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Game-show "contestant-selection" controllers aren't new. But the designs are complicated, especially as the number of inputs grows. This contestant controller is simple and expands easily. The idea is to keep arbitration to a minimum. The design has a window of opportunity so small (nanoseconds) that if two or more signals get through, you can call it a tie.

• Contestant Controller Is Simple And Easy To Expand
• Simple Circuit Turns PWM Into A Digitally Adjustable Precision Reference
• Simple Circuit Offers Single-Adjustment Tone Control