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wiring – 74HC76 integrated really use Vcc pin? – Electrical Engineering Stack Exchange
This is my schematic very basic: Sign up using Email and Password. 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.
Without a resistor in series with each LED is is likely that the corresponding Q output is being dragged down to a voltage that is not high enough to be recognized as a legitimate high level by the following J input. If no what’s the matter of my circuit?
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Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. It means that if I wire pin 5 to Vcc I got always 10 output. I’ve a button that sets the starting 1 in the first jk, so I think that the problem isn’t about 74nc76 or Clear pin.
Sign up or log datwsheet Sign up using Google. Thanks for your advice. How do you ensure this? Email Required, but never shown. About Preset and Clear pin I’m managing them well: 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.
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