Roulete Circuit using 555 timer and 4017
decade counter.
COMPONENTS
|
|
IC1
|
555 timer
|
IC2
|
4017 decade counter
|
SW1
|
N.O. Push Button
|
Q1
|
BC557 PNP
|
B1
|
5v battery
|
C1
|
4.7uf
|
C2
|
100nf
|
R1
|
3.3M ohms
|
R2
|
4.7M ohms
|
R3
|
10k ohms
|
R4
|
3.3M ohms
|
R5,R6,R7,R8,R9,R10,R11,R12,R13,R14
|
100 ohms
|
D1,D2,D3,D4,D5,D6,D7,D8,D9,D10
|
LED
|
Every time SW1 is pressed, LED turns on
immediately and in order. And if you let go of the SW, the light gradually
turns off randomly.
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