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Blinking LED Lab

Blinking LED Lab. David Luong Herrick Chang. Recall. Capacitor Flash in disposable camera. Blinking LED. Charging and discharging capacitor How fast this happens depends on the R*C value. Your Lab Today. To set the blinking rate of a LED light by changing resistances in a RC circuit.

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Blinking LED Lab

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

  6. Build Your Circuit 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) Do not connect this leg!

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

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