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 NXP Semiconductors


  • Electronic Toss Circuit

  • Created: Oct 06, 2014

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Summary

This project is made electronically from a conventional tossing game such as head or tail. It is a simple yet interesting project that can be constructed by anyone. It can give a random output when the push button switch is pressed. The device uses HEF4027B dual JK flip flop that features independent set-direct (SD), clear-direct (CD), clock (CP) inputs and outputs (Q, Q). Data is accepted when CP is LOW, and transferred to the output on the positive-going edge of the clock. The active HIGH asynchronous clear-direct (CD) and set-direct (SD) inputs are independent and override the J, K, and CP inputs. The outputs are buffered for best system performance.


The circuit uses NE 555 timer and HEF4027B dual JK flip flop. The timer U1 is wired as an astable multi vibrator operating at 10Hz where its output is inverted by using the transistor Q1.The collector of Q1 is connected to the pin 1CP of flip flop U2 via the push button switch S1.The U2 is wired in toggle mode. When push button S1 is pressed the output pins 1Q and 1QB of U2 starts toggling in state. The LEDs connected to these pins also toggles since the frequency of toggling is 10 Hz making both LEDs glowing. When push button S1 is released either one of the LED remains ON indicating the head or tail.


There are many games in which tossing is required in starting the game and this circuit can be used in all such instances. Such games are truth or dare, yes or no, coin toss and many more. The device can provide a random output that is both suitable and unbiased to players.

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