Rapid LED fire (option t2). Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Rapid LED fire (option 2). Encyclopedia of radio electronics and electrical engineering

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

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As I promised, we continue to consider circuits that allow you to implement the effect of a running light on various lighting devices - not only LEDs, as we found out last time.

So, the following scheme is obtained from the first by adding another IE8 counter and a heel of details. And as a result, we get not 10, but already 18 outputs and the possibility of further scaling.

We look at the diagram

(click to enlarge)

We are not afraid - it only seems scary at first, but in fact there is nothing complicated about it. The master oscillator remained the same - on the timer 555 or KR1006VI1 - I didn’t even change the frequency. What's added? Another counter K561IE8 was added and another functional component of the circuit appeared - two logical keys "AND". The first one is D1, D4, R3 and the second one is D2, D3, R2.

Let's see how it all works now.

When the power is turned on, the counters DD4 and DD3 are reset through the RC chain R2C3. On the 3rd output of the microcircuits, a logical 1 is formed - a high level, and on all other outputs 0 - a low level. Therefore, the pulses from the generator pass through the first logical key to DD3, and the counter starts to switch. After the counter reaches the value "10", 11 its output is set to 1, and through the second logical key, the pulses begin to flow to the counter DD2. And since the first pulse pin 3 DD2 switches to "0", then pulses can no longer be sent to DD3.

After DD2 recalculates its 10 pulses, it will again switch output 3 to a logic 1 state and the pulses will again doomedly climb onto DD3. And so on, until the power is turned off.

As in the previous circuit, if it is necessary to connect a larger load, we use buffer transistors.

In the next part, I will tell you how to make a running light on ... 100 LEDs with the same number of microcircuits! Already scared? Fear not, the scheme is no more complicated than this one. Even easier!

Publication: radiokot.ru, cxem.net

See other articles Section Color and music settings.

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