Make by Charles Platt

Author:Charles Platt
Language: eng
Format: epub
Publisher: Maker Media, Inc
Published: 2015-08-27T16:00:00+00:00

Draw a schematic and make sure that you understand it.

Modify it to fit the pattern of conductors on a breadboard.

Install components on the breadboard and test the basic functions.

Modify or enhance the circuit, and retest.

Transfer to perforated board, test, and trace faults if necessary.

Add switches, buttons, a power jack, and plugs or sockets to connect the circuit with the outside world.

Mount everything in a box (and add labeling).

Experiment 19: Reflex Tester

Because the 555 timer can run at thousands of cycles per second, you can use it to measure human reflexes. You can compete with friends to see who has the fastest response—and note how your response changes depending on your mood, the time of day, or how much sleep you got last night.

This circuit is not conceptually difficult, but requires quite a lot of wiring, and will only just fit on a breadboard that has 60 rows of holes (or more). Still, it can be tested in sections, like the circuit in Experiment 18. If you avoid making errors, the whole project can be assembled in a couple of hours.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.