Is it possible to create a 10 us logic high signal and 40 us low then 10 us high again with 555 timer as shown below?

I wish

I have tried to change the values of R1, R2 and C1 but that process didn’t let me have a time low longer than time high.

  • \$\begingroup\$ tH must be greater than 50% with basic 555 circuit. \$\endgroup\$ Nov 28, 2022 at 17:36
  • \$\begingroup\$ @StainlessSteelRat ye i figured that so how can i add a delay in this case then? \$\endgroup\$ Nov 28, 2022 at 17:38
  • 2
    \$\begingroup\$ You could use 2. First giving 50μs as a multivibrator and second as a 10μs one shot. But 1 will not do as you want. \$\endgroup\$ Nov 28, 2022 at 17:40
  • 7
    \$\begingroup\$ You can add an extra transistor for inverting the signal. \$\endgroup\$ Nov 28, 2022 at 17:49
  • \$\begingroup\$ As @aconcernedcitizen says use a npn, base resistor and collector resistor to flip polarity with 80% duty cycle. \$\endgroup\$ Nov 28, 2022 at 19:18

1 Answer 1


Not the best solution, but this can also be useful ...

R2 & R3 are the two parts of a potmeter, it adjusts the duty cycle.

enter image description here


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