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In this case, a ohm resistor, combined with the LED voltage and the limited high output drive of the flip-flop will give you about 6 or 7 mA LED current when on.
LED does not light up, I’ve done something wrong again haven’t Datasueet Just pull it down to 0V with a single resistor! Never leave it unconnected, even if the circuit appears to work.
Caps are cheap and don’t take up much space, but the problems arising from not enough of them can be hard to diagnose. Sometimes that works, and sometimes it doesn’t. Just to show what I’m talking about, once you’ve got the circuit working, put an LED directly to ground on the flip-flop clock input, and watch what happens.
Sign up using Email and Password. Sign up using Facebook. Tie them all high or low. Sign up or log in Sign up using Google. As others have suggested, this could be a simple R-C network, or as a better option, use an SPDT change-over switch and a set-reset SR flip-flop as a de-bouncer. Always connect the GND pin. A common way to do this is with cross-connected NAND gates. Post as a guest Name.
74HC109 Datasheet PDF
Connect the cap directly to the sockets nearest the IC power and ground pins. There are exceptions, with some dtaasheet incorporating a built-in pull-up or pull-down resistor, but unless the data sheet mentions these, assume they don’t exist. I’m using an SN74HC dual j-k” flip-flop chip. Please datasyeet the following circuit: When the circuit is powered, the led turns on but does not toggle when the momentary switch is pressed and released.
I’m a complete amateur, I’ve probably gotten a million things wrong with this already. Email Required, but never shown.
digital logic – Unable to toggle SN74HC – Electrical Engineering Stack Exchange
You need a de-bouncing circuit to feed the flip-flop’s clock input. LED lights up but does not toggle. I’m trying to toggle the led forgot to add a resistor in the diagram, ah, also forgot to add a line from 5V to Vcc.
You are clocking a flip-flop directly from a switch that has not been de-bounced. In this case, it will show up as intermittent operation of the flip-flop, depending on whether or not it got an even or odd number of contacts when you press the switch.