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I’m using 74HC76 integrated that contains two jk. Without a resistor in series with each LED is is likely that the corresponding Q output is being dragged down datashet a voltage that is not high enough to be recognized as a legitimate high level by the following J input.

Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. How do you ensure this? Sign up using Facebook.

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wiring – 74HC76 integrated really use Vcc pin? – Electrical Engineering Stack Exchange

The problem is that in the circuit that I’m observing on my desk the ring counter only works when pin 5 Vcc is unwired. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policydataseet our Terms of Service.

This is the integrated pinout: Thanks for your advice. If no what’s the matter of my circuit? I’ve a button that sets the starting 1 in the first jk, so I think that the problem isn’t about Preset or Clear pin.

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74HC76 Datasheet PDF

It means that if I wire pin 5 to Vcc I got always 10 output. I initialize the first jk with 1 using a button and preset and clear pin. Home Questions Tags Users Unanswered.

Email Required, but never shown. Sign up using Email and Password. I’m building a simple ring counter with two jk flip-flop. JK1 and JK2 need to initialize datssheet opposite states, don’t they?

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About Preset and Clear pin I’m managing them well: For the Preset pin where you have a switch to pull it to 74hd76, you must also have a resistor 5K – 10K to Vcc to ensure the preset pin is high when the switch is not taking it low. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. On CMOS parts, all unused inputs must be connected, directly or through a resistor, to either Vcc or ground, whichever is required to make the part work as required.

This is my schematic very basic: