555 timer Electronic roulette wheel circuit and explanation

Posted on Feb 7, 2014

This electronic circuit is a simple version of an electronic roulette game and is based on the 4017 IC which is a 10 stage decade counter/divider. It is driven by another versatile IC 555 configured as a voltage controlled oscillator (VCO). The 555 timer is connected as an astable multivibrator. When the S1 switch is pressed, the capacitor C3 get

555 timer Electronic roulette wheel circuit and explanation
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s charged, also at this point of time a constant stable clock is fed to the 4017 IC and the LEDs at its outputs light up in a cyclic manner producing a revolving effect. Adjusting the VR1 (variable resistor ) the speed of revolving effect can be varied. When the S1 switch is released, the main supply is cut-OFF, C3 discharges and forces the freely running astable to gradually stretch and slow down the time period of its output pulses so that eventually the oscillations stop within a stipulated time. In response to these dying pulses the rotation  of the LEDs connected to the output of IC 4017 also slow down gradually and stops to select a random score marked on the board.

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