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JK1 and JK2 need to initialize in opposite states, don’t they? 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. Post as a guest 74hc6.
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It means that if I wire pin 5 to Vcc I got always 10 output. For the Preset pin where you have a switch to pull it to ground, 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.
74HC76 Datasheet PDF –
Sign up or log in Sign up using Google. Home Questions Tags Users Unanswered. How do you ensure this? 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 adtasheet work as required. Thanks for your advice.
Sign up using Facebook. This is the integrated pinout: 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. If no what’s the matter of my circuit? This is my schematic very basic: Do not, ever, disconnect the VCC pin when debugging, because that breaks chips.
I’m building a simple ring counter with two jk flip-flop.