Rapid LED fire (option 1). Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music settings
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We will talk about several simple schemes that allow you to implement the world-famous effect of a running light. So here's the first diagram. Pay attention to the diagram.
In this circuit, the light will run across 10 LEDs. Two microcircuits are used.
The first - KR1006VI1 plays the role of a master oscillator and generates pulses with a frequency that depends on the value of the resistor R1 and capacitor C1. The frequency can be calculated using the formula
and with the ratings indicated on the diagram, it is equal to 15 Hertz.
From output 3 DD1, the pulses are fed to the input of the decimal counter DD2, which is played by K561IE8. With each pulse, the counter increases its state by 1 and switches the corresponding outputs. Well, the LEDs have nothing left to do, as soon as they turn on and off depending on the state of one or another output.
If it seems to you that 10 LEDs is a lot, the circuit can be shortened by tearing off the output of 15 DD2 from the common wire and screwing it to one of the counter outputs. For example, if you need to leave only 5 LEDs, then the 15th output of DD2 is connected to the 1st leg of DD2. Thus, having reached 5 units in its account, at the sixth step, the microcircuit will give a high level signal - "1" to the reset input of the counter and its value will be reset to zero.
A small annoyance of this simple circuit is that the load capacity of IE8 is very small and is 5-6 mA, therefore, the resistor R2 is of such a large value and the brightness of the LEDs may not be sufficient. To get around this ambush, you can use buffer transistors between the outputs of the counter and the LEDs.
And it looks like this:
Thus, using the transistors indicated in the diagram, we can get a current of 20-30 mA without any strain and turn on even super-bright LEDs (5-7 Cd).
Well, if you really want something very bright, you can turn on optocouplers instead of LEDs, and connect thyristors to them. And then a quick fire can be launched at least on 500-watt searchlights.
Well, that's enough for now. In the next part, we will talk about cascading the 561IE8 chip and fire on 16 and even 18 LEDs.
And by the way, the microcircuits used in this circuit have bourgeois analogues - the KR1006VI1 has a 555 microcircuit known to the whole civilization, and the K561IE8 has a CD4017, which is also quite popular. And what's really good - both cost mere pennies. Is it true.
Publication: radiokot.ru, cxem.net
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