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Automatic dual output display shows

2016-12-04 01:55
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This article is automatic dual output display. The principle is simple but effective. For you to more effectively grasp this principle, we recommend that you read the text combines schematic. This circuit lights up ten bulbs sequentially, first in one direc determined and then in the opposite direction, thus giving a nice visual effect. In this circuit, gates N1 and N2 form an oscillator. The output of the oscillator as a clock for BCD up / down counter CD4510  (IC2). According to the logic state at its pin 10, the counter counts up or down. After a few operations, pin 7 is an active low pulse IC2 output reaches the ninth count. Similarly, in the countdown operation, you have to get a pulse on pin 7 will be low. The terminal count output from the pin 7, by means of the inversion gate N3 is connected to the clock pin 14 of decade counter IC3 (CD4017) configured here as a toggle switch trigger output by returning to its second quarter to the RESET pin of the pin 4 15. Therefore, the output at pin 3 of IC3 to logic 1 and logic 0 state alternately at each terminal count of IC2. Initially, pin 3 (Q0) IC3 high and the counter is finished in a few states. Reached number nine, pin 3 IC3 is lower, so IC2 starts counting down. When the counter reaches 0 to statistics, the output of the second quarter, IC3 instantly high, so will reset the pin 3 to logic 1 state, the cycle is repeated. BCD output of IC2 is connected to 110 decoder CD4028 (IC4). After the operation in a few IC2, IC4 output to rise by a logical sequence Q0 point, thereby triggering the triacs your school and light bulbs 1-10, one by one. Thereafter, the countdown operation, IC2 light bulb in reverse order, presenting a wonderful visual effect. If you are reading this first principle, the proposed Duokanjibian, grasp this principle.

Automatic Dual output Display

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