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A small chase simple, but easy to make and can be fun.
An oscillator 555 provides the clock signal necessary for the progression of the counter IC2. The frequency can be changed by P1, which will result in a more or less rapid scrolling diodes. The counter used is a classic of the genre, namely a 4017 meter by 10-10 decoded outputs. This means that the various outputs S0 to S9 successively pass 1, one at a time. It does not need more to turn each of the 10 LED diodes. We will notice the single common current limiting resistor of the diodes. Can afford this economy, only one diode is lit at a given time.
R1 47 KR
R3 270 R
P1 470 KR / HOR
C1 0.47MF LCC
C2 0.22MF LCC
L1 à L10 Leds
ACHIEVEMENT AND SETTINGS
Clear lime flat side notches of the PCB. Place the straps, the support of IC 1 and IC 2, R and C, P1 and finally aligned and diodes in the right direction. Adjust the height of the LEDs so they are flush with the housing closed. The switch is mounted on the left side of the lower shell.
The upper shell is pierced holes 10 of the LEDs and P1 adjusting hole.
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