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Make: More Electronics
book

Make: More Electronics

by Charles Platt
April 2014
Beginner to intermediate content levelBeginner to intermediate
392 pages
14h 57m
English
Make: Community
Content preview from Make: More Electronics

Chapter 10. Experiment 10: From Sound to Light

You can now create a noise-activated LED. Figure 10-1 shows the same circuit as before, with just five components added. A photograph is included in Figure 10-2.

This op-amp test circuit will flash the LED whenever the electret microphone picks up sound of moderate intensity.
Figure 10-1. This op-amp test circuit will flash the LED whenever the electret microphone picks up sound of moderate intensity.
The circuit with a noise-activated LED, breadboarded (9V battery is not shown).
Figure 10-2. The circuit with a noise-activated LED, breadboarded (9V battery is not shown).

An LED-Transistor Combination

After the output from the LM741 passes through the coupling capacitor, it reaches the midpoint between ...

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Publisher Resources

ISBN: 9781449344030Errata PagePurchase book