Toss-a-coin binary box

  
Circuit uses an astable multivibrator to vary the heads-or-tails condition, and a flip-flop to store the condition given by the multivibrator
Toss-a-coin binary box - schematic

Consequently, the circuit is wired so that the flip-flop"s state is changed once for each full cycle the multivibrator goes through to assure an absolutely even 50-50 chance of a heads or tails loss.




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