Make: Electronics by Charles Platt

Author:Charles Platt
Language: eng
Format: epub, mobi, pdf
Publisher: O'Reilly Media, Inc.
Published: 2011-06-15T16:00:00+00:00

Figure 4-21. These components should be added on the same breadboard below the components shown in Figure 4-14. Use the following values to test the 555 timer in its astable mode:

R1: 1K

R2: 10K

R3: 100Ω

C1: 0.047 µF ceramic or electrolytic

C2: 0.1 µF ceramic

IC2: 555 timer

Figure 4-22. This is the schematic version of the circuit shown in Figure 4-21. The component values are the same.

Theory

Inside the 555 timer: astable mode

Here’s what is happening now, illustrated in Figure 4-23. Initially, the flip-flop grounds C1 as before. But now the low voltage on the capacitor is connected from pin 7 to pin 2 through an external wire. The low voltage tells the chip to trigger itself. The flip-flop obediently flips to its “on” position and sends a positive pulse to the loudspeaker, while removing the negative voltage from pin 7.

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