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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