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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Noise generator (CB8009E)
This circuit generates noise pulses for audio equipment probes. The circuit is from a 90’s 303...
Visible light transmitter (CB7852E)
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...
Superheteredyne MW Receiver (CB962E)
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...