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This is my schematic very basic: Email Required, but never shown.
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. Post as a guest Name.
74HC76 Datasheet PDF
The problem is that in datashset circuit that I’m observing on my desk the ring counter only works when pin 5 Vcc is unwired. 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. 74jc76 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. Home Questions Tags Users Unanswered.
SGS Thomson Microelectronics – datasheet pdf
If no what’s the matter of my circuit? Thanks for your advice.
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. I’m building a simple ring counter with two jk flip-flop.
Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. About Preset and Clear pin I’m managing them well: JK1 and JK2 need to initialize dtaasheet opposite states, don’t they?
74HC76 Datasheet PDF –
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. Sign up using Facebook.