Running LED lights. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Running LED lights. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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The effect of "running lights" can be obtained when the lamps or LEDs alternately light up and go out and, of course, are arranged in a certain sequence. It is this effect that creates the switch, the circuit of which is shown in Fig. 5. It contains a counter, pulses on the DD2 chip. decoder DD3 and a master generator on the elements DD1.1-DD1.3.

Running LED lights

The generator pulses arriving at the counter cause a change in the logic levels at its outputs, and they, in turn, "control" the output signals of the decoder, providing a given mode for turning on and off the LEDs. The speed of light moving along the garland can be changed by selecting capacitor C1 and resistor R1.

The switch is powered by a DC source with a voltage of 12 ... 15 V through the DA1 stabilizer.

Author: A.Levashov

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