pulse generator with variable duty cycle

N1 49 pulse generator with variable duty-cycle single 4093 CMOS IC is eminently suitable for constructing a simple pulse generator. The IC con- tains four Schmitt-triggers. By adding a resistor, two diodes, a capacitor and a potentiometer, one of the four gates can be used to produce an oscillator with a set frequency and a variable duty-cycle. The pulse A which P1 was rotated. This effectively means that the pulse width varies. As far as R1 is concerned, this acts as a protective measure in case P1 is turned fully clockwise (minimum resistance). This means that the duty- cycle is not 100% variable, but, after all, a 2 ... 98% range should be perfectly acceptable! The frequency of the oscillator is dependent on the value of capacitor C1, since the sum of theeC time- duration is determined by the RC time-constant of the network consisting of capacitor C1 and resistors When the wiper of the potentiometer is R1 + Pl. in the mid position a perfectly symmetrical square- wave signal is ...