Frequency Sweep With 555 Timer




About: Maker, Seeker, Hacker, Physics and Math junkie.

555 timer stands out as the go-to IC for most of the DIY needs and hacks. I have been using the 555 timer for quite some time and boy, it is so powerful.

But, I would like to share with the community on how to transform the 555 timer from generating mere square waves of required frequency, to generating frequency sweeps.( I call it the 'Sweep Mode' )

( PC: Epof345456 )

Step 1: How Does a 555 Timer Work ?

I feel like its best to give a quick review on how the 555 timer works before we move on to the frequency sweep. This is so as to make sure we are all in the same page.

The tutorial video is one of the best ones out there to understand the 555 timer in my opinion. Please do watch it.

Step 2: The Frequency Sweep

The schematic to the circuit that I used to make the frequency has been given in the figure. It is rather pretty simple and abuses the fact that the we can control the two comparators separately.

Step 3: Video Demonstration

This is the demonstration of the working of the circuit. When the push button is pressed, the frequency sweep begins. By changing the values of C1,C2, R1 and R2, the frequency sweep range can be altered.

Have fun!



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    5 Discussions

    PHYSICS Dude

    1 year ago

    Thanks, this really helps!


    1 year ago

    The circuit in the second picture seems to be not correct. The push botton must be connected to pin 6, right?

    Tecwyn Twmffat

    2 years ago

    The noise on the video is driving my dog crazy!


    2 years ago

    I know electronics extremely well, including the 555 timer internals. It has been my career for over 40 years. But your tutorial is probably the best explanation I've seen yet covering the great little 555 timer chip. I hope a lot of newbies watch it and understand how it functions. I've built numerous projects with that chip and will be building a lot more. Great video!