Version 2
    Toggle Sign Using an SR Flip-Flop

    The Learning Circuit | element14 presents |  Project Videos



    In the last lesson episode, Karen explored SR and JK flip flops. In this episode, Karen uses an SR Flip Flop with Preset and Clear to demonstrate how the inputs affect the outputs. Using that circuit and no additional parts, Karen shows how to use that flip flop to create a toggle circuit. The final project shows how the circuit can be used to create a  Yes/No, Either/Or sign.This circuit is just the beginning. Adding a 555 timer or sensors instead of a button opens the door to the many different ways this circuit can be useful in an everyday item.


    Bill of Material:


    Product NameManufacturerQuantityBuy KitBuy Kit
    Super Bright White 5mm LED (25 pack)ADAFRUIT2Buy NowBuy Now
    Red LED, Through Hole, 5mm, 20 mA, 2.1 VLED Technology1Buy NowBuy Now
    LED, Green, Through Hole, T-3 (10mm), 20 mA, 2.2 V, 568 nmKingbright1Buy NowBuy Now
    Flip-Flop, 74LS74, D, 13 ns, 33 MHz, 16 mA, DIPTEXAS INSTRUMENTS1Buy NowBuy Now
    Prototype Board, Phenolic, 1.6 mm, 45 mm, 91 mm, (2) smallMulticomp1Buy NowBuy Now
    Rocker Switch, On-Off, SPST, PanelZF ELECTRONICS1Buy NowBuy Now
    Through Hole Resistor, 10 kohm, 250 mW, ± 1%TE Connectivity4Buy NowBuy Now
    Through Hole Resistor, 100 ohmMulticomp2Buy NowBuy Now
    Through Hole Resistor, 220 ohm, 400 mW, ± 1%Vishay2Buy NowBuy Now
    Tactile Switch, 6mm, Black, Tall, 12 VDC, 50mAE-switch4Buy NowBuy Now
    Tactile Switch, 12mm, Black, Tall, 24 VDC, 50mAAlcoswitch1Buy NowBuy Now
    Hook-up Wire Spool Set - 22AWG Solid Core - 6 x 25 ftAdafruit1Buy NowBuy Now
    9V battery snap, flexibleMulticomp1Buy NowBuy Now
    Battery, 9 V, PP3, AlkalinePro Elec1Buy NowBuy Now
    Linear Voltage Regulator, 7805, Fixed, 10V To 35V In, 5V And 1A Out, TO-220-3ON SEMICONDUCTOR1Buy NowBuy Now

    Additional Parts:


    Product Name

    Super Bright White 5mm LED (25 pack) - PRODUCT ID: 754 -