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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Alarm with Battery Charger (CB16827E)
This alarm does not interrupt its operation when the power is cut. A battery is kept at a constant...
Constant current charger (CIR22155E)
The transistor of this circuit can be a BD135 or TIP31. The load current is given by resistor R1....
480 kHz Low Pass Filter (CB13564E)
We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass...