Voltage controlled duty cycle circuit composed of 555

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The voltage control duty cycle circuit composed of 555 is shown in the figure. In an automatic control system, in some cases, a change in voltage is required to control the duty cycle of the pulse wave. This circuit consists of 555 and R1, C1, and VT1 to form an astable multivibrator. The charging circuit is R1, VT1, and C1. The discharge circuit consists of discharge tubes inside C1 and 555. VT1 acts as a charging constant current source for C1, which makes the charging sawtooth voltage wave of C1 have a good linearity.