In pulse location modification, the position of the pulse changes as a modified signal function, and the pulse width and width is always maintained. The position of each pulse varies according to the instantaneous sampling of the modified signal. To implement the pulse site modification, two integrated 555 timer circuits, one in stable mode and one in isolation mode are used.

The signal modification is applied to the first 5 pin of 555 IC, which operates in a stable mode. The output of IC 555 is a modified wave of pulse width. This PWM signal is applied as a stimulus input to the secondary 555 IC running in a one-credible mode. The position of the output of the pulses in the second integrated circuit 555 varies in response to the PWM sign, which depends on the modified signal.

The diagram of the pulse position modification using two 555 integrated circuits is shown below.

The threshold voltage for the first IC is 555, determined by the controlled voltage (modified signal) then UTL (upper threshold value) and supplied by

UTL = 2/3 VCC + VMOD

As the threshold voltage changes compared to the applied signal change, the width of the pulse changes and the delay changes. While the modified pulse width signal is applied to the secondary IC trigger, the amplitude and width of the output pulse do not change, but the position of the beat only changes.The waveforms of a generated pulse are shown below.


We know that an incredible multivibrator ensures a constant flow. A wide range of pulse trains can be built using an R1 potentiometer. The following shows the pulse generator of the circuit using the stable operating method IC 555.

Frequency modification using Multivibrator Astable

A modified frequency signal can be generated using a Multivibrator Astable. The modified signal is output to pin 5 (controlled voltage). The modified frequency circuit using a solid operating method IC 555 is shown below.

A diode is connected to a parallel with resistor R2 to produce a 50% duty cycle of a duty cycle. The sign change is applied to pin 5 by means of a high-pass filter that contains a capacitor and a resistor. Depending on the changed signal applied to pin 5, the output is the change frequency. When the voltage is changed, the voltage is high, the length of the output signal is high and when the changed voltage signal is low, the length is low. The modified wavelength and frequency of the modified signal are shown below.