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You are here: Home / Topics / Pulse generation using 555

Pulse generation using 555

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Microcontroller › 8051 › Pulse generation using 555

  • This topic has 5 replies, 3 voices, and was last updated 7 years ago by prachin.
Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • July 13, 2015 at 6:17 am #3764
    prachin
    Participant

    Hello,

    This is Prachin Patil. I am trying to generate pulses of 38khz using IR led. For that I have used NE555P IC. I am getting pulses upto14 Khz. But above it, 555 does not give any response. Now I have conncected C=0.01uf, Ra=Rb=2.2kohm. In this case I should get pulses with frequency nearly 21 Khz but it's not happening. Is NE555P not suitable for pulse generation more than 15 khz?. Can anyone suggest me regarding same?.  If possible suggest me another IC for high frequency pulse generation. Thanks in advance.

    July 14, 2015 at 4:49 am #13066
    Vara Ashishkumar
    Participant

    Frequency Accuracy depends on Exactly matched value of Resistor.So connect potentiometer with Ra and adjust value as per your requirement.

    July 14, 2015 at 5:22 am #13069
    prachin
    Participant

    Thank you Mr. Ashish  for your valuable response.

    I have already done this with help of POT. I will try it one more time.

    July 15, 2015 at 4:16 am #13072
    prachin
    Participant

    Thank you Mr. Ashish once again.

    As per your information I tried it one more time with the help of POT at place of Ra & Rb. Now I am getting 38 Khz pulses.

    Thanks a lot.

    July 19, 2015 at 9:21 am #13081
    Ashutosh Bhatt
    Participant

    calculate values of Ra, Rb and C from equation

    f = 1.44 / (Ra + 2Rb)*C

    where f = 38 KHz

    take C = 0.01 uFd

    August 7, 2015 at 10:37 am #13153
    prachin
    Participant

    Thank you so much Mr. Bhutt for your valuable response.

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