Who is the fast (CB9809E)

This simple TTL circuit indicates which was the first to press one of the four pressure switches. The circuit must be powered with a voltage of 5 V.

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5V x 5 A Step-Down Regulator LM78S40 (CB14406E)
The circuit is from the 1994 National Semiconductor Linear Applications Handbook. The component used is...
Proximity alarm (CB8486E)
This circuit, which is present in other points of this website, was found in a 90s Hands On...
Pendulum Alarm or Sismograph (CB869E)
This simple circuit produces a tone when triggered by any vibration picked up by the sensor. The...