Running lights with auto reverse. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Running lights with auto reverse. 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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This device (Fig. 1) is an improved version of the design described in A. Levashov's note "Running lights" on LEDs"in "Radio", 2000, No. 11, p. 58. Moreover, as a result of the improvement, the number of microcircuits remained the same.

Running lights with auto reverse

The machine consists of a generator made on the elements DD1.1, DD1.2, an RS-trigger on the elements DD1.3, DD1.4, a reversible counter DD2 and a decoder DD3 that controls the switching on of the HL1-HL16 LEDs. The machine is powered from a DC source with a voltage of 9 ... 15 V through an integral stabilizer DA1.

Assume that when the power is turned on by switch SA1, the trigger output (pin 10 of the DD1.3 element), and hence the counting direction control input (pin 10 of the counter DD2), is at a high logic level. As a result, the fronts of pulses of positive polarity arriving at the counting input (pin 15 DD2), the state of the counter increases by one, causing the LEDs to light up in turn.

When the counter reaches state 15, the HL16 LED will flash, the signal from output 17 of the decoder will switch the trigger to the opposite state. Now the state of the counter with each arrival of a pulse at its output 15 will decrease by one. The LEDs will alternately turn on and off in reverse order.

As soon as the counter reaches state 0, the HL1 LED will flash, and the signal from pin 1 of the decoder will switch the trigger to another state. The described process will be repeated. As a result, the LEDs light up and go out first in one direction and then in the other, creating a "running lights" light effect with automatic reversal.

With the ratings of the parts indicated in the diagram, the generator frequency is approximately equal to 5 Hz, but it is easy to change it by selecting a resistor R1 or a capacitor C1.

Author: M. Ozolin, Krasny Yar village, Tomsk region.

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Comments on the article:

Karen
Hello! I liked the running lights with auto reverse. I beg you, if possible, send a drawing for this diagram. Thanks in advance!

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