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If no what’s the matter of my circuit?
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 74h76 J input. It means that if I wire pin 5 to Vcc I got always 10 output.
74HC76 Datasheet Renesas pdf data sheet FREE from
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Do not, ever, disconnect the VCC pin when debugging, because that breaks chips. This is the integrated pinout: Sign up using Email and Password.
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.
74HC76 Datasheet PDF Motorola => Freescale –
About Preset and Clear pin I’m managing them well: Sign up using Facebook. The problem is that in the circuit that I’m observing on my desk the 74hhc76 counter only works when pin 5 Vcc is unwired.
I initialize the first jk with 1 using a button and preset and clear pin. I’m using 74HC76 integrated that contains two jk.
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JK1 and JK2 need to initialize in opposite states, don’t they?