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The adjustment of duty cycle for a stable multivibrator using 555.

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harsha_jois

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Hi all.
I've got a doubt about the adjustment of duty cycle for an astable multivibrator using 555.
If you have a circuit for a timer with 1kHz please send it.
Thank you
 

bas

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Re: Astable operation

hi

here's the final circuit with all the calculations already done
it should give you a square wave of duty cycle equal 0.6
you easily change the duty cyle but it will affect the frequency
let me know if it works for you
 

Pavel_S

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Re: Astable operation

R1 should not be less than 1k

My suggestion:

R1=6.8k
R2=68k
C=10nF (0.01uF)

F=1008 Hz (for exact values of R's and C)
F=960 to 1060 (for exact value of C and 5% tolerance of R)
Duty cycle=52.4%

**broken link removed**
 

electronics_kumar

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Re: Astable operation

harsha_jois said:
Hi all.
I've got a doubt about the adjustment of duty cycle for an astable multivibrator using 555.
If you have a circuit for a timer with 1kHz please send it.
Thank you

make sure the value of T(on) and T(off) equal to each other by properly fixing R1 R2 and C
 

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