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Blinking LED Lab David Luong Herrick Chang. Recall Capacitor Flash in disposable camera.

Published byLaura Heath Modified over 8 years ago

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Presentation on theme: "Blinking LED Lab David Luong Herrick Chang. Recall Capacitor Flash in disposable camera."— Presentation transcript:

1 Blinking LED Lab David Luong Herrick Chang

2 Recall Capacitor Flash in disposable camera

3 Blinking LED Charging and discharging capacitor How fast this happens depends on the R*C value

4 Your Lab Today To set the blinking rate of a LED light by changing resistances in a RC circuit

5 Materials Resistor Capacitor 555 Timer Chip Battery (6 VDC) LED POTentiometer (variable resistor with 3 legs) Direction matters! Multimeter Stopwatch -+-+ -+-+

6 Build Your Circuit Do not connect this leg! Measure using multimeter resistance in Ohm and capacitance values in Farad Place your components on the breadboard Direction of LED and Capacitor matters! Potentiometer (fold one leg and do not connect)

7 Analyze your Circuit Make R pot = 100kOhm Connect battery Measure blinks/sec Calculate blinks/sec Disconnect battery Repeat for R pot = 75, 50, and 25kOhm

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