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Square-wave modulator has variable frequency and pulse width

  

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Square Wave Oscillator Circuits / Oscillator Circuits
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Monostable Circuits

The circuit in Figure 1 satisfies all these criteria. The circuit delivers a unipolar (adjustable from 0 to 12V) pulse with adjustable frequency and pulse width. The first half of a dual, retriggerable monostable multivibrator, IC1A, generates the frequency of the pulse train. The 100-k potentiometer, R1, along with R2 and C1, sets the adjustable frequency. R3, R4, and C2 set the adjustable pulse width in the second section of the multivibrator, IC1B. visit page.

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multivibrator circuit with variable frequency and duty cycle, 10 Hz-20 KHz (s...

NE555 Duty Cycle and Frequency Adjustable from icstation.com