Circuit improves first-event detector

Posted on Jan 27, 2013

The circuits in Figure 1 have certain advantages over those in a previous Design Idea (Reference 1). The first-event detector with autoreset (Figure 1a) consists of N sets of monostable multivibrators, using 4001 logic circuits with LEDs attached. After any player (1 through N) presses a pushbutton, the corresponding monostable multivibrator switches on, and its associated LED lights.

The voltage at Point A changes to a level of nearly 2V (the forward voltage of the LED). After that instant, no other player can change the situation by pressing a pushbutton, because, to switch, the monostable multivibrators need a voltage exceeding 4V.

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