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L38, Electronics Toss Circuit

The circuit given here can be used for tossing head or tail. There are many games, where a tossing is required to start the game and this circuit can be used in all such instances.

The circuit uses two ICs NE555 timer IC1 and 74LS76 dual JK flip flop IC2. The IC1 is configured as an astable multi-vibrator operating at 10Hz.The output of IC1 is inverted by using the transistor Q1. The collector of Q1 is connected to the pin 1 of IC2 via the push button switch S1.The IC2 is wired in toggle mode.

When push button S1 is pressed the output pins 14 and 15 of IC2 starts toggling in state. The LEDs connected to these pins also toggles (Since the frequency of toggling is 10Hz, we feel both LEDs glowing). When push button S1 is released either one of the LED remains ON indicating the head or tail.


  • IC1 = NE555, IC2 = 74LS76

  • R1 = R2 = 47K, R3 = R4 = 330 ohm,

  • R5 = 1M, R6 = R7 = 470 ohm

  • C1 = 1uf, C2 = 0.1uf

  • LEDs (Red & Blue), Push switch

  • 9volt battery


  • The circuit can be powered from 5 V DC.

  • Switch S1 is a push button switch.

  • The ICs must be mounted on holders.

  • The circuit can be assembled on a general purpose PCB.

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