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Digital integrated circuits II<br />

There’s a couple of points to note about this JK-type bistable<br />

symbol:<br />

• operations take place on the falling edge of the applied<br />

clock pulse;<br />

• the last row of the function table shows a bistable<br />

operation known as toggling — in which the output<br />

state changes from whatever state it is, to the other<br />

state. This, you will of course remember — is how the<br />

T-type bistable of Figure 11.12 is created.<br />

And now the time has come...<br />

So with this (fairly detailed) look at digital integrated circuits<br />

and the electronic logic that they comprise, thus ends our<br />

foray into the enjoyable world of electronics. You may feel<br />

as though you’ve learned a lot in the pages of this book and<br />

I trust you’ve had a good time in the process, but hopefully<br />

this is just the beginning of enjoyable times ahead.<br />

Electronics is a much larger area than you’ve seen here, and<br />

there’s much more to discover and much more to do. Indeed,<br />

you could spend literally years reading about electronics, and<br />

designing or building projects, and you still mightn’t know<br />

it all but at least you are on the right track now — you’re<br />

starting electronics…<br />

… though just in case you think you already know it all<br />

— check out the quiz over the page!<br />

265

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