistor. The output of Q1 is reacted to the upper part of R2 by C2.