What exactly is duty cycle?

Hello,

can an expert direct me what the "duty cycle" is really?

for example what it means for a 555 oscillator at 12V 40kHz of frequency and how can i measure it and how can i measure the SQUARE wave of 555?

another question is if i have an extra voltage on the output of a 555(pin3) how can reduce it?(a serial OR parallel resistor)?

duty cycle

duty cicle for a square pulse is the ratio of ton / T
For a sinusoidal wave is the ratio of time of the positive wave to the total period.

T = ton + toff
When ton and toff are equal the duty cycle is 50%.

Re: duty cycle

To reduce the output voltage use a resistor connected in series, or, much better solution, proper 2-resistor voltage divider .. see picture below ..

Regrads,
IanP

duty cycle

duty cycle - using a scope (there should be a duty cycle function) , Ton/(Ton+Toff)

use a voltage divider

Re: duty cycle

Duty cycle for clock is positive on time /positve off time

Re: duty cycle

Duty Cycle Ratio is the Ratio of the Pulse Width of the Signal.

Say the Pulse of a 12V is On (Ton) for 5ms and off (Toff) for 5ms. The Duty Cycle Ratio is 5ms / 10ms = 0.5

where 10ms = Ton + Toff <===== which is the period

hope this helps you.

duty cycle

In grneral "Duty cycle" or in an other word "The cycle of duty" means the potion of time which the device do the job devided by the total time which is the (On time + Off time) or cycle time of the job which is a periodic function or operation.

duty cycle

if duty cycle is exactly 50%, then wave is symmetrical or if it is not 50% it is unsymmetrical wave..

Re: duty cycle

Duty cycle = t / T
where t = duration of ON TIME , and T = Total period of a cycle(ON TIME + OFF TIME).
ie duty cycle -> the duration of the pulse(non zero) in a pulse period.

duty cycle

In telecommunication and electronics, the term duty cycle has the following meanings:
The duty cycle D is defined as the ratio between the pulse duration and the period (T) of a rectangular waveform
Enlarge
The duty cycle D is defined as the ratio between the pulse duration and the period (T) of a rectangular waveform

* In a periodic phenomenon, the ratio of the duration of the phenomenon in a given period to the period.

duty cycle = \frac{\tau}{T} \

where

D is the duration that the function is non-zero
Τ is the period of the function.

For example, in an ideal pulse train (one having rectangular pulses), the duty cycle is the pulse duration divided by the pulse period. For a pulse train in which the pulse duration is 1 μs and the pulse period is 4 μs, the duty cycle is 0.25.

For another example, for a piece of electrical equipment, like an electric motor, the period for which it may be operated without deleterious effects, such as from overheating.

* The ratio of (a) the sum of all pulse durations during a specified period of continuous operation to (b) the total specified period of operation.

* In a continuously variable slope delta (CVSD) modulation converter, the mean proportion of binary "1" digits at the converter output in which each "1" indicates a run of a specified number of consecutive bits of the same polarity in the digital output signal.


Pulse-width modulation (PWM) is used in some music synthesizers to vary the duty-cycle of an oscillator during the performance, which has a subtle effect on the tone colors obtained.