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555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

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555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Circuit Description

The circuit is a variable duty cycle, constant frequency, astable multivibrator using the 555 timer. Diodes Dchg and Ddchg separate the charge and discharge paths respectively. They also create a practically symmetrical voltage loss along the two paths. Potentiometer Rdcadj adjusts the duty cycle with slight effect on frequency. When the potentiometer is adjusted the resistance subtracted from one path is added to the other path. Thus the mark and space time of the output can be varied while maintaining their sum almost constant. This results in variable duty cycle and constant frequency output signal.

miguelrh says:

Thank you. I played with the values a bit to get a frequency of >100kHz to drive a MOSFET for a DC-DC converter. It worked wonderfully.

7 years ago

GGoodwin says:

I appreciate your expression of gratitude, thanks too.

6 years, 7 months ago

billelnaruto says:

good circuit

6 years, 1 month ago

helcio says:

There is an excellent tutorial about this circuit in:

https://skinnyrd.com/adjust-the-duty-cycle-of-the-555-timer-without-changing-the-frequency/

5 years, 4 months ago

GGoodwin says:

Comment has been removed

5 years, 4 months ago

GGoodwin says:

Thank you for letting us know about the tutorial. I watched some portions of the video (I hoped to watch it in full some other day) and the explanation is excellent. I just have one concern about the tutorial, formulas/formulae were shown (image in Formulas in the Video section and, in the video, completion of computations at about 10:30) and notice the associated comment from username SPS.

t1 = 0.693(R1 + Rx)C1

t2 = 0.693(R2 + Ry)C1

and, consequently, T and freq would be subjected to inaccuracy due to the effect of the diodes. The extent of the inaccuracy depends on the power supply and forward voltage of the diode. The error is lower at higher power supply to diode forward voltage ratio, that is why a user named ION posted that "I get the most accurate results when I use a Schottky rectifier."

Note:
In the formulas/formulae shown above, component designations are from the tutorial not from my circuit.

I wanted to create circuits which can help provide more information about this circuit but I have some other priorities. These supplemental circuits are currently in "template" form and I don't know when I can finish them.

5 years, 4 months ago

GGoodwin says:

@billelnaruto

Good comment :-). Thanks, and sorry for the very long delay of my response. I believe, due to circumstances, this is going to be my usual apology. To substantiate, I already spotted the typographical error in CIRCUIT DESCRIPTION after I posted my reply to the previous comment but only now, after 14 months, did I caught this splendid opportunity to change cycly to cycle.

5 years, 4 months ago

nano9000mv says:

hola es mi primera ves que ocupo este programa y si alguien me puede ayudar a entender el programa o como funciona.
tengo que hacer un semafaro con dos luces led que prenda y apagar, como un semafaro real

5 years, 2 months ago

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Creator

GGoodwin

1116 Circuits

Date Created

7 years, 7 months ago

Last Modified

5 years, 4 months ago

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555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Circuit Description

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High frequency PWM with NE555

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555 Variable Duty Cycle, Variable Frequency Circuit

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555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle 200Hz

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555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Mobile Incoming Call Indicator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Multivibrador Astável 555 - Duty Cycle Variável, Frequência Constante (PWM)

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator icarmon6

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Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

555 Astable 1 Hz

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Maquinas eletricas

Astable Multivibrator using 555 Timer

555 Variable Duty Cycle, Constant Frequency Astable Multivibrator

Copy of 555 Variable Duty Cycle, Constant Frequency Astable Multivibrator