Esp tester
7400, 7476

Do you believe in ESP (extrasensory perception)?

Before you answer, why not investigate the subject a little more using this Project?

To use this Project, turn power to ON. Press the Key and hold it down for a few seconds.

Make a guess as to which LED (1, 2, 3, or 4) will light up. Then release the Key. Were you right?

Try this 100 times, keeping a record of your guess and the actual result. You should have no trouble by now recognizing the different sections that make up this Project.

The multivibrator feeds its output into the flip-flops, which together make up a counter circuit. The output of the flip-flops go to the four NAND gates, which are connected to the four LEDs. The four NANDs make up what is known as a decoder. Can you guess how it got this name? (Do you suppose it could have anything with to do with "decoding" the output of the counter?)

What kind of results did you get when you tried the experiment 100 times?

If the circuit is truly random, each of the four LEDs should have lit 25 times each. Don't be surprised if some lit more often than others; this is normal for only 100 times. How often were you able to guess which LED was going to be lit?

Sheer luck would let you guess correctly about 20 or 30 times. You should not decide you have ESP until you can correctly guess 50 out of each 100 several tests.

Ask librarian for some good books about ESP. Read some of these books before making a final decision on whether you have ESP!







Recherche personnalisée