Rapid LED fire (last option). Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Color and music settings

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Ufff. Finally! We have come to the final part of the story about the schemes of running lights on all sorts of microcircuits. Of course, such schemes do not end there - you can talk about them almost endlessly, inventing various circuit solutions, but at least that's enough for me - then it's up to you.

In this part, we consider two schemes.

The first scheme is an expandable LED fire.

Let's look at the diagram.

(click to enlarge)

All this happiness is built on three IPs:

DD1 - Schmidt triggers, and DD2, DD3 - 8-bit shift registers.

The master oscillator is made on the elements of the Schmidt trigger DD1.1 and DD1.2. The pulse frequency is calculated by the formula f=1/RC. Trigger DD1.3 is used to generate a reset pulse when the power is turned on, and DD1.4 to start the first shift register - so the light starts running from the first LED, and not, for example, from the tenth. As mentioned above - the circuit is expandable - that is, by connecting additional shift registers, you can increase the number of LEDs until something sticks somewhere.

This is done in the most primitive way: pins 2, 8, 9 are connected to each other, and pin 1 of each subsequent microcircuit is connected to pin 13 of the previous one. And, of course, the R4 resistor is reconnected to the 13th leg of the last microcircuit. And to make it more convenient for you to stock up on parts in the store, I will give a small plate with the values ​​\uXNUMXb\uXNUMXbof the elements that will be needed when assembling this circuit (domestic analogues of microcircuits are shown in brackets):

In this way. Finished the exercise. Let's move on to plan number two.

Scheme number two

(click to enlarge)

This scheme differs from all previous ones in that the light here runs in two directions - first from HL1 to HL16, and then back. Moreover, the frequency of this running around can be adjusted by resistor R6. A kind of Night Rider (remember, there was such an ancient series?) Effect.

The master oscillator is made on the element DD1.1. He periodically kicks the counter on DD2, and that, in turn, sets the work for the decoders DD3 and DD4, which set fire to the LEDs. And what kind of beast is drawn on DD1.2 and DD1.3? And this is just a monostable flip-flop that tells the counter which way to count - increase or decrease the output value.

That is, initially the counter counts upwards, however, when the last LED lights up and a high-level signal is applied to the trigger from the DD4 output, it switches and the counter starts to decrease the output value.

And finally, a plate with a list of necessary parts:

Well, so that all these circuits are not too dry, especially for you, we tested the latest circuit in our Laboratory, radiokot.ru/lab/controller. Everyone to the Laboratory - soldering irons are smoking there and brains are creaking! By the way, the Cat is regularly stepped on the tail there, but he still climbs to help - he is very responsive with us.

Publication: radiokot.ru, cxem.net

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