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How to Generate a Clock Signal with a 555 Timer -- The Learning Circuit 72

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How to Generate a Clock Signal with a 555 Timer

The Learning Circuit | element14 presents |  Project Videos

 

 

Karen has been digging into 555 timers for a bit now. In a previous video, she did an overview of the 3 different modes in which a 555 timer can be used. In this video, Karen goes into further detail about one of those modes: Astable. In astable mode, a 555 timer can be used as an oscillator where the output automatically switches between high and low at a consistent rate as long as the 555 timer is connected to power.This is often the most common use of a 555 timer as it can be used to create the clock signal for other ICs. Karen explains what is happening inside the 555 to make this work, as well as creating the circuit on a breadboard to show how it works in a practical example.

 

Bill of Material:

 

Product NameManufacturerQuantityBuy KitBuy Kit
Breadboard, MCM 60 rows, ABS, 8.5mm, 165mm x 56mmMulticomp1Buy NowBuy Now
LM555CN - Timer, Oscillator & Pulse Generator IC, TTL Compatible, Astable, Monostable, 4.5 V to 16 V, DIP-8On Semiconductor1Buy NowBuy Now
Ceramic Disc Capacitor, 0.01 µF, 100 V, ± 20%, 5 mmVishay1Buy NowBuy Now
140 Pc. Jumper Wire Kit, 22 AWG, Solid, Assorted Lengths and ColorsTwin Industries1Buy NowBuy Now
Through Hole Resistor, 220 ohm, 400 mW, ± 1%Vishay1Buy NowBuy Now
Through Hole Resistor, 1 kohm, 500 mW, ± 1%TT ELECTRONICS / WELWYN2Buy NowBuy Now
Red LED, Through Hole, 5mm, 20 mA, 2.1 VLED TECHNOLOGY1Buy NowBuy Now
Tactile Switch, 12mm, Yellow, Top Actuated, Through Hole, Round Button, 24 VDC, 50mAOmron1Buy NowBuy Now
Tactile Switch, 12mm, Red, 12 VDC, 50mAMulticomp1Buy NowBuy Now

 

Additional Parts:

 

Product Name
Desktop Power Supply

 



Parents

  • Fantastic demonstration of the internal workings of a 555 timer Karen. Great work!!! I've been kicking around the electronics industry for about 30 years and don't ever recall anyone giving such concise and professional example of the popular timer.

     

    As for the comments on the screwdriver, let's be realist people. The circuit was off. The circuit is very low voltage. The presenter is clearly a very intelligent person. Simply no harm done and it's not really an issue.

     

    Regards

    Darb.

Comment

  • Fantastic demonstration of the internal workings of a 555 timer Karen. Great work!!! I've been kicking around the electronics industry for about 30 years and don't ever recall anyone giving such concise and professional example of the popular timer.

     

    As for the comments on the screwdriver, let's be realist people. The circuit was off. The circuit is very low voltage. The presenter is clearly a very intelligent person. Simply no harm done and it's not really an issue.

     

    Regards

    Darb.

Children