Some games need to pick a random number. this circuit is a roulette with touch switch using IC4017 and IC555.
When you touch the wires, LEDs moving speed up and when release them slow down and stop on a number.
Flashing speed of LEDs depend on 1uF capacitor and time period between LEDs speed up and stopping depend on 0.47uF capacitor, so you can changes them by other value if you want to change that speed.
You can run this circuit by 5 to 12v and power consumption is very low (lower than 10mA).
Parts list:
IC4017
IC555
Transistor BC557
Capacitor 1uF
Capacitor 0.47uF
Capacitor 100nF
Resistor 3.9M (3 pcs)
Resistor 1K
Resistor 13K
Resistor 330R ohm for 5v power supply 680 ohm for 12v power supply
LEDs (10 pcs)
When you touch the wires, LEDs moving speed up and when release them slow down and stop on a number.
Flashing speed of LEDs depend on 1uF capacitor and time period between LEDs speed up and stopping depend on 0.47uF capacitor, so you can changes them by other value if you want to change that speed.
You can run this circuit by 5 to 12v and power consumption is very low (lower than 10mA).
Parts list:
IC4017
IC555
Transistor BC557
Capacitor 1uF
Capacitor 0.47uF
Capacitor 100nF
Resistor 3.9M (3 pcs)
Resistor 1K
Resistor 13K
Resistor 330R ohm for 5v power supply 680 ohm for 12v power supply
LEDs (10 pcs)
